Appendix S — ONSITE STORMWATER TREATMENT SYSTEMS

(Matrix Adoption Tables are non-regulatory, intended only as an aid to the code user. See Chapter 1 for state agency authority and building applications.)

This state agency does not adopt sections identified with the following symbol: The Office of the State Fire Marshal’s adoption of this chapter or individual sections is applicable to structures regulated by other state agencies pursuant to Section 1.11.0.

548 2025 CALIFORNIA PLUMBING CODE

APPENDIX S

ONSITE STORMWATER TREATMENT SYSTEMS

The provisions contained in this appendix are not mandatory unless specifically adopted by a state agency, or referenced in the adopting ordinance.

S 101.0 Onsite Stormwater Treatment Systems. S 101.1 General. The provisions of this appendix shall apply to the water quality, monitoring, design, construction, alteration, repair, and operation requirements of onsite stormwater treatment systems for nonpotable use. S 101.2 Allowable Use of Stormwater. Where approved or required by the Authority Having Jurisdiction, stormwater shall be permitted to be used in lieu of potable water for uses such as, but not limited to, water closets, urinals, clothes washers, ornamental plant irrigation, and dust suppression. S 101.3 Design and Construction Requirements. Onsite stormwater treatment systems shall meet the design, construction, and performance requirements of Section S 101.3.1 or Section S 101.3.2.

S 101.3.1 Listed Stormwater Treatment Systems. Onsite stormwater treatment systems shall be listed to ARCSA/ASPE 78, installed according to the manufacturer's instructions, and commissioned in accordance with Section S 101.13.

S 101.3.2 Alternative Design Systems. Where approved by the Authority Having Jurisdiction, onsite stormwater treatment systems for residential and commercial applications shall comply with the provisions of Sections S 101.4 through Section S 101.15. S 101.4 Permit. It shall be unlawful for any person to construct, install, alter, or cause to be constructed, installed, or altered any stormwater treatment system in a building or on a premise without first obtaining a permit to do such work from the Authority Having Jurisdiction. S 101.5 Component Identification. System components shall be properly identified as to the manufacturer. S 101.6 Material Compatibility. Stormwater treatment systems shall be constructed of materials that are compatible with the type of pipe and fitting materials, water treatment, and water conditions in the system. S 101.7 Log Reduction Targets. Stormwater treatment systems shall be designed to meet the log reduction targets as set forth in Table S 101.7. To meet the log reduction in Table S 101.7, treatment processes used in stormwater systems shall comply with Section S 101.8 for validation or be operated according to conditions approved by the Authority Having Jurisdiction.

S 101.8 Effluent Water Quality Parameters. Stormwater treatment systems shall be designed to meet the effluent water quality parameters for water closet and urinal fixture use listed in Table S 101.8.

S 101.9 Validation. Where required by the Authority Having Jurisdiction, treatment processes shall be tested to verify the pathogen reduction performance. The treatment processes shall be validated through third-party component validation or

field verification using challenge testing. The results of the third-party component validation and/or challenge testing shall be summarized in a validation report prepared by a registered design professional. The validation report shall document the treatment technology's log reduction performance, including information on the operating conditions and surrogate parameters.

TABLE S 101.7 LOG REDUCTION TARGETS FOR 10 [-4] INFECTIONS PER

PERSON PERYEAR BENCHMARKS FOR STORMWATER

TREATMENT SYSTEMS

Notes: 1 Non-food. 2 Stormwater can contain some quantity of fecal contamination. The extent of fecal contamination present will depend on site-specific conditions. The appropriate LRT to apply for a stormwater treatment system depend on the site-specific extent of likely contamination of stormwater with fecal contamination.

TABLE S 101.8

EFFLUENT WATER QUALITY PARAMETERS FOR WATER

CLOSET AND URINAL FIXTURE USE

S 101.10 Health and Safety. Potable water systems shall be protected against nonpotable water in accordance with Section 602.0 and Section 603.0 of this code.

TABLE S 101.7 LOG REDUCTION TARGETS FOR 10 [-4] INFECTIONS PER

PERSON PERYEAR BENCHMARKS FOR STORMWATER

TREATMENT SYSTEMS

Notes: 1 Non-food. 2 Stormwater can contain some quantity of fecal contamination. The extent of fecal contamination present will depend on site-specific conditions. The appropriate LRT to apply for a stormwater treatment system depend on the site-specific extent of likely contamination of stormwater with fecal contamination.

TABLE S 101.8

EFFLUENT WATER QUALITY PARAMETERS FOR WATER

CLOSET AND URINAL FIXTURE USE

APPENDIX S

S 101.11 Monitoring Requirements. Monitoring of stormwater treatment systems shall be based on the risk level in accordance with Table S 101.11(1). The parameters listed in Table S 101.11(2) shall be monitored by sensors placed in the effluent of the system and connected to a smart controller. The smart controller shall activate an alarm when the parameters in Table S 101.11(2) are outside the specifications and shall shut the system down when the alarm is not acknowledged after a period of 8 hours has elapsed. For Category 2, quarterly grab samples shall be taken out of the effluent and analyzed by an accredited lab. The sensors' accuracy and response shall be validated upon commissioning of the system by an independent third party.

TABLE S 101.11(1)

RISK LEVELS

• See Section S 101.2 for other uses approved by the Authority Having Jurisdiction.

TABLE S 101.11(2)

MONITORING PARAMETERS

S 101.12 Design and Installation. The design and installation of onsite stormwater treatment systems shall meet the requirements of Section S 101.12.1 through Section S 101.12.6.

S 101.12.1 Connections to Potable or Reclaimed (Recycled) Water Systems. Stormwater treatment systems shall have no direct connection to any potable water supply or reclaimed (recycled) water source system. Potable water or reclaimed (recycled) water shall be permitted to be used as makeup water for a stormwater treatment system provided the potable or reclaimed (recycled) water supply connection is protected by an airgap. S 101.12.2 Bypass Connection. A bypass shall be provided for the input connection to the stormwater treatment system. The bypass shall be a diverter valve normally open to the stormwater treatment system. The normally closed port of the diverter valve shall be connected directly to the storm drainage system or combined sewer system in accordance with this code.

TABLE S 101.11(1)

RISK LEVELS

• See Section S 101.2 for other uses approved by the Authority Having Jurisdiction.

S 101.12.3 Overflow Connection. Stormwater treatment overflow shall be connected directly to the storm drainage or combined sewer system in accordance with this code. The overflow shall be provided with a backwater valve at the point of connection to the storm drainage or combined sewer system. The backwater valve shall be accessible for inspection and maintenance.

S 101.12.4 Fail-Safe Mechanisms. Stormwater treatment systems shall be equipped with an automatic shutdown device of the treatment process in the event of a malfunction.

S 101.12.5 Flow Meter Totalizer. Buildings with stormwater treatment systems shall include a flow meter totalizer on the treated stormwater distribution system and a flow meter totalizer on the potable make-up water pipeline to the stormwater treatment system. S 101.12.6 Cross-Connection Inspection and Testing. A cross-connection test is required in accordance with Section 1502.0. Before the building is occupied or the system is activated, the installer shall perform the initial cross-connection test in the presence of the Authority Having Jurisdiction. The test shall be ruled successful by the Authority Having Jurisdiction before final approval is granted. S 101.13 Commissioning. Onsite stormwater treatment systems shall be commissioned in accordance with the requirements of Section S 101.13.1 through Section S 101.13.4.

S 101.13.1 Commissioning Requirements. Commissioning for stormwater treatment systems shall be included in the design and construction processes of the project. Commissioning shall be performed by a person who demonstrates competency in commissioning stormwater treatment systems as required by the Authority Having Jurisdiction. S 101.13.2 Commissioning Plan. The construction documents shall include the commissioning plan for the stormwater treatment system. The commissioning plan shall be approved by the Authority Having Jurisdiction prior to commissioning the stormwater treatment system. The commissioning plan shall include the following:

(1) General project information.

(2) Equipment to be tested, including the test methodology.

(3) Processes to be tested.

(4) Criteria or process for testing.

(5) Criteria or process for acceptance.

(6) Commissioning team contact information.

(7) Commissioning process activities, schedules, and responsibilities.

(8) Plans for the completion of functional performance testing, post construction documentation and training, and the commissioning report. S 101.13.3 Performance Testing. Performance tests shall verify that the installation and operation of the

TABLE S 101.11(2)

MONITORING PARAMETERS

550 2025 CALIFORNIA PLUMBING CODE

APPENDIX S

equipment of the stormwater treatment system is in accordance with the approved plans and specifications. The performance test report shall include the equipment tested, the testing methods utilized, and proof of proper calibration of the equipment. S 101.13.4 Commissioning Report. The commissioning report shall be submitted to the Authority Having Jurisdiction.

S 101.14 Operation and Maintenance Manual. An operation and maintenance manual shall be provided in accordance with Section 1501.6 and shall also include the following:

(1) Instructions on operating and maintaining the system, including treatment process operations, instrumentation and alarms, and chemicals storage and handling.

(2) Site equipment inventory and maintenance notes.

(3) Equipment/system warranty documentation and information.

(4) As-built design drawings.

(5) Details on training requirements and qualifications of personnel responsible for operating the system.

(6) Maintenance schedule. S 101.15 Inspection. Field inspections shall take place during and after construction while the contractor is on-site to verify that the stormwater treatment system components have been properly supplied and installed according to the plans and specifications used for installation. Record drawings shall be maintained with changes to the approved plans by the contractor and available for periodic inspection as needed.

S 102.0 Definitions.

S 102.1 General. For the purpose of this appendix, the following definitions shall apply: Challenge Test. The evaluation of a unit treatment process for pathogen log 10 reduction performance using selected surrogate or indigenous constituents. This includes a detailed technology evaluation study conducted to challenge the treatment technology over a wide range of operational conditions. Commissioning. The activities associated with bringing a new process into normal working condition. Field Verification. Performance confirmation study conducted using challenge testing, including surrogate microorganisms and/or other non-biological surrogates, usually during startup and commissioning. Log 10 Reduction. The removal of a pathogen or surrogate in a unit process expressed in log 10 units of the effluent concentration over the influent concentration (e.g., a 1-log reduction equates to 90% removal, 2-log reduction to 99% removal, 3-log reduction to 99.9% removal, and so on). Log 10 Reduction Target (LRT). The log 10 reduction target for the specified pathogen group (e.g., viruses, bacteria, or protozoa) to achieve the identified level of risk to individuals (e.g., 10 [-4] infection per year). Stormwater. Natural precipitation that has contacted a surface at grade, below grade, or above ground parking surfaces.

Surrogate. A biological, chemical, or physical parameter used to verify pathogen reductions performances. Validation Report. Report documenting the results of a challenge test conducted during field verification.

552 2025 CALIFORNIA PLUMBING CODE

USEFUL TABLES

CONVERSION TABLES

Note: The information contained in these tables are not part of this American National Standard (ANS) and have not been processed in accordance with ANSI’s requirements for an ANS. As such, these tables may contain material that has not been subjected to public review or a consensus process. In addition, they do not contain requirements necessary for conformance to the standard.

UNIT CONVERSIONS

MULTIPLY BY TO OBTAIN

Acres.........................................................................43 560 ............................Square feet (ft [2] ) Acre-feet...................................................................43 560 ............................Cubic feet (ft [3] )

Acre-feet.................................................................325 851 ............................Gallons (U. S. liquid)

Atmosphere (atm)........................................................76.0 ............................Centimeters of mercury (0°C)

Atmosphere (standard) (atm)........................................76.0 ............................Centimeters of mercury (0°C)

Atmosphere (standard) (atm)......................................33.90 ............................Feet of water (4°C)

Atmosphere (standard) (atm)......................................29.92 ............................Inches of mercury

Atmosphere (standard) (atm)..............................101.32501 ............................Kilopascals (kPa) Atmosphere (standard) (atm)......................................14.70 ............................Pounds-force/square inch (lbf/in [2] )

Barrels..............................................................................42 ............................Gallons (gal)

Barrels...................................................................158.9873 ............................Liters (L)

British thermal units (Btu)....................................1055.055 ............................Joules (J)

British thermal units/hour (Btu/h) ........................0.000293 ............................Kilowatts (kW)

British thermal units/hour (Btu/h) ..............................0.293 ............................Watts (W)

British thermal unit hour (Btu/h)..........................1.055056 ............................Kilojoules (kJ)

British thermal unit hour (Btu/h)..........................1055.056 ............................Joule (J)

British thermal units/minute (Btu/min) ......................12.97 ............................Foot pounds-force/second (ft•lbf/s)

British thermal units/minute (Btu/min) ..................0.02358 ............................Horsepower (hp) (international)

British thermal unit per hour square foot degree Fahrenheit [Btu/(h•ft [2] - °F)] .............5.678263 ............................Watt per square meter kelvin [W/(m [2] - K)]

British thermal unit inch per hour foot degree Fahrenheit [Btu•in/(h•ft•°F)] ......0.14442279 ............................Watt per meter kelvin [W/(m•K)] Candelas per square inch (cd/in [2] )................1.550003 x 10 [3] ............................Candela per square meters (cd/m [2] )

Celsius (°C)......................................................°C + 273.15 ............................Kelvin (k)

Celsius (°C)....................................................1.8 x °C + 32 ............................Fahrenheit (°F)

Centimeters (cm) ......................................................0.3937 ............................Inches (in)

Centimeters of mercury (0°C) ................................0.01316 ............................Atmosphere (standard)

Centimeters of mercury (0°C) ....................................0.446 ............................Feet of water (4°C) Centimeters of mercury (0°C) ....................................27.84 ............................Pounds-force/square feet (lbf/ft [2] ) Centimeters of mercury (0°C) ..................................0.1934 ............................Pounds-force/square inch (lbf/in [2] )

Circumference ............................................................6.283 ............................Radians (rad) Cubic feet (ft [3] ) .............................................................1728 ............................Cubic inches (in [3] ) Cubic feet (ft [3] ) ..........................................................0.0283 ............................Cubic meters (m [3] ) Cubic feet (ft [3] ) ........................................................0.03704 ............................Cubic yards (yd [3] ) Cubic feet (ft [3] ) ........................................................7.48052 ............................Gallons (U.S. liquid) (gal) Cubic feet (ft [3] ) ............................................................28.32 ............................Liters (L) Cubic feet (ft [3] ) ............................................................29.92 ............................Quarts (U.S. liquid) Cubic feet/hour (ft [3] /h)...............................................0.0283 ............................Cubic meters/hour (m [3] /h)

USEFUL TABLES

UNIT CONVERSIONS (continued)

MULTIPLY BY TO OBTAIN

Cubic feet/minute (ft [3] /min )..................................0.000472 ............................Cubic meters/second (m [3] /s) Cubic feet/minute (ft [3] /min )......................................0.1247 ............................Gallons/second Cubic feet/minute (ft [3] /min )....................................0.47194 ............................Liters/second (L/s) Cubic feet/second (ft [3] /s) ....................................646 316.89 ............................Gallons/day Cubic feet/second (ft [3] /s) .........................................448.831 ............................Gallons/minute (gpm) Cubic inches (in [3] )...............................................1.64 x 10 [-5] ............................Cubic meters (m [3] ) Cubic inches (in [3] ) ...................................................0.01639 ............................Liters (L) Cubic meters (m [3] ).....................................................264.17 ............................Gallons (U.S. liquid) Cubic yards (yd [3] ).............................................................27 ............................Cubic feet (ft [3] ) Cubic yards (yd [3] )....................................................0.76455 ............................Cubic meters (m [3] ) Cubic yards (yd [3] )......................................................201.97 ............................Gallons (U.S. liquid)

Degrees (deg)............................................................0.0174 ............................Radians (rad)

Fahrenheit (°F)...................................................(°F-32)/1.8 ............................Celsius (°C)

Feet (ft) .....................................................................0.3048 ............................Meters (m)

Feet (ft) .......................................................................304.8 ............................Millimeters (mm)

Feet of water (4°C)...................................................0.0295 ............................Atmosphere (standard) (atm)

Feet of water (4°C)...................................................0.8827 ............................Inches of mercury (0°C)

Feet of water (4°C).....................................................62.43 ............................Pounds-force/square feet

Feet of water (4°C)...................................................0.4335 ............................Pounds-force/square inch

Feet/minute (ft/min)................................................0.01667 ............................Feet/second (ft/s)

Feet/minute (ft/min)................................................0.01136 ............................Miles/hour (mi/h)

Feet/second (ft/s) ......................................................0.3048 ............................Meters/second (m/s)

Feet/second (ft/s) ......................................................0.6818 ............................Miles/hour (mi/h)

Feet/second (ft/s) ....................................................0.01136 ............................Miles/minute (mi/min) Foot lambert (fL) ..................................................3.426259 ............................Candela per square meter (cd/m [2] )

Foot pounds-force (ft•lbf)...........................................1.355 ............................Joules (J) Foot pounds-force/minute (ft•lbf/min).............2.260 x 10 [-5] ............................Kilowatts (kW) Foot pounds-force/second (ft•lbf/s)..................1.356 x 10 [-3] ............................Kilowatts (kW) Gallons (U.S. liquid) (gal).............................................231 ............................Cubic inches (in [3] ) Gallons (U.S. liquid) (gal)....................................0.003785 ............................Cubic meters (m [3] ) Gallons (U.S. liquid) (gal)........................................0.1337 ............................Cubic feet (ft [3] )

Gallons (U.S. liquid) (gal)..........................................3.785 ............................Liters (L)

Gallons (U.S. liquid) (gal).................................................4 ............................Quarts (U.S. liquid) Gallons/day...........................................................4.3 x 10 [-5] ............................Liters/second Gallons/minute (gal/min) (gpm)...............................8.0208 ............................Cubic feet/hour (ft [3] /h) Gallons/minute (gal/min) (gpm).....................0.003785412 ............................Cubic meters/minute (m [3] /min) Gallons/minute (gal/min) (gpm).............................0.00223 ............................Cubic feet/second (ft [3] /s) Gallons/minute (gal/min) (gpm).................6.309020 x 10 [-5] ............................Cubic meters/second (m [3] /s)

Gallons/minute (gal/min) (gpm).............................0.06309 ............................Liters/second (L/s)

Grains (gr) ........................................................0.00006479 ............................Kilograms (kg)

Horsepower (hp).......................................................0.7457 ............................Kilowatts (kW) Horsepower-hours............................................2.684 x 10 [+6] ............................Joules (J)

Horsepower-hours ....................................................0.7457 ............................Kilowatt-hours (kW•h)

Inch (water column at 60°F)...................................0.24884 ............................Kilopascals (kPa)

Inches (in).....................................................................2.54 ............................Centimeters (cm)

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USEFUL TABLES

UNIT CONVERSIONS (continued)

MULTIPLY BY TO OBTAIN

Inches (in).....................................................................25.4 ............................Millimeters (mm)

Inches/hour ...................................................................25.4 ............................Millimeters/hour (mm/h)

Inches of mercury (0°C).........................................0.03342 ............................Atmosphere (standard) (atm)

Inches of mercury (0°C).............................................1.133 ............................Feet of water (4°C)

Inches mercury (0°C) ...............................................3.3863 ............................Kilopascals (kPa)

Inches of mercury (0°C)...........................................0.4912 ............................Pounds-force/square inch

Inches of water (4°C)............................................0.002458 ............................Atmosphere (standard) (atm)

Inches of water (4°C)..............................................0.07356 ............................Inches of mercury (0°C)

Inches of water (4°C)..................................................5.202 ............................Pounds-force/square feet

Inches of water (4°C)..............................................0.03613 ............................Pounds-force/square inch Joules (J)...........................................................9.480 x 10 [-4] ............................British thermal units (Btus)

Joules (J)...................................................................0.7376 ............................Foot-pounds Joules (J)...........................................................2.778 x 10 [-4] ............................Watt-hours

Kelvin (K).........................................................°K - 273.15 ............................Celsius (°C)

Kilograms (kg)..........................................................2.2046 ............................Pounds (lbs) Kilograms (kg) .................................................1.102 x 10 [-3] ............................Tons (short)

Kilopascals (kPa)..................................................0.145038 ............................Pounds-force/square inch

Kilometers (km)........................................................0.6214 ............................Miles (statute)

Kilometers/hour (km/h)............................................0.6214 ............................Miles/hour (mi/h)

Kilowatts (kW) .......................................................3412.14 ............................British thermal units/hour (Btus/hour)

Kilowatts (kW) ...........................................................1.341 ............................Horsepower (hp)

Kilowatt-hours.............................................................3413 ............................British thermal units (Btus) Kilowatt-hours.................................................2.655 x 10 [+6] ............................Foot-pounds (ft•lbs) Kilowatt-hours.....................................................3.6 x 10 [+6] ............................Joules (J)

Kip (1000 lbf).......................................................4.448222 ............................Kilonewtons (kN)

Kip-foot ..................................................................1.35671 ............................Kilonewton meters (kN•m) Kips per square inch (kip/in [2] )...................................6.8947 ............................Megapascals (MPa) Lambert (la).................................................3.183099 x 10 [3] ............................Candela per square meter (cd/m [2] ) Liters (L).................................................................0.03531 ............................Cubic feet (ft [3] ) Liters (L).....................................................................61.02 ............................Cubic inches (in [3] ) Liters (L).....................................................................0.001 ............................Cubic meters (m [3] )

Liters (L)...................................................................0.2642 ............................Gallons (U.S. liquid) Lumens per square foot (lm/ft [2] ) (footcandle).......10.76391 ............................Lux (lx)

Meters (m) ..................................................................3.281 ............................Feet (ft)

Meters (m) ..................................................................39.37 ............................Inches (in)

Meters (m) ..................................................................1.094 ............................Yards

Meters/second (m/s) ...................................................3.281 ............................Feet/second (ft/s)

Meters/second (m/s) ...................................................2.237 ............................Miles/hour (mi/h)

Miles (mi) ....................................................................5280 ............................Feet (ft)

Miles (statute).............................................................1.609 ............................Kilometers (km)

Miles/hour (mi/h).............................................................88 ............................Feet/minute (ft/min)

Miles/hour (mi/h)........................................................1.467 ............................Feet/second (ft/s)

Miles/hour (mi/h)..................................................1.609344 ............................Kilometers/hour (km/h)

Miles/hour (mi/h)........................................................26.82 ............................Meters/minute (m/min)

Miles/hour (mi/h)....................................................0.44704 ............................Meters/second (m/s)

USEFUL TABLES

UNIT CONVERSIONS (continued)

MULTIPLY BY TO OBTAIN

Millimeters (mm)............................................................0.1 ............................Centimeters (cm)

Millimeters (mm)....................................................0.03937 ............................Inches (in)

Millimeters (mm)........................................................0.001 ............................Meters (m) Minutes (min).............................................2.908882 x 10 [-4] ............................Radians (rads) Ounces/square inch (oz/in [2] )..................................43.94185 ............................Kilograms/square meter (kg/m [2] )

Ounces/square feet (oz/ft [2] ) ...............................0.03051517 ............................Kilograms/square meter (kg/m [2] )

Ounces (oz).............................................................0.02834 ............................Kilograms (kg)

Ounces (oz)...........................................................29.57353 ............................Millimeters (mL)

Pints....................................................................0.4731765 ............................Liters (L)

Pound-force feet (lbf•ft) .......................................1.355818 ............................Newton meters (N•m)

Pound-force inch (lbf•in)....................................0.1129848 ............................Newton meters (N•m)

Pound-force per foot (lbf/ft) ...................................14.5939 ............................Newton meters (N•m) Pound-force per square foot (lbf/ft [2] ) ....................47.88026 ............................Pascal (Pa) Pound-force per square inch (lbf/in [2] ) .....................6.89476 ............................Kilopascals (kPa)

Pound-force per inch (lbf/in)................................175.1268 ............................Newton meters (N•m) Pounds/cubic inch (lb/in [3] )...........................2.767990 x 10 [4] ............................Kilograms/cubic meter (kg/m [3] ) Pounds/cubic yard (lb/yd [3] ) .................................0.5932764 ............................Kilograms/cubic meter (kg/m [3] )

Pounds (lb)..............................................................0.45359 ............................Kilograms (kg) Pounds/cubic foot (lb/ft [3] ) .......................................16.0184 ............................Kilograms/cubic meter (kg/m [3] )

Pounds/foot (lb/ft) ....................................................1.4881 ............................Kilograms/meters (kg/m) Pounds/square inch (lb/in [2] ).........................................703.1 ............................Kilograms-force/square meter (kg/m [2] ) Pounds/square foot (lb/ft [2] )....................................4.882427 ............................Kilograms-force/square meter (kg/m [2] )

Pounds-force (lbf).....................................................4.4482 ............................Newtons (N)

Pounds-force/square inch (psi)...............................0.06805 ............................Atmosphere (standard) (atm)

Pounds-force/square inch (psi)...................................2.307 ............................Feet of water (4°C)

Pounds-force/square inch (psi)...................................2.036 ............................Inches of mercury (0°C)

Pounds-force/square inch (psi)...............................6.89476 ............................Kilopascals (kPa) Quarts (U.S. dry) (dry qt) ...........................................67.20 ............................Cubic inches (in [3] ) Quarts (U.S. liquid) (liq qt) ........................................57.75 ............................Cubic inches (in [3] )

Quarts (liquid) ....................................................0.9463529 ............................Liters (L)

Radians (rads).............................................................57.30 ............................Degrees (deg) Seconds (s) ..................................................4.848137 x10 [-6] ............................Radians (rads) Square acre ...........................................................0.404687 ............................Square kilometers (km [2] ) Square feet (ft [2] )..............................................................144 ............................Square inches (in [2] ) Square feet (ft [2] ).........................................................0.0929 ............................Square meters (m [2] ) Square inches (in [2] )....................................................645.16 ............................Square millimeters (mm [2] ) Square inches (in [2] )................................................0.000645 ............................Square meters (m [2] ) Square meters (m [2] ) ......................................................1550 ............................Square inches (in [2] ) Square miles (mi [2] ) .........................................................640 ............................Acres Square miles (mi [2] ) ................................................2.589988 ............................Square kilometers (km [2] ) Square millimeters (mm [2] ) ................................1.550 x 10 [-3] ............................Square inches (in [2] ) Square yards (yd [2] ) .............................................................9 ............................Square feet (ft [2] ) Square yards (yd [2] ) ..............................................0.8361274 ............................Square meters (m [3] )

Temperature (°C) + 17.28 ..............................................1.8 ............................Temperature (°F) Temperature (°F) – 32 .................................................... 5 ⁄ 9 ............................Temperature (°C)

556 2025 CALIFORNIA PLUMBING CODE

USEFUL TABLES

UNIT CONVERSIONS (continued)

MULTIPLY BY TO OBTAIN

Ton-force (tonf) (2000 lbf)...................................8.896443 ............................Kilonewtons (kN)

Ton-force foot (tonf•f/ft) ........................................2.71342 ............................Kilonewton meters (kN•m) Ton-force per square foot (tonf/ft [2] ) ........................95.7605 ............................Kilopascals (kPa) Ton-force per square inch (tonf/in [2] ).......................13.7895 ............................Megapascals (MPa)

Ton (metric).................................................................1000 ............................Kilograms (kg)

Tons (long) (2240 lbs)..........................................1016.047 ............................Kilograms (kg)

Tons (short) .................................................................2000 ............................Pounds (lbs)

Watts.........................................................................3.4121 ............................British thermal units per hour (Btus/hour) Watts.................................................................1.341 x 10 [-3] ............................Horsepower (hp)

Yards (y)...................................................................0.9144 ............................Meters (m)

USEFUL TABLES

FLOW IN GALLONS PER MINUTE CONVERTED TO FIXTURE UNITS FOR

GRAVITY FLUSH TANKS AND FLUSHOMETERS

These tables may be interpolated

558 2025 CALIFORNIA PLUMBING CODE

USEFUL TABLES

AREAS AND CIRCUMFERENCES OF CIRCLES

USEFUL TABLES

FRICTION LOSS PER FOOT LENGTH

[SCHEDULE 80 PVC EXCEEDING CHART A105.1(7)]

The following formula should be used for where Schedule 80 IPS CPVC sizes 2½” through 10” exceed Chart A 105.1(7):

Head loss formula: H L = 0.2083 (100/ C ) 1.852 x Q 1.852 / d I 4.8655

Where: H L = frictional head loss (feet of water per 100 feet)

C = Hazen-Williams factor (150 for CPVC)

Q = flow rate (gal/min) d I = inside diameter of pipe (inches)

Note: head loss in feet of water per 100 feet can be multiplied by 0.4335 to obtain pressure drop in psi

Velocity formula: V W = 0.4085 Q / d I 2

Where: V W = velocity of water (feet per second)

560 2025 CALIFORNIA PLUMBING CODE

USEFUL TABLES

FLOW IN PARTLY FILLED (ONE-HALF FULL) PIPES (BASED ON MANNING’S FORMULA WITH n = .012)

SLOPE (feet/feet)

USEFUL TABLES

FLOW IN PARTLY FILLED (FULL) PIPES (BASED ON MANNING’S FORMULA WITH n = .012)

SLOPE (feet/feet)

562 2025 CALIFORNIA PLUMBING CODE

INDEX

© 2024 International Association of Plumbing and Mechanical Officials. All rights reserved. The copyright in this index is separate and distinct from the copyright in the document that it indexes. The licensing provisions set forth for the document are not applicable to this index. This index may not be reproduced in whole or in part by any means without the express written permission of IAPMO.

– A –

ABANDONED

Grease interceptors . . . . . . . . . . . . . . . . . . . . . .1014.3.7 Sewers and sewage disposal . . . . . . . . .722.0, H 1101.0 ACCESS PANELS . . . . . . . . . . . . . . . . . . . . . .317.1, 402.10

ACCESS TO

Appliances . . . . . . . . . . . . . . . . . . .507.25, 508.3, 508.4 Backwater valves . . . . . . . . . . . . . . . . . .710.6, 1101.6.4

1503.2.3, 1503.9.7 Chemical waste system piping . . . . . . . . . . . . . . . .811.4 Cleanouts . . . . . . . . . . . . . . . . . . . . . . . . . .707.8, 719.5

Drips . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1210.7.1 Emergency eyewash and shower equipment . . . . . . . . . . . . . . . . . . . . . . .416.4 Flexible connectors . . . . . . . . . . . . . . . .604.5, 1212.5.3

Flushometers . . . . . . . . . . . . . . . . . . . . . . . . . . . . .413.2

Fuel gas meters . . . . . . . . . . . . . . . .1208.7.1, E 402.4.1 Fuel gas piping . . . . . . . . . . . . . . . .1210.3.3.1, 1210.4.4 Fuel gas pressure regulators . . . . . . .1208.7.2, 1210.5.1 Fullway valves . . . . . . . . . . . . . . . . . . . . . . .606.2, 710.6 Grease interceptors . . . . . . . . . . . . . . . . . . . . . .1014.3.4 Indirect waste receptors . . . . . . . . . . . . . . . . . . . .804.1 Interceptors . . . . . . . . . . . . . . . . . . . . . .1009.3, 1009.5, 1016.4, H 901.5

Lapped flanges . . . . . . . . . . . . . . . . . . . . . . .1208.5.11.7

Manholes . . . . . . . . . . . . . . . . . . . . . . . . . . . . .H 501.12

Meters and submeters . . . . . . . . . . . . . 601.2.1, 601.2.1.1,

601.2.1.2, L 407.4 Plumbing fixtures . . . . . . . . . . . . . . . . . . . . . . . . . .402.1 Pool heaters on/off switch . . . . . . . . . . . . . .L 503.3.6(1) Rainwater storage tanks . . . . . . .1603.4, 1603.5, 1603.6, K 105.0, K 105.3.1 Septic tanks . . . . . . . . . . . . . . . . . . . . . . . . . . . .H 501.5 Shutoff valves . . . . . . . . . . . . . . . .606.3, 606.6, 1210.9,

1210.9.1, 1210.9.2,

1210.9.4, 1212.5.3,

1212.6, 1327.2,

E 403.9, E 403.13(2), E 403.13(6) Sumps . . . . . . . . . . . . . . . . . . . . . . . . . . . .710.10, 810.3

Toilet facilities . . . . . . . . . . . . . . . . . . . . . . . . . . . .422.4

Trap seal primers . . . . . . . . . . . . . . . . . . . . . . . . .1007.1 Valve and Appurtenance Access Door Sign . .1505.9.2 Vacuum pumps . . . . . . . . . . . . . . . . . . . . . . . .C 501.2.1

Valves for

nonpotable application . . . . . . . . . . . . . . . . . . .1503.9.5 Vent connectors, fuel gas . . . . . . . . . . . . . . . .509.10.11

Water meters and submeters . . . . . . . 601.2.1, 601.2.1.1,

601.2.1.2, L 407.4 Water pressure regulators and strainers . . . . . . . .608.2 ACCESSIBLE, DEFINITION . . . . . . . . . . . . . . . . . . . .203.0 ACCESSIBLE, READILY, DEFINITION . . . . . . . . . . . .203.0

ACCESSIBLE PLUMBING FACILITIES

For persons with disabilities . . . . . . . . . . . . . . . . .403.2 Protection against contact . . . . . . . . . . . . . . . . . . .403.3 Where required . . . . . . . . . . . . . . . . . . . . . . . . . . .403.1 ACCESSORY DWELLING UNIT, DEFINITION . . . . . . .203.0

ACRYLONITRILE-BUTADIENE-STYRENE

(ABS) PIPE . . . . . . . . . . . . . . . .203.0, Table 313.3, 701.2, Table 701.2, 705.1

705.9.4, 903.1, 1101.4,

1101.4.2.1, 1104.4.2.2

AIR GAPS

Backflow prevention . . . . . . 603.2, Table 603.2, 603.3.1, Table 603.3.1, 603.4.4

Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 203.0

Discharge from drinking

water treatment units . . . . . . . . . . . . . . . . . . . . . 611.2

AIR TANK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .710.11

ALTERATIONS AND REPAIRS

Fuel gas piping . . . . . . . . . . . .1203.1, 1213.1.2, 1213.4.2

Health care facilities . . . . . . . . . . . . . . . . . . . . . . .1301.5

Plumbing systems . . . . . . . . . . . . . . . . . .102.4, 301.2.5 ALTERNATE MATERIALS, DESIGN,

AND METHODS . . . . . . . . . . . . . . . . . . . . . . . . . . . .301.3

ALTERNATE WATER SOURCE

Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .203.0

For nonpotable applications . . .Chapter 15, Chapter 16 For special water features . . . . . . . . . . . . . . . . .L 406.1

Future connections . . . . . . . . . . . . . . . . . . . . .1504.9.1

Identification of piping . . . . . . . . . . . . . . . . . . . . .601.3.3 Nonpotable rainwater catchment system . . . . . . . . . . .Table 1601.5, 1602.4

Potable rainwater

catchment system . . . . . . . . . . . . . . . . . . . . . .K 102.2 ANODELESS RISER, DEFINITION . . . . . . . . . . . . . . .203.0

APPLIANCES

Automatically operated . . . . . . . . . . . .509.3.4, 509.5.7.1 Categorized vent diameter/area, definition . . . . . . . . . . . . . . . . . .203.0 Connections to building fuel gas piping . . . . . . . . . . . . . . . . . . . . . . . . .1212.0

Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .203.0

Direct-vent . . . . . . . . . . . . . . . .206.0, 509.2.6, 509.5.10.1,

509.8.1, 509.12

INDEX

In attics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .508.4

Indirect waste type . . . . . . . . . . . . . . . . . . .806.0, 807.0

In under-floor spaces . . . . . . . . . . . . . . . . . . . . . . .508.4

On roofs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .508.0

Vent Connectors . . . . . . . . . . . . . . . . . .509.10, 510.2.11

Venting of . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .509.0

APPLICATION FOR PERMIT . . . . . . . . . . . . . . . . . . .104.3

APPROVED, DEFINITION . . . . . . . . . . . . . . . . . . . . . .203.0

APPROVED TESTING

AGENCY, DEFINITION . . . . . . . . . . . . . . . . . . . . . . .203.0

AREA DRAINS . . . . . . . . . . . . . . . . . . . . . . . .203.0, 1101.15

ASBESTOS-CEMENT PIPE . . . . . . . . . . . .Table 510.1.2(5),

Table 510.2(5)

ASPIRATORS . . . . . . . . . . . . . . . . . .203.0, 603.5.9, 1303.5

AUTHORITY HAVING JURISDICTION . . . 1.2.0, 1.2.2, 1.3.0,

1.4.0, 1.5.0, 1.6.0,

1.7.0, 1.8.0, 1.9.0,

1.10.0, 1.11.0, 1.12.0,

1.13.0, 1.14.0,

103.0, 203.0

AUTHORITY TO

Disconnect gas . . . . . . . . . . . . . . . . . . . . . . . . . .1206.0

Plumbing system . . . . . . . . . . . . . . . . . . . . . . . . . .106.5

Render gas service . . . . . . . . . . . . . . . . . . . . . . .1205.0

AUTOMATIC

Drains . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .K 106.2.4

Flushometer valves . . . . . . . . . . . . . . . . . . . . . . . .413.2

Pressure relief valve . . . . . . . . . . . . . . . . . . . . . . .608.4

Pumps . . . . . . . . . . . . . . . . . . . . . . . . . .1017.1, 1101.6.2,

C 501.2.5, H 601.8

Seat cover dispensers . . . . . . . . . . . . . . . . . . . . . .411.3

Shutoff . . . . . . . . . . . . . . . . . . . . . . . . . . . .420.3, 504.6

Siphon, septic tanks . . . . . . . . . . . . . . . . . . . . . .H 601.8

Sprinkler systems . . . . . . . . . . . . . . . . . . . . . . .603.5.14 Sumps and receiving tanks . . . . . . . . . . . . . . . . . .710.9

Vent dampers, fuel gas . . . . . . . . . . . .509.14, 509.14.1

AUTO WASH RACKS . . . . . . . . . . . . . . . . . . . . . . . . .1011.0

– B –

BACKFILLING . . . . . . . . . . . . . . .314.4, 314.4.1, 1210.1.2.1,

1323.5.1, 1323.5.4, 1323.5.5,

1504.7.2, H 601.2

BACKFLOW

Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 204.0

Prevention . . . . . . . . . . . . . . . . . . . . . . . . . 602.2, 602.3

Prevention devices

or assembly . . . . . . . . . . . . 603.1, Table 603.2, 603.3

BACKFLOW CONNECTION . . . . . . . . . . . . . . .204.0, 603.0

BACKFLOW PREVENTERS

Approved standards . . . . . . . . . . . . . . . . . . .Table 603.2

Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .204.0

For hot water . . . . . . . . . . . . . . . . . . . . . . . . . . .603.4.5

Integral . . . . . . . . . . . . . . . . . . . . . . . . . . . .417.2, 417.3,

417.4, 603.4.6

Prohibited locations . . . . . . . . . . . . . . . . . . . . . .603.4.9

Protection from damage . . . . . . . . . . . . . . . . . . .E 302.6 Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .603.2 BACKFLOW PREVENTION . . . . . . . . . . . . . . .602.3, 603.3

BACK-TO-BACK FIXTURES . . . . . . . . . . . . . . . . . . . .704.2

BACKWATER VALVES

Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 204.0

Where Required. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 710.6 BALLCOCKS . . . . . . . . . . . . . . . . . . . .Table 603.2, 603.5.2

BAPTISTRIES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .406.1

BATHROOM, HALF, DEFINITION . . . . . . . . . . . . . . . .204.0

BATHROOM GROUP . . . . . . . . . . . . .204.0, 908.2, C 303.0

BATHTUB, PROHIBITED TYPE . . . . . . . . . . . . . . . . .405.3

BATHTUBS AND

WHIRLPOOL BATHTUBS . . . . . . . . . . . . . . . . . . . .409.0

BIDETS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .402.5, 410.0

BLOWOFF CONDENSERS . . . . . . . . . . .810.1, Table 810.1

BOARD OF APPEALS . . . . . . . . . . . . . . . . . . . . . . . . .107.0

BODY SPRAY, DEFINITION . . . . . . . . . . . . . . . . . . . .204.0

BOILER BLOWOFF

Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .204.0

Discharge requirements . . . . . . . . . . . . . . . . . . . .810.1

BONDING JUMPER

Bonding of CSST fuel gas piping . . . . . . . . . . . . .1211.2

Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .204.0

BOTTLING ESTABLISHMENTS . . . . . . . . . . . . . . . .1013.0

BUILDING DRAIN

Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .204.0

Existing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .102.4.1

Material . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Table 701.2

Sizing . . . . . . . . . . . . . . . . . .703.0, Table 703.2, 710.5, C 304.2, Table C 304.2

Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .712.0 BUILDING DRAIN (STORM), DEFINITION . . . . . . . . .204.0

BUILDING SEWERS

Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .204.0

Existing . . . . . . . . . . . . . . . . . . . . . . . . . .102.4.1, 715.3

Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .721.0

Material . . . . . . . . . . . . . . . . . .Table 701.2, 715.1, 720.0

Sizing . . . . . . . . . . . . .710.5, 717.0, Table 717.1, C 304.2 Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .723.0 BUILDING SUPPLY . . . . . . . . . . . . . . . . . .204.0, Chapter 6 BURRED ENDS . . . . . . . . . . . . . . . . .309.3, 609.1, 701.3.1,

903.3, 1208.5.7, 1321.7.2

– C –

CAPACITY OF

Breathing air cylinders . . . . . . . . . . . . . . . . . . . .F 1001.1 Graywater systems . . . . . . . . . . . . . . . . . . . . . .1503.2.1 Interceptors . . . . . . . . . . . . . . . . . . . . . . . . . . . .1014.2.1 Irrigation field and

mulch basin . . . . . . . . . .1504.2, Table 1504.2, 1504.3

564 2025 CALIFORNIA PLUMBING CODE

INDEX

Medical air compressors . . . . . . . . . . . .1310.3.1, 1311.2

Rectangular scuppers . . . . . . . . . . . . . . . . . . . .D 104.0

Sewage ejectors or pumps . . . . . . . . . . . . . . . . . .710.3

Sump pump . . . . . . . . . . . . . . . . . . . . . . . . . . . .1101.6.2

Water heaters . . . . . . . . . . . . . . . . . . .501.1, Table 501.1(1)

CAST-IRON PIPE

Approved standards . . . . . . . . . . . . . . . . . . . . . .301.2.4

Discharge line from ejectors . . . . . . . . . . . . . . . . .710.4

Drainage piping . . . . . . . . . . . . . . . . . . . . . . . . . . .701.2

Fittings . . . . . . . . . . . . . . . . . .301.2.3, 604.6, 1208.5.9.5

Flanges . . . . . . . . . . . . . . . . . . . . . . . . . . . .1208.5.11.1

Joining . . . . . . . . . . . . . . . . . . . . . . . . . .705.2, 705.10.1

Prohibited use . . . . . . . . . . . . . . . . . . . .316.1, 1208.5.2

CAULKED JOINTS . . . . . . . . . . . . . . . . . . . . . . . . . .705.2.1

CAULKING FERRULES . . . . . . . . . . . . . .701.6, Table 701.6

CERTIFICATION

Backflow assembly testers . . . . . . . . . . . . .205.0, 603.2

Medical gas or medical

vacuum installers . . . . . . . . . . . . . . . . . . . . . .1323.10

Medical gas or medical

vacuum systems . . . . . . . . . . . . . . . . . . . . . . .1306.0

Pipe welder, definition . . . . . . . . . . . . . . . . . . . . . .225.0

Residential fire sprinklers installers . . . . . . . . . . . .612.1

CESSPOOL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .H 801.1

Abandoned . . . . . . . . . . . . . . . . . . . . . . .722.0, H 1101.0

Connections to sewer prohibited . . . . . . . . . . . . . .714.3

Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .205.0

CHECK VALVES

In drainage systems . . . . . . . . . . . . . . .710.4, 710.12.1,

710.13.2, 1004.2

In firefighter breathing air

replenishment systems . . . . . . . . . . . . . . . . . .F 501.7,

F 601.5.1, F 701.3

In fuel gas systems . . . . . . . . . . . . . . . . . . . . . .1208.7.1

In medical gas and

medical vacuum systems . . . . . . . . .1311.5(2), 1313.5

In water supply systems . . . . . . . . . .Table 603.2, 603.3,

608.3

CHEMICAL RESISTANT GLASS PIPE . . . . . . . . . . . .811.2

CHEMICAL WASTES . . . . . . . . . . . . . . . . . . . . .205.0, 811.0

CHIMNEYS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .509.5

Cleanouts . . . . . . . . . . . . . . . . . . . . .509.5.6.2, 509.5.9

Decorative Shrouds . . . . . . . . . . . .509.5.1.1, 509.5.4.3

Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .205.0

Existing . . . . . . . . . . . . . . . . . . . . . . .509.5.6, 509.5.6.3

Factory-built . . . . . . . . . . . . . . . . . . . . . . . . . . . .509.5.1

Masonry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .509.5.3

Metal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .509.5.2

Size . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .509.5.5

Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .509.5.8

Termination . . . . . . . . . . . . . . . . . . . . . . . . . . . . .509.5.4

CHLORINATED POLYVINYL

CHLORIDE (CPVC) PIPE OR TUBING

Approved standards, water supply . . . . . . . .Table 604.1

Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .205.0

Joining and connections . . . . . . . . . . . . . . . .(see Joints

and connections)

Installation, residential . . . . . . . . . . . . . . . . . . . . .604.1.1

CHLORINATED POLYVINYL

CHLORIDE/ALUMINUM/CHLORINATED

POLYVINYL CHLORIDE

(CPVC-AL-CPVC) PIPE OR TUBING

Approved standards, water supply . . . . . . . .Table 604.1

Joining and connections . . . . . . . . . . . . . . . .(see Joints

and connections)

CIRCUIT VENTING . . . . . . . . . . . . . . . . . . . . . . . . . . . .911.0

CLARIFIERS . . . . . . . . . . . . . . . . . . . . . . . . . .205.0, 1009.0

CLEANOUT PLUGS OR CAPS . . . . . . . . . . .707.1 – 707.3,

707.13, 1107.2

CLEANOUTS

Access . . . . . . . . . . . . . . . . . . . . . .707.8, 719.5, 801.3.2

Building sewer . . . . . . . . . . . . . . . . . . . . . . 310.12, 719.0 Change of direction . . . . . . . . . . . . . . . . . .707.4, 719.1,

801.3.2, 803.3, 1002.3

Clearances . . . . . . . . . . . . . . . . . . . . . . . . .707.8, 707.9

Condensate drain . . . . . . . . . . . . . . . . . . . . . . . .814.3.1

Cover plate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .707.8

Direction of flow . . . . . . . . . . . . . . . . . . . . . .707.5, 719.4

Horizontal drains . . . . . . . . . . . . . . . . . . . . .707.4, 719.1

Manholes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .719.6

Plugs . . . . . . . . . . . . . . . . . . . . . . . .707.1, 707.2, 707.12

Prohibited use of . . . . . . . . . . . . . . . . . . . . . . . . . .316.1

Size . . . . . . . . . . . . . . . . . . . . . . . . . .707.1, Table 707.1

Soil or drainpipes . . . . . . . . . . . . . . . . . . . . . . . . . .317.1

Where required . . . . . . . . . . . . . . . .707.4, 719.1, 909.1,

910.6, 1002.3, 1008.1,

1017.1, 1101.13.1, E 301.4

CLEARANCE

Cleanouts . . . . . . . . . . . . . . . . . . . . . . . . . .707.8, 707.9

Fuel gas vents . . . . . . . . . .509.7.3.4, Table 509.7.3.4(1),

Table 509.7.3.4(2)

Water heaters . . . . . . . . . . . . . . . . . . . .504.3.1, 504.3.2

CLEAR WATER WASTE

Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .205.0

Discharge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .812.1

CLINICAL SINKS . . . . . . . . . . . . . . . . .205.0, 413.1, 1303.7

CLOSET BENDS . . . . . . . . . . . . . . . . . . . . . .310.3, 402.6.1

CLOSET RINGS . . . . . . . . . . . . . . . . . . . . . . . . . . . .402.6.1

CLOSET SCREWS . . . . . . . . . . . . . . . . . . . . . . . . . .402.6.2

CLOTHES WASHER SYSTEM

Commercial gray water discharge . . . . . . . .1503.8.2.3

Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 205.0

Residential gray water . . . .1503.1.1, 1503.2.2 Exception

INDEX

CODE, DEFINITION . . . . . . . . . . . . . . . . . . . . . . . . . . .205.0

COLLECTION CENTERS AND

FACILITIES . . . . . . . . . . . . . . . . . . . . . .601.6, 725.0, 1010.3

COMBINATION WASTE AND

VENT SYSTEMS . . . . . . . . . . . . .205.0, 910.0, Appendix B

COMBUSTIBLE

MATERIAL, DEFINITION . . . . . . . . . . . . . . . . . . . . .205.0

COMBUSTIBLE PIPING

INSTALLATIONS . . . . . . . . . . . . . . . . . . . . . . . . . .1404.0

COMBUSTION AIR . . . . . . . . . . . . . . . . . . . . . . . . . . .506.0

COMMISSARIES SERVING MOBILE

FOOD PREPARATION UNITS . . . . . . . . . . . . . . . . .422.10

Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 205.0

COMMON VENT, FUEL GAS . . . . . .509.6.3, 509.10.2.2,

509.10.2.3, 509.10.3.1,

509.10.8.2, 510.2.3, 510.2.9,

510.2.15, 510.2.16

COMPLEX SYSTEM . . . . . . . . . . . . . . . . . . . . . . . . .1503.1.3

Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 205.0

COMPRESSION JOINTS . . . . . . . . . . .605.7.1.1, 605.10.1.1

705.2.2, 719.6, 1208.5.10.3

CONCEALED SLIP JOINTS . . . . . . . . . . . . . . . . . . .402.10

CONCEALING OF WORK PROHIBITED

BEFORE INSPECTION . . . . .105.1, 105.2.1.1, 105.2.1.2,

503.2, 1203.2

CONDENSATE WASTE

AND CONTROL . . . . . . . . . . . . . . . . . . . . . .814.0 – 814.6

CONDENSATE PUMPS . . . . . . . . . . . . . . . . . . . . . .814.1.1

CONDENSERS AND SUMPS . . . . . . . . . . . . . . . . . . .810.0

CONDUCTORS,

STORM WATER . . . . . . . . . . . . .205.0, 1101.12.1, 1101.13.1,

1101.16, 1103.0, 1602.6,

1602.7.2, 1603.11, K 103.2,

K 104.5, K 106.4

CONTAMINATION . . . . . . . . . . . . . . . . . . .205.0, 602.2, 602.3,

603.1, 811.1, 1321.8.8,

1321.10.4, 1321.10.7,

C 302.1, F 1101.3

CONTINUOUS VENT, DEFINITION . . . . . . . . . . . . . . .205.0

CONTINUOUS WASTES

Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .205.0

Materials . . . . . . . . . . . . . . . . . . . . . . . . . . .407.5, 701.4

CONTROL VALVES . . . . . . . . . . . . . . . . . . . .408.4, 408.10,

606.5 – 606.7, 1303.1

COOLING WATER . . . . . . . . . . . . . . . . . . . . . . . . . . . .808.0

COPPER OR COPPER ALLOY

PIPE OR TUBING

Fuel gas . . . . . . . . . . . . . . . . . . . . .1208.5.2.3, 1208.5.3.1,

Table 1215.2(7) – Table 1215.2(13),

E 403.5

Joining and connections . . . . . . . . . . . . . . . . . .(see Joints

and connections)

Medical gas and

medical vacuum . . . . . . . . . . . . . . . . . . . . . . . . . 1318.4,

1319.1, 1323.4.2

Penetrating framing members . . . . . . . . . . . . . . . . . . 312.9

Prohibited use of . . . . . . . . . . . 811.1, 1208.5.2.3, 1208.5.3

Standard weight. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 302.1

Underground drainage and vent . . . . . . . . . . . . . . . . 903.2

Water supply . . . . . . . . . . . . . . . . . . . . . . . . . 604.3, 604.4,

A 105.2, E 302.2.1

COSMETOLOGY . . . . . . . . . . . . . . . . . . . . . . . . . . . . .422.8

Drinking water . . . . . . . . . . . . . . . . . . . . . . . . . . .601.4.3

Establishments . . . . . . . . . . . . . . . . . . . . . . . . . . .422.9

Handwashing Facilities . . . . . . . . . . . . . . . . . . . .601.4.2

Hot-and cold running water . . . . . . . . . . . . . . . .601.4.1

COVERED MULTIFAMILY

DWELLINGS, DEFINITION . . . . . . . . . . . . . . . . . . . . 205.0

CRITICAL CARE AREA,

DEFINITION . . . . . . . . . . . . . . . . . . . . . . . . . . . . .205.0

CRITICAL LEVEL . . . . . . . . . . . . . . . . . .205.0, Table 603.2,

603.5.1, 603.5.2, 603.5.5,

603.5.13, C 501.3

CROSS-CONNECTION CONTROL . . . . . . . . . . . . . . .603.0

CROSS-CONNECTION, DISCOVERED . . . . . . . 1505.14.2.3,

1605.3.3

CROSS-LINKED POLYETHYLENE (PEX)

PIPING OR TUBING

Approved standards, water supply. . . . . . . . Table 604.1

Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 218.0

Flexible connectors . . . . . . . . . . . . . . . . . . . . . . . 604.13

Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 604.1.2

Joining and connections . . . . . . . . . . . . . . . . (see Joints

and connections)

CROSS-LINKED POLYETHYLENE-ALUMINUM-

CROSSLINKED POLYETHYLENE (PEX-AL-PEX)

PIPING OR TUBING

Approved standards, water supply. . . . . . . . Table 604.1

Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 218.0

Flexible connectors . . . . . . . . . . . . . . . . . . . . . . . 604.13

Joining and connections . . . . . . . . . . . . . . . . (see Joints

and connections)

– D –

DEPARTMENT, DEFINITION . . . . . . . . . . . . . . . . . . . . . 206.0

DESIGN FLOOD ELEVATION . . . . . . . . . . . . . .206.0, 301.4

DEVELOPED LENGTH

Bar and fountain sink trap . . . . . . . . . . . . . . . . . . .801.4

Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .206.0

DWV piping . . . . . . . . . . . . . . . . . . . . . .707.4, 710.13.2

Indirect waste piping . . . . . . . . . . . . . . . . . . . . . .801.3.1

Trap arm . . . . . . . . . . . . . . . . . . . .1002.2, Table 1002.2

Water supply piping . . . . . . . . . .610.9, A 104.4, A 107.2

Wet vent . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .908.1

566 2025 CALIFORNIA PLUMBING CODE

INDEX

DIALYSIS WATER-DISTRIBUTION SYSTEMS . . . . . . . .614.0

DIELECTRIC INSULATORS . . . . . . . . . . . . . . . . . . . . .507.1

DISHWASHING MACHINES . . . . . . . . . . . . . . . . . . . .414.0

Air gap . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .807.3 Approved standards . . . . . . . . . . . . . . . . . . . . . . .414.1 Backflow protection . . . . . . . . . . . . . . . . . . . . . . . .414.2 Discharge, drainage . . . . . . . . . . .414.3, 807.3, 1014.3.2 Drainage discharge, prohibited . . . . . . . .419.2, 1014.1.3 Drainage fixture unit (DFU) . . . . . . . . . . . . .Table 702.1 Energy efficiency . . . . . . . . . . . . . . . . . . . . . . . .L 403.1 Flexible connector length . . . . . . . . . . . . . . . . . . .604.12 Water supply fixture units (WSFU) . . . . .Table 610.3, Table A 103.1, Table C 303.2

DISINFECTED TERTIARY RECYCLED

WATER

Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 206.0

DISPOSAL FIELDS

Construction . . . . . . . . . . . . . . . . . . . . . . . . . . . .1504.5

Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .206.0

Groundwater . . . . . . . . . . . . . . . . . . . . . . . . . . . .1504.4

Material . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1504.5.3

Private sewage system . . . . . . . . . . . . . . . .Appendix H Valved zones . . . . . . . . . . . . . . . . . . . . . . . . . . . .1504.1

DOMESTIC HOT-WATER DISTRIBUTION

WATER SYSTEMS FOR HEALTH FACILITIES

AND CLINICS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .613.0

DOSING TANKS . . . . . . . . . . . . . . . . . . . . . . . . . . . .H 601.8

DRAINAGE SYSTEM

Cleanouts . . . . . . . . . . . . . . . . . . . . . . . . . .707.0, 719.0 Change in direction . . . . . . . . . . . . . . . . . . . . . . . .706.0 Damage to public sewer or private sewage disposal system . . . . . . . . . . . . .305.1, 714.0 Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .206.0

Fixture units . . . . . . . . . . . . . . . . . . . . . . . . .Table 702.1

Gutters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1010.5.1

Independent systems . . . . . . . . . . . . . . . . . . . . . . .311.0 Indirect waste . . . . . . . . . . . . . . . . . . . . . . . . .Chapter 8

Joints and connections . . . . . . . . . . . . . . . . . . . . .705.0

Materials . . . . . . . . . . . . . . . . .701.2, Table 701.2, 715.0

Obstruction of flow . . . . . . . . . . . . . . . . . . . . . . . . .310.5

Piping (OSHPD) . . . . . . . . . . . . . . . . . . . . . . . . . .310.9 Sizing . . . . . . . . . . . . . . . . . .702.0, Table 702.1, 703.0, Table 703.2, 717.0, Table 717.1 Slope of piping . . . . . . . . . . . . . . . . . . . . . . . . . . .708.1 Sumps and ejectors . . . . . . . . . . . . . . . . . . . . . . . .710.0 Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . .712.0, 723.0 Waste detrimental to . . . . . . . . . . . .306.0, 811.1, 1012.1 DRINKING FOUNTAINS . . . . . . . . . . . . . . . . .206.0, 415.0,

809.0, E 501.8 DUCTILE IRON PIPE . . . . . . . . . . . . . . .Table 604.1, 605.4 DURHAM SYSTEM, DEFINITION . . . . . . . . . . . . . . . .206.0

– E –

EARTHQUAKE-ACTUATED GAS

SHUTOFF VALVES . . . . . . . . . . . . . . . . . . . . . . . . . .1211.8

EFFECTIVE GROUND-FAULT

CURRENT PATH, DEFINITION . . . . . . . . . . . . . . . . .207.0

EFFECTIVE OPENING . . . . . . . . . . . . .207.0, Table 603.3.1

EJECTORS . . . . . . . . . . . . . . . . . . . . . . . . . . .710.2 – 710.5,

710.9 – 710.12

EMERGENCY EYEWASH AND

SHOWER EQUIPMENT . . . . . . . . . . . . . . . . . . . . . .416.0

EMERGENCY SANITARY DRAINAGE . . . . . . . . . . . . . .727.0

ENFORCING AGENCY, DEFINITION . . . . . . . . . . . . . . . 207.0

ESSENTIAL PLUMBING PROVISIONS . . . . . . . . . . . . .321.0

EXCAVATIONS . . . . . . . . . . . . . . . . .314.0, 1203.2, 1504.4,

H 301.1, H 701.4

EXCESSIVE WATER PRESSURE . . . . . . . . . . . . . . . .608.2

EXPANSION AND CONTRACTION

OF PIPE, PROVISION FOR . . . . . . . . . . . . . . . . . . .312.2

EXPANSION TANKS . . . . . . . . . . . . . . . . . . . . .608.2, 608.3

– F –

F RATING . . . . . . . . . . . . . . .208.0, 1404.3, 1405.3, 1406.4

FAUCETS

Approved standards . . . . . . . . . . 417.1, 417.4, L 402.5.1

Common and Public Use Area . . . . . . . . . . . . . . 407.2.3

Kitchen . . . . . . . . . . . . . . . . . . . . . . . . . 420.2.1, 420.2.2

Maximum flow rate. . . . . . . . . . . . . . . . . . . 407.2, 420.2,

L 402.4, L 402.5

Metering. . . . . . . . . . . . . . . . . . 407.2.4, 407.2.4.1, 407.4,

Table L 402.1, L 402.5.2

Public Lavatory . . . . . . . . . . . . . . . . . . . . . . . . . .407.2.1

Residential kitchen . . . . . . . . . . . . . . . . 420.2.2, L 402.4

Residential Lavatory. . . . . . . . . . . . . . . . . . . . . . .407.2.2 Self closing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 407.4 Separate controls for hot and cold water . . . . . . . . 417.5

Sink faucets. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 420.2

Temperature limitation. . . . . . . . . . . 407.3, 408.4, 409.4,

410.3, 416.2

With pull out spouts . . . . . . . . . . . . . . . . . . . . . . . . 417.4 FIRE SPRINKLERS, RESIDENTIAL . . . . . . . . . . . . . .612.0

FIREFIGHTER BREATHING AIR

REPLENISHMENT SYSTEMS . . . . . . . . . . . .Appendix F

FITTINGS

Branch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .419.2

Cleanout . . . . . . . . . . . . . . . . . . . . . . . . . . .707.1, 707.2

Dielectric . . . . . . . . . . . . . . . . . . . . . . .605.15, 605.16.1,

605.16.3, 705.10.2,

1322.6.1, E 403.8.2

Drainage system . . . . . . . . . . .Table 701.2, 701.3, 705.0,

706.0, E 504.3

Firefighter breathing air replenishment systems . . . . . . . . . . . . . . . . . .F 801.3

Fixture . . . . . . . . . . . . . . . . . . . . . . .402.9, 403.2, 417.0,

603.5.20, L 402.0

Fuel gas piping . . . . . . . . . . . . . . . .1208.5.4, 1208.5.9,

1208.5.10, 1210.4.1

Fuel gas vent . . . . . . . . . . . . . . . . . .509.3.6(2), 509.4.2,

510.2.8, 510.2.9

INDEX

Gray water . . . . . . . . . . . . . . . . . . . . . . . . . . . .1503.9.2

Inlet, for fixture connections . . . . . . . . . . . .704.1, 704.2

Lead content . . . . . . . . . . . . . . . . . . . . . .604.2, 604.2.1

Material of . . . . . . . . . . . . . . . . . . . .604.0, Table 604.1,

Table 701.2, 701.3, 903.0,

1208.5, 1208.5.9, 1208.5.9.5

Medical gas

and medical vacuum . . . . . .1320.2, 1320.2.1, 1321.1

Plumbing vent . . . . . . . . . . . . . . . . . . . . . . . . . . . .903.0

Prohibited . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .310.1

Screwed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .310.8

Water supply system . . . . . . . . . . . .604.0, Table 604.1,

605.0, A 107.3

FIXTURE . . . . . . . . . . . . . . . . . . . . .(see Plumbing fixtures)

Branch, definition . . . . . . . . . . . . . . . . . . . . . . . . .208.0

Calculations . . . . . . . . . . . . . . . . . . . . . . . . . . . .422.1.1

Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . .704.0

Drain, definition . . . . . . . . . . . . . . . . . . . . . . . . . . .208.0

Flanged connection . . . . . . . . . . . . . . . . . . . . . . . .402.6

Future installations . . . . . . . . . . . . . . . . . . . . . . . .402.11

Plumbing . . . . . . . . . . . . . . . . . . (see Plumbing fixtures) Units, drainage (DFU) . . . . . . . . . . . 702.1, Table 702.1,

C 303.1, Table C 303.3

Units, water supply (WSFU) . . . . . . . 610.3, Table 610.3,

610.10, Table 610.10,

A 103.1, Table A 103.1,

C 303.1, Table C 303.2

FLAGPOLING OF VENTS . . . . . . . . . . . . . . . . . . . . . .906.3

FLAMMABLE VAPOR OR FUMES . . . . . . . . . . .208.0, 507.12

FLASHING . . . . . . . . . . . . . . . . . . . . . . . . .701.5, 906.5, 906.6,

1102.3, K 103.1.1

FLOOD RESISTANT CONSTRUCTION

Coastal high hazard area . . . . . . . . . . . . .205.0, 301.4.1

Design flood elevation . . . . . . . . . . . . . . . . . . . . . .206.0

Flood hazard area . . . . . . . . . . . . . . . . . . . . . . . . .208.0

Flood hazard resistance . . . . . . . . . . . . . . . . . . . . .301.4

FLOOD-LEVEL RIM . . . . . . . . . . . . . . . . . . . .208.0, 801.3.2

FLOODED, DEFINITION . . . . . . . . . . . . . . . . . . . . . . .208.0

FLOOR DRAINS . . . . . . . . . . . . . . . . . . . . . . . . . . . . .418.0

Connected into a trap . . . . . . . . . . . . . . .1006.1, 1007.1

Directly connected to

drainage system . . . . . . . . . . . . . . . . . . . . . . . .1007.1

Location . . . . . . . . . . . . . . . . . . . . .418.3, 418.4, 1017.1

Required . . . . . . . . . . . . . . .408.8, 704.3, 1017.1, E 501.6

FLUSH TANKS . . . . . . . . . . . . . . . . . . .208.0, 402.4, 413.1,

413.3, 413.5, 601.2

FLUSH VALVES, DEFINITION . . . . . . . . . . . . . . . . . . .208.0

FLUSHOMETER TANKS . . . . . . . . . . . . . . . . .208.0, 411.2,

413.1, 603.5.3

FLUSHOMETER VALVES . . . . . .208.0, 413.1, 413.2, 601.2,

603.5.1, 610.10,

Table 610.10, L 402.2.2

FLUX . . . . . . . . . . . . . . . . . . . . . . . . . .604.1, 604.2, 605.1.1,

605.1.4, 705.3.1, 705.3.3,

1321.9, 1321.9.2, 1321.11.1

FOG DISPOSAL SYSTEMS . . . . . . . . . . . . . .208.0, 1015.0

FOOD ESTABLISHMENT, DEFINITION . . . . . . . . . . . . . 208.0

FOOD-HANDLING EQUIPMENT

AND FIXTURES . . . . . . . . . . . . . . . . . . . . . . . . . . . .801.3

FOOD WASTE DISPOSER . . . . . . . . . . . . . . .419.0, 714.4,

1001.2, 1014.1.3

FREEZE PROTECTION . . . . . . . . . . . . . . . . . . .312.6, 603.4.7,

603.5.7, 608.2, 1005.1

1210.1.4, 1210.7.1, 1323.2,

1503.9.4, 1603.16, K 106.0

FROST OR SNOW CLOSURE . . . . . . . . . . . . . . . . . . .906.7

FUEL GAS PIPING . . . . . . . . . . . . . . . . . . . . . . .Chapter 12 Cathodic protection . . . . . . . . . . .E 403.8.1 – E 403.8.4 Change in direction . . . . . . . . . . . . . . . . . . . . . . .1210.6

Concealed location . . . . . . . . . . . . . . . . . . . . . . .1210.4

Detection of leaks . . . . . . . . . . . . . . . . . . . . . . . .1213.4

Electrical bonding and grounding . . . . . . . . . . . . .1211.0 Inspection and testing . . . . . . . . . . . . . . .1203.0, 1213.0

Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1210.0

Interconnections . . . . . . . . . . . . . . . . . . . . . . . . .1208.2

Joints and fittings . . . . . . . . . . . . . . . . . . . . . . . . .1208.5.4,

1208.5.10 – 1208.5.11.4,

1213.2.1, 1213.2.2

Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1208.5

Obstruction of flow . . . . . . . . . . . . . . . . . . . . . . .1210.10

Purging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1213.6 Sizing . . . . . . . . . . . . . . . . . . . .1208.4, 1214.0, 1215.0, Table 1215.2(1) – Table 1215.2(36),

E 403.3

Supports . . . . . . . . . . . . . . . .1210.3.5, Table 1210.3.5.1 Underground installation . . . . . .1208.5.2.3, 1208.5.3.4,

1210.1, E 401.2,

E 403.7, E 403.8.4

FUEL GAS VENTS

Appliances not requiring vents . . . . . . . . . . . . . .509.2.1 Caps . . . . . . . . . . . . . . . . . . . . . . .509.6.1(6), 509.7.4(3)

Clearance . . . . . . . . . . . . . . . . . . . . . . . . . . . .509.7.3.4,

Table 509.7.3.4(1), Table 509.7.3.4(2)

Dampers . . . . . . . . . . . . . . . . . . . . . . . .509.13, 509.14,

509.14.1

Direct-vent . . . . . . . . . . . . . . . . . . . . . . . . . . . . .509.2.6

General requirements . . . . . . . . . . . . . . . . . . . . . .509.0

Insulation shield . . . . . . . . . . . . . . . . . . . . . . . .509.6.1.1

Integral . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .509.2.7 Listing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .509.1

Mechanical draft . . . . . . . . . . . . . . . .509.3.3, 509.3.3.4

Obstruction of flow . . . . . . . . . . . . . . . . . . . . . . . .509.15

Plastic piping . . . . . . . . . . . . . . . . . . . . . . . . . . .509.4.1 Special . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .509.4.3

568 2025 CALIFORNIA PLUMBING CODE

INDEX

Termination . . . . . . . . . . . . . . . .509.6.1, 509.7.2, 509.8

Wall penetrations . . . . . . . . . . . . . . . . . . . . . . . . . .509.8 FUEL GAS VENT, SIZING Category I appliances . . . . . . . . . . . . . .509.6.2.1, 510.0 Multiple appliances . . . . . . . . . . . . . . . . . . . . . . . .510.2, Table 510.2(1) – Table 510.2(9) Multistory . . . . . . . . . . . . . . . . . . . . .509.6.3, 509.6.3.2,

510.2.13 – 510.2.16

Single appliance . . . . . . . . . . .509.7.4(1)(b), 509.10.2.1,

510.1, 510.1.2,

Table 510.1.2(1) – Table 510.1.2(6)

FUTURE CONNECTIONS . . . . . . . . . . . . . . . . . . . .1504.9.1

– G –

GANG OR GROUP SHOWERS . . . . . . .209.0, 408.4, 408.8 GARBAGE GRINDER . . . . . . . . .(see Food waste disposer)

GRADE

Building sewer . . . . . . . . . . . . . . . . . . . . . . . . . . . .718.1

Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .209.0

Horizontal drainage . . . . . . . . . . . . . . . . . . . . . . . .708.0 GRAVITY DRAINAGE REQUIRED . . . . . . . . . . . . . . .709.0

GRAYWATER, DEFINITION . . . . . . . . . . . . . . . . . . . . . . 209.0

GRAY WATER SYSTEMS

Alternate water sources . . . . . . . . . . . . . . . . . . .601.3.3

Alternate water source testing, inspection, and maintenance frequency . . . . . . . . . . .Table 1501.5 Components . . . . . . . . . . . . . . . . . . . . . . . . . . . .1503.9 Daily discharge . . . . . . . . . . . . . . . . . . . . . . . .1503.8.3

Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .209.0

Gray water systems . . . . . . . . . . . . . . . . . . . . . . .1503.0 Inspection and testing . . . . . . . . . . . . . . . . . . . . .1502.0 Operation and maintenance manual . . . . . . . . . .1501.6 GREASE INTERCEPTORS . . . . . .1014.0, 1014.1B, 1014.1C

Approved standards . . . . . . . . . . . . . . . . . . . . . . .1014.1

Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .209.0

Capacity . . . . . . . . . . . . . . . . . .1014.2.1, Table 1014.2.1 Gravity-type . . . . . . . . . . . . . . . . .1014.3, Table 1014.3.6 Hydromechanical-type . . . . . . . . . . . . . . . . . . . . .1014.2 Not required . . . . . . . . . . . . . . . . . . . . . . . . . . . .1014.1.3 Required . . . . . . . . . . . . . . . . . .1010.1, 1014.1, H 101.3

GRINDER PUMPS . . . . . . . . . . . . . . . . . . . . . . . . . . .710.12

GROUNDWATER, DEFINITION . . . . . . . . . . . . . . . . . .209.0

– H –

HANDHELD SHOWERS . . . . . . . . . . . . . . . . . . . . . . . .417.3

HANDWASHING FIXTURE

Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 210.0

HANGERS . . . . . . . . . . . . . . . . . . . . . . . . . . .(see Supports) HARMFUL WASTES . . . . . . . . . . . . . . . . . . . .(see Wastes, detrimental or harmful) HEALTH AND SAFETY . . . . . . . . . . . . . . . . . . .101.3, 102.5

HEALTH FACILITIES AND CLINICS,

WATER DISTRIBUTION . . . . . . . . . . . . . . . . . . . . . .613.0

HEAT EXCHANGERS . . . . . . . . . . . . . . . . . . . . . . .505.4.1,

603.5.4, C 302.0

HEAT-FUSION JOINTS . . . . . . . . . . . . . . . . .212.0, 605.6.1,

605.11.1, 1208.5.10.2

HORIZONTAL BRANCH,

DEFINITION . . . . . . . . . . . . . . . . . . . . . . . . . . . . .210.0

HORIZONTAL PIPE,

DEFINITION . . . . . . . . . . . . . . . . . . . . . . . . . . . . .210.0

HORIZONTAL-TO-HORIZONTAL

DRAINAGE FITTINGS . . . . . . . . . . . . . . . . . . . . . . .706.3

HORIZONTAL-TO-VERTICAL

DRAINAGE FITTINGS . . . . . . . . . . . . . . . . . . . . . . .706.2

HORSE MEAT AND PET FOOD

ESTABLISHMENTS . . . . . . . . . . . . . . . . . . . .601.8, 1010.4 HOT-MOPPED SHOWER PANS . . . . . .(see Shower, pans) HOT WATER SUPPLY PIPING . . . . . . . . . . . . .601.2, 609.1,

609.4, 609.12,

610.3, 610.12.1,

L 501.0, L 502.0, L 503.0 HOUSE DRAINS . . . . . . . . . . . . . . . . . .(see Building drain) HOUSE SEWERS . . . . . . . . . . . . . . . . .(see Building sewer)

– I –

IDENTIFICATION

Cast-iron soil pipe . . . . . . . . . . . . . . . . . . . . . . . . .701.2 Copper tubing . . . . . . . . . . . . . . . . . . . . . . . . . . . .604.4 Fuel gas piping . . . . . . . . . . . . . . . . . . . . . . . . .1208.7.5 Medical gas and medical vacuum systems . . . . . . . . . . . . . . . . . .1318.5,

1323.13 – 1323.13.3,

1323.14, 1323.15 Piping, fittings, traps, and fixtures . . . . . . . . . . . . . .301.2.1 Potable and nonpotable water lines . . . . . . . . . . .615.0 Water, nonpotable and potable . . . . . . . . . . . . . . .601.3

INCREASERS AND REDUCERS . . . . . . . . . . . . . . . .316.0

INDIRECT-FIRED WATER HEATERS . . . . . . . .211.0, 505.4,

603.5.4, 608.7 INDIRECT WASTE . . . . . . . . . . . . . . . . . . . . . . . .Chapter 8 Air gap or break . . . . . . . . . . . . . . . . . . . . . . . . . . .801.2 Appliances . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .807.0 Approval required . . . . . . . . . . . . . . . . . . . . . . . . .802.0 Aspirators . . . . . . . . . . . . . . . . . . . . . . .603.5.9, 1303.5

Chemical wastes . . . . . . . . . . . . . . . . . . . . . . . . . .811.0

Cleanouts . . . . . . . . . . . . . . . . . . . . . . . . .801.3.2, 803.3

Clear water wastes . . . . . . . . . . . . . . . . . . . . . . . .812.0

Condensate . . . . . . . . . . . . . . . . . .814.1, 814.1.1, 814.5 Food handling fixtures . . . . . . . . . . . . . . . . . . . . .801.3.3 High temperature discharge . . . . . . . . . . . . . . . . .810.1 Interceptor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .902.1 Receptors . . . . . . . . . . . . . . . . . . . . . . . . . .801.4, 804.0 Sterile equipment . . . . . . . . . . . .801.6, 806.0, 1303.4.1 Swimming pools . . . . . . . . . . . . . . . . . . . . . . . . . .813.0 Traps . . . . . . . . . . . . . . . . . . . . . . .801.3.2, 803.3, 814.5

Vents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .803.3

Where required . . . . . . . . . . . . . . . . . . . . . . . . . . .801.2

INDIVIDUAL VENTS . . . . . . . . . . .211.0, Table 703.2, 904.1,

908.2.1

INDEX

INDUSTRIAL WASTES

Access . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .811.4

Approval required . . . . . . . . . . . . . . . . . . . . . . . . . .811.1

Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .211.0

Disposal . . . . . . . . . . . . . . . . . . . . . . . . . . .306.0, 811.7 Materials . . . . . . . . . . . . . . . . . . . . .811.2, 811.3, 903.2.2

Pretreatment required . . . . . . . . . . . . . . . . .306.1, 811.1 Prohibited material . . . . . . . . . . . . . . . . . .811.1, 903.2.2

Vents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .811.6

INSANITARY

Defective systems . . . . . . . . . . . . . . . . . . . . . . . .105.3.1

Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .211.0

Health and safety . . . . . . . . . . . . . . . . . . . . . . . . .102.5

INSPECTION AND TESTING . . . . . . . . . . . . . . . . . . . .105.0

Alternative engineering design . . . . .301.3.1 – 301.3.1.2,

301.5.6

Cross-Connection . . . . . . . . . . . . . . . . . . . . . .1505.14.2

Final . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .105.2

Periodic . . . . . . . . . . . . . . . . . . . . . . . . . . . .1505.14.2.4

Reclaimed (Recycled) Water . . .1505.14, Table 1505.16 Reinspection . . . . . . . . . . . . . . . . . . . . . . . . . . . .105.2.6 Required . . . . . . . . . . . . . .105.1, 105.2, 1203.0, 1213.1,

1321.12, 1324.0, 1406.0, 1501.5,

Table 1501.5, 1502.0, 1601.5,

Table 1601.5, 1605.0

Rough-in . . . . . . . . . . . . . . . . . . . . . . . .105.2, 1203.3.1 Scheduling of . . . . . . . . . . . . . . . . . . . . . . . . . . .105.2.3 Supply System . . . . . . . . . . . . . . . . . . . . . . . .1505.14.1 Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .105.3 Visual System . . . . . . . . . . . . . . . . . . . . . . .1505.14.2.1 INSPECTOR . . . . . . . . . . .(see Authority Having Jurisdiction)

INSULATION

Domestic hot water supply . . .609.12, 609.12.3, L 501.2 Fuel gas vent . . . . . . . . . . . . . . . . . . . . . . . . . .509.6.1.1 Penetrating firestop system . . . . . . . . . . .1404.5, 1405.7

Pool covers . . . . . . . . . . . . . . . . . . . . . . . . . . .L 503.3.6

Service hot water . . . . . . . . . . . . . . . . . . . . . .L 503.3.3

Tracer wire . . . . . . . . . . . . . . . . . . . .604.10.1, E 403.8.4 INTERCEPTING HOPPERS OR SINKS . . .(see Receptors) INTERCEPTOR (CLARIFIER)

Abandoned . . . . . . . . . . . . . . . . . . . . . . . . . . . .1014.3.7

Auto wash racks . . . . . . . . . . . . . . . . . . . . . . . . . .1011.0

Bottling establishments . . . . . . . . . . . . . . . . . . . .1013.0 Cleanouts, location . . . . . . . . . . . . . . . . . . . . . . . .707.7

Commercial and industrial laundries . . . . . . . . . .1012.0

Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .211.0

Grease . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1014.0

Industrial . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1009.0

Oil and flammable liquid . . . . . . . . . . . . . . . . . . . .1017.0 Packing establishments . . . . . . . . . . . . . . . . . . . .1010.0

Sand . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1016.0

Slaughterhouses . . . . . . . . . . . . . . . . . . . . . . . . .1010.0

Vents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .902.1

INTERMIXING OF

METALS PROHIBITED . . . . . . . . . . . . . . . . .310.6, 604.1

INVERT, DEFINITION . . . . . . . . . . . . . . . . . . . . . . . . . .211.0

IRON PIPE SIZE (IPS) PIPE . . . . . . . . . . . . . . . . . . . .302.0

IRRIGATION FIELD

Construction . . . . . . . . . . . . . . . . . . . . . . . . . . . .1504.5

Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .211.0

Gray water systems . . . . . . . . . . . . . .1504.5 – 1504.5.1

Groundwater . . . . . . . . . . . . . . . . . . . . . . . . . . . .1504.4

Material . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1504.5.2

Size . . . . . . . . . . . . . . . . .1504.2, Table 1504.2, 1504.3

Soil type . . . . . . . . . . . . . . . . . . . . . . . . . . .Table 1504.2

Subsoil construction . . . . . . . . . . . . . . . .Table 1504. 5.3

Valved zones. . . . . . . . . . . . . . . . . . . . . . . . . . . .1504.1

ISLAND FIXTURE, VENTING . . . . . . . . . . . . . . . . . . .909.0

– J –

JOINTS AND

CONNECTIONS . . . . . . . . . . . . . . . .315.0, 605.0, 705.0,

1208.5.10 – 1208.5.12.5,

1320.0

ABS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .705.1

Asbestos cement pipe . . . . . . . . . . . . .Table 510.1.2(5), Table 510.2(5)

Brazed joint . . . . . . . . . . .212.0, 605.1.1, 609.3, 705.3.1,

705.10.1, 705.10.2, 1208.5.10.1,

1208.5.10.2, 1309.4, 1321.1

Cast-iron piping . . . . . . . . . . . . . . . . . . . . .604.6, 701.2,

705.2, 705.10.1

Caulked joint . . . . . . . . . . . . . . . . . . . . . . . . . . . .705.2.1 Compression joint . . . . . . .605.6.2, 605.7.1, 605.10.1.1,

605.11.2, 705.2.2, 1208.5.10.3

Copper or copper

alloy pipe or tubing . . . . . . . . . . . . . . . .605.1, 705.3,

705.10.1, 705.10.2

CPVC piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . .605.2 CPVC-AL-CPVC piping or tubing . . . . . . . . . . . . .605.3 Ductile iron piping . . . . . . . . . . . . . . . . . . . . . . . . .605.4

Expansion joint . . . . . . . . . . . .705.9.2, 1101.5, 1213.2.2

Flared . . . . . . . . . . . . . . . . . . . . . . . .605.1.2, 1208.5.9.4

Galvanized steel pipe . . . . . . . . . . . . . . . . .605.5, 705.4 Ground joints . . . . . . . . . . . . . . . . . . . . . . . . . . .705.9.3 Heat-fusion joints . . . . . . . . . . . . . . . . . .212.0, 605.6.1,

605.11.1, 1208.5.10.2

Lead content . . . . . . . . . . . . . . . . . . . . . . . . . . . . .604.2

Mechanical joints . . . . . . . . . .605.1.3, 605.2.1, 605.4.1,

605.5.1, 605.6.2, 605.8.1,

605.9.2, 605.10.1, 605.11.2,

605.12.1, 605.13.1, 605.16.3,

705.1.1, 705.2.2, 705.3.2,

705.4.1, 705.6.1, 705.7.1,

705.8.1, 705.10.4, 1208.5.10.3

PE pipe or tubing . . . . . . . . . . . . . . . . . .605.6, 1208.5.4 PE-AL-PE pipe or tubing . . . . . . . . . . . . . . . . . . . .605.7 PE-RT tubing . . . . . . . . . . . . . . . . . . . . . . . . . . . . .605.8

570 2025 CALIFORNIA PLUMBING CODE

INDEX

PEX tubing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .605.9 PEX-AL-PEX pipe or tubing . . . . . . . . . . . . . . . . .605.10 Plastic piping, joints, and fittings . . . . .605.2 – 605.3.2.1,

605.6 – 605.12.3,

705.1.1 – 705.1.3,

705.5 – 705.5.1.3,

705.6 – 705.6.3,

705.10.3, 1208.5.10,

1210.1.7.1

PP piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .605.11 Prohibited fittings and practices . . . . . . . . . . . . . . . .310.0, 315.2, 604.2,

1321.8.4, 1321.12.3, 1322.7 PVC piping . . . . . . . . . . . . . . . . .605.12, 705.6, 705.9.4 Screwed joint . . . . . . . . . . . . . . . . . . . . . .310.8, 701.3.1 Slip joint . . . . . . . . . . . . . . . . . . . . . . . . . .221.0, 402.10,

605.14, 705.9.1, 1003.2 Soldered joint . . . . . . . .212.0, 605.1.4, 705.3.3, A 107.3 Solvent cement plastic pipe . . . . . . . . .605.2.2, 605.3.1,

605.12.2, 705.1.2,

705.6.2, 705.9.4 Stainless steel pipe . . . . . . . . . . . . . . .605.13, 605.16.3,

705.7, 705.10.4

Threaded joint . . . . . . . . . . . .605.1.5, 605.2.3, 605.5.2,

605.11.3, 605.12.3, 605.16.1,

705.1.3, 705.3.4, 705.4.2, 705.6.3,

705.10.2, 1208.5.8, 1208.5.9.1,

1208.5.9.5, 1322.5, A 107.3

Tightness . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .105.3 Transition joint . . . . . . . . . . . . . . . . . . . . . . . . . .705.9.4 Various materials . . . . . . . . .605.16, 705.10, 1210.1.3.8

Vitrified clay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .705.8 Welded joint . . . . . . . . . . . . . .212.0, 605.13.2, 705.7.2, 1208.5.9.1, 1322.1, F 1101.2

– L –

LABELED . . . . . . . . . . . . . . . . . . . . . . . . . . . . .214.0, 301.2

LAUNDRY SINKS . . . . . . . . . . . . . . . . . . . . . . . . . . . .1001.2

LAVATORIES . . . . . . . . . . . . . . . .407.0, 422.9, Table 702.1,

1503.8.2.1, E 501.4

LAVATORIES IN SETS . . . . . . . . . . . . . .214.0, Table 702.1

LAVATORY

Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 214.0

LAVATORY FAUCETS

Common and public use areas . . . . . . . . . . . . . .407.2.3 Maximum flow rate . . . . . . . . . . . . . . . . .407.2.1, 407.2.2

Metering faucet . . . . . . . . . . . . . . . . . . . . . . . . . .407.2.4

Public . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .407.2.1

Residential . . . . . . . . . . . . . . . . . . . . . . . . . . . . .407.2.2

LAWN SPRINKLERS . . . . . . . . .Table 610.3, Table A 103.1,

A 103.2, M 102.5

LEAD

Allowable lead contents . . . . . . . . . . . . . .604.2, 604.2.1

Bends and traps . . . . . . . . . . . . . . . . . . . . .701.5, 906.6 Closet rings . . . . . . . . . . . . . . . . . . . . . . . . . . . .402.6.1

Flashing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1102.3.1

Roof drains . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1102.1

Sheet . . . . . . . . . . . . . . . . . . . . . . .408.8.3, 701.5, 906.6

Water supply . . . . . . . . . . . . . . . . . . . . . .604.2, 604.2.1

LEADERS

Cleanouts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1101.13

Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .214.0

Installed outside . . . . . . . . . . . . . . . . . . . . . . . . .1101.4.3

Leaders, conductors, and connections . . . . . . . .1101.16 Roof drainage . . . . . . . . . . . . . . . . . . . . . . . . . . .1101.12 Size of leaders, conductors, and

storm drains . . . . . . . . . . . . . . . . . . . . . . . . . . .1103.0

Sizing roof drains, leaders, and vertical rainwater piping . . . . . . . . . . . . .Table 1103.1 Traps on storm drains and leaders . . . . . . . . . . .1101.15

LIMITED-DENSITY OWNER-BUILT

RURAL DWELLING

Connections to plumbing system . . . . . . . . . . . . . .304.1

Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .214.0

Disposal of liquid waste . . . . . . . . . . . . . . . . . . . . .303.1 Water supply and flushing . . . . . . . . . . . . . . . . . . .601.2 LIQUEFIED PETROLEUM

GAS (LP-GAS) . . . . . . . . . . . . . . . 214.0, 1202.1, 1208.4.1,

1208.5.6.3, 1208.5.10.4,

1212.11, E 401.2,

E 403.1, E 403.10

LIQUID WASTES . . . . . . . . . . . . . . . . .214.0, 303.0, L 302.0

LISTED . . . . . . . . . . . . . . . . . . . . . . . .214.0, 301.2, 402.6.2,

501.1

LISTING AGENCY . . . . . . . . . . . . . . . . . . . . . . .214.0, 301.2

LOCATION OF

Backwater valves . . . . . . . . .710.1, 710.3, 710.4, 710.6,

1006.0, 1101.6.4, 1503.2.3,

1503.9.1, 1503.9.7

Fixtures . . . . . . . . . . . . . . . . . . . . . . . . . . . .308.0, 402.0

Fuel gas meters . . . . . . . . . . . . . . . . .1208.7 – 1208.7.3,

E 402.4 – E 402.4.2

Fuel gas valves . . . . . . . . . . . . . . . . .1210.9 – 1210.9.4, 1212.5.3, 1212.6, E 402.3

Interceptors and separators . . . . . . . . . . . .1009.3, 1009.5 Medical gas and medical vacuum system valves . . . . . . . . . . . .1314.0 Plumbing system or sewer on lot . . . . . . . .307.0, 721.1,

Table 721.1

Private sewage disposal system . . . . . . . . . . . . .H 101.8 Water heaters . . . . . . . . . .504.1, 504.3 – 504.6, 506.3,

507.2, 507.5, 507.10,

507.12 – 507.15, 507.24,

507.25, 507.26

LOT, DEFINITION . . . . . . . . . . . . . . . . . . . . . . . . . . . . .214.0

LOW HAZARD . . . . . . . . . . . . . . . . . . . . .214.0, Table 603.2

LOW VOC CEMENT, DEFINITION . . . . . . . . . . . . . . . . . 214.0

LOW VOC ONE-STEP

CEMENT, DEFINITION . . . . . . . . . . . . . . . . . . . . . . . 214.0

LOW VOC PRIMER, DEFINITION . . . . . . . . . . . . . . . . . 214.0

INDEX

– M –

MACERATING TOILET SYSTEMS . . . . . . . . .215.0, 710.13

MAIN, DEFINITION . . . . . . . . . . . . . . . . . . . . . . . . . . .215.0 MAINTENANCE . . . . . . . . . .102.2, 102.3, 1009.6, 1014.1.2,

1501.5, Table 1501.5, 1501.6,

1504.6.4, 1504.11, 1505.16,

Table 1505.16, 1601.5, Table 1601.5,

1601.5.1, K 101.5, K 101.5.1,

Table K 104.3.3, L 501.5,

L 504.2

MALLEABLE IRON . . . . . . . . .604.7, Table 604.1, Table 701.2

MANUFACTURED/MOBILE

HOME PARKS AND

RECREATIONAL VEHICLE PARKS . . . . . . . .Appendix E MARKINGS . . . . . . . . . . . . . . . . . . . . . . .(see Identification)

MATERIALS

Alternate . . . . . . . . . . . . . . . . . . . . . . . . .301.3, H 501.13

Approval required . . . . . . . . . . . . . . . . . . . . . . . . . .301.2 Approved standards . . . . . . . . . . . . . . . . . . . . . .301.2.2 Backwater, gate, or ball valves . . . . . . . . . . . . . . .710.6 Building drains . . . . . . . . . . . . . . . . . . . . . . .Table 701.2 Building sewers . . . . . . . . . . . .Table 701.2, 715.1, 720.0 Cesspools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .H 801.0

Cleanouts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .707.1

Drainage piping, joints, and fittings . . . . . . . . . . . . . . . . . . .701.2, Table 701.2, 701.3, 705.0

Fuel gas piping, joints, and fittings . . . . . . . . . . . . . . . . . . . .1208.5, 1208.5.1,

1208.5.3 – 1208.5.4,

1208.5.9, 1208.5.10, 1208.5.11

Marking of . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .301.2.1 Medical gas and medical vacuum . . . . . . . . . . . .1318.0 Potable water piping, joints, and fittings . . . . . . . . . . . . . . . . . . . .604.0, 605.0 Rainwater catchment system . . . . . .1602.7, Appendix K Septic tanks . . . . . . . . . . . . . . . . . . . . . . . . . . . .H 501.3 Storm drainage pipe . . . . . . . . . . . . . . . . . . . . . . .1101.4

Subsoil drain . . . . . . . . . . . . . . . . . . . . . . . . . . .1101.4.6

Sumps or receiving tanks . . . . . . . . . . . . . . . . . . .710.8 Traps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1003.1 Vents (DWV) . . . . . . . . . . . . . . . . . . .Table 701.2, 903.0 MAY, DEFINITION . . . . . . . . . . . . . . . . . . . . . . . . . . . .215.0

MEAT AND POULTRY

PROCESSING PLANTS . . . . . . . . . . . .601.5, 724.0, 1010.2

MEAT PACKING AND SLAUGHTERHOUSES . . . . .1010.0

MEDICAL GAS AND MEDICAL

VACUUM SYSTEMS . . . . . . . . . . . . . . . . . . . .Chapter 13

Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1324.4

Aspirators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1303.5 Category 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .205.0 Category 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .205.0 Category 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .205.0 Category 4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .205.0 Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1318.2

Construction documents . . . . . . . . . . . . . . . . . . .1304.3

Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .215.0

Health Care Facilities (OSHPD) . . . . . . . . . . . .1304.1.1 Installation requirements . . . . . . . . . . . .1304.0, 1323.0

Joints and connections . . . . . . . . . . . . . . . . . . . .1320.0

Labeling and identification . . . . . . . . . . . . . . . . .1323.13

Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1318.0

Medical air systems . . . . . . . . . . . . . . . . . . . . . . .1312.0 Medical vacuum systems . . . . . . . . . . . . . . . . . . .1319.0 Pipe sizing . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1323.1, Table 1323.1.4(1) – Table 1323.1.4(6) Pressure-regulating equipment . . . . .1308.0, 1321.10.2

Shutoff valves . . . . . . . . . . . . . . . . . . . . . . . . . . .1318.1

Source System . . . . . . . . . . . . . . . . . . . . . . . . .1304.1.2 Station outlets/inlets . . . . . . . . . . . . . . . . . . . . . .1305.3,

1314.10, 1315.0

Sterilizers and bedpan steamers . . . . . . . . . . . . .1303.4 System certification . . . . . . . . . . . . . . . . . . . . . . .1306.0 Testing and inspection . . . . . . . . . . . . . . . . . . . . .1324.0 Warning system . . . . . . . . . . . . . . . . . . . . . . . . . .1317.0 METALS, INTERMIXING PROHIBITED . . . . . .310.6, 604.1

METER, DEFINITION . . . . . . . . . . . . . . . . . . . . . . . . . . 215.0

METERING FAUCETS . . . . . . . . . . .407.2.4, 407.2.4.1, 417.1.2

MID-STORY GUIDE, DEFINITION . . . . . . . . . . . . . . . .215.0

MINIMUM STANDARDS . . . . . . . . . . . . . . . . . . . . . . . .301.2

MINIMUM PLUMBING

FACILITIES . . . . . . . . . . . . . . . . . .Table 422.1, Table 4-2,

Table 4-3, Table 4-4

MULCH, DEFINITION . . . . . . . . . . . . . . . . . . . . . . . . .215.0

MULCH BASIN

Construction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1504.5

Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .215.0

Gray water systems . . . . . . . . . . . . . . . . 1504.5 – 1504.5.1

Groundwater . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1504.4

Material . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1504.5.1

Size . . . . . . . . . . . . . . . . . . .1504.2, Table 1504.2, 1504.3

Soil type . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Table 1504.2

– N –

NATURAL GAS, SPECIFIC GRAVITY . . . . . . . . . . . .1214.1

NITROGEN NF, DEFINITION . . . . . . . . . . . . . . . . . . . .216.0

NONCOMBUSTIBLE PIPING INSTALLATIONS . . . .1405.0

NONPOTABLE WATER

Alternate water source . . . . . . . . . . . . . . . . .Chapter 15

Disinfection . . . . . . . . . . . . . . . . . . . . . . . . . . .1506.10.6

Identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .601.3

Rainwater catchment system . . . . . . . . . . . .Chapter 16 Unlawful connections to . . . . . . . . . . .603.5.11, E 502.3

NONWATER SUPPLIED URINAL,

DEFINITION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 216.0

NONWATER URINALS

Drain cleansing action . . . . . . . . . . . . . 412.1.4, 412.1.4.1 Requirements . . . . . . . . . . . . . . . . . . . 412.1.3, L 402.3.1 NUISANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . .102.5, 216.0

572 2025 CALIFORNIA PLUMBING CODE

INDEX

– O –

OBSTRUCTIONS

OF FLOW . . . . . . . . . . . . . . . . . . . . . . . . . . . .310.5, 315.2

OCCUPANT LOAD FACTOR (BSC, DSA) . . . . . . . .Table 4-1

OFFSETS

Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .217.0

Drainage . . . . . . . . . . . . . .706.4, C 304.3.1, C 304.3.2, C 304.4, C 401.4, C 601.7

Medical gas . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1320.2

Prohibited use . . . . . . . . . . . . . . . . . . . . . . . . . . .402.6.3

Venting (fuel gas) . . . . . . . . . . . . . . .509.6.2.2, 510.1.2,

510.2.4, 510.2.16 Venting (plumbing) . . . . . . . . . . . . . . . . . . . . . . . .910.5

OIL AND FLAMMABLE INTERCEPTORS . . . . . . . . .1017.0

ONE- AND TWO-FAMILY DWELLINGS . . . . . . . . . . . . .301.7

ON-SITE TREATED NONPOTABLE

WATER SYSTEMS

Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .217.0

Minimum water quality requirements . . . . . . . . . .1501.7 Operation and maintenance manual . . . . . . . . . .1501.6 Signage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .601.3.3

ON-SITE TREATED NONPOTABLE

GRAY WATER SYSTEMS . . . . . . . . . . . . . . . . . . . . . .1506.0

Color and marking information . . . . . . . . . . . . . .1506.8 Connections to other systems . . . . . . . . . . . . . . .1503.3 Devices and systems . . . . . . . . . . . . . . . . . . . . . .1506.7

Disinfection . . . . . . . . . . . . . . . . . . . . . . . . . . .1506.10.6

Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1506.6

Minimum water quality requirements . . . . . . . . . .1501.7 Operation and maintenance manual . . . . . . . . . .1501.6 Signage . . . . . . . . . . . . . . . . .601.3.3, 1501.9 – 1501.9.2,