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Earlier editions: 20222019

Chapter 6 — WATER SUPPLY AND DISTRIBUTION

603.5 Specific Requirements. Specific requirements for

California Plumbing Code (Title 24, Part 5) · 2025 edition · updated 2026-09-10 · California

Italicized text is a California amendment to the model code, as printed in the official publication.

backflow prevention shall comply with Section 603.5.1 through Section 603.5.22. 603.5.1 Atmospheric Vacuum Breaker. Water closet and urinal flushometer valves shall be protected against backflow by an approved backflow prevention assembly, device, or method. Where the valves are equipped with an atmospheric vacuum breaker, the vacuum breaker shall be installed on the discharge side of the flushometer valve with the critical level not less than 6 inches (152 mm), or the distance according to its listing, above the overflow rim of a water closet bowl or the highest part of a urinal.

603.5.2 Ballcock. Water closet and urinal tanks shall be equipped with a ballcock. The ballcock shall be installed with the critical level not less than 1 inch (25.4 mm) above the full opening of the overflow pipe. In cases where the ballcock has no hush tube, the bottom of the water supply inlet shall be installed 1 inch (25.4 mm) above the full opening of the overflow pipe.

603.5.3 Backflow Prevention. Water closet flushometer tanks shall be protected against backflow by an approved backflow prevention assembly, device, or method.

603.5.4 Heat Exchangers. Heat exchangers used for heat transfer, heat recovery, or solar heating shall protect the potable water system from being contaminated by the

heat-transfer medium. Single-wall heat exchangers used in indirect-fired water heaters shall meet the requirements of Section 505.4.1. Double-wall heat exchangers shall separate the potable water from the heat-transfer medium by providing a space between the two walls that are vented to the atmosphere. 603.5.5 Water Supply Inlets. Water supply inlets to tanks, vats, sumps, swimming pools, and other receptors shall be protected by one of the following means:

(1) An approved air gap.

(2) A listed vacuum breaker installed on the discharge side of the last valve with the critical level not less than 6 inches (152 mm) or in accordance with its listing.

(3) A backflow preventer suitable for the degree of hazard, installed in accordance with the requirements for that type of device or assembly as set forth in this chapter. 603.5.6 Protection from Lawn Sprinklers and Irri- gation Systems. Potable water supplies to systems having no pumps or connections for pumping equipment, and no chemical injection or provisions for chemical injection, shall be protected from backflow by one of the following devices:

(1) Atmospheric vacuum breaker (AVB)

(2) Pressure vacuum breaker backflow prevention assembly (PVB)

(3) Spill-resistant pressure vacuum breaker (SVB)

(4) Reduced-pressure principle backflow prevention assembly (RP)

(5) A valve complying with IAPMO PS 72 603.5.6.1 Systems with Pumps. Where sprinkler and irrigation systems have pumps, connections for pumping equipment, or auxiliary air tanks, or are otherwise capable of creating backpressure, the potable water supply shall be protected by the following type of device where the backflow device is located upstream from the source of backpressure:

(1) Reduced-pressure principle backflow prevention assembly (RP) 603.5.6.2 Systems with Backflow Devices. Where systems have a backflow device installed downstream from a potable water supply pump or a potable water supply pump connection, the device shall be one of the following:

(1) Atmospheric vacuum breaker (AVB)

(2) Pressure vacuum breaker backflow prevention assembly (PVB)

(3) Spill-resistant pressure vacuum breaker (SVB)

(4) Reduced-pressure principle backflow prevention assembly (RP) 603.5.6.3 Systems with Chemical Injectors. Where systems include a chemical injector or provisions for chemical injection, the potable water supply shall be protected by a reduced-pressure principle backflow prevention assembly (RP).

WATER SUPPLY AND DISTRIBUTION

TABLE 603.2 BACKFLOW PREVENTION DEVICES, ASSEMBLIES, AND METHODS
DEGREE OF HAZARD DEGREE OF HAZARD DEGREE OF HAZARD DEGREE OF HAZARD DEGREE OF HAZARD DEGREE OF HAZARD DEGREE OF HAZARD
DEVICE, ASSEMBLY,
OR METHOD1		 APPLICABLE
STANDARDS		 POLLUTION
(LOW HAZARD)		 POLLUTION
(LOW HAZARD)		 CONTAMINATION
(HIGH HAZARD)		 CONTAMINATION
(HIGH HAZARD)		 INSTALLATION2,3
DEVICE, ASSEMBLY,
OR METHOD1		 APPLICABLE
STANDARDS		 BACK-
SIPHONAGE		 BACK-
PRESSURE		 BACK-
SIPHONAGE		 BACK-
PRESSURE		 BACK-
PRESSURE
Air gap ASME
A112.1.2		 X –– X –– See Table 603.3.1 in this chapter.
Air gap fittings for use
with plumbing fixtures,
appliances, and appurte-
nances		 ASME
A112.1.3		 X –– X –– Air gap fitting is a device with an internal air
gap, and typical installation includes
plumbing fixtures, appliances, and
appurtenances. The critical level shall not be
installed below the flood level rim.
Antisiphon fill valve
(ballcocks) for gravity
water closet flush tanks
and urinal tanks		 ASSE 1002/
ASME
A112.1002/
CSA B125.12		 X –– X –– Installation of gravity water closet flush tank
and urinal tanks with the fill valve installed
with the critical level not less than 1 inch
above the opening of the overflow pipe.4,5
Atmospheric vacuum
breaker (consists of a
body, checking member
and atmospheric port)		 ASSE 1001 or
CSA B64.1.1		 X –– X –– Upright position. Have outlet open to
atmosphere. Minimum of 6 inches or listed
distance above all downstream piping and
flood level rim of receptor.4,5
Backflow preventer for
Carbonated Beverage
Dispensers (two inde-
pendent check valves
with a vent to the atmos-
phere)		 ASSE 1022 X X X X Installation includes carbonated beverage
machines or dispensers. These devices
operate under intermittent or continuous
pressure conditions.
Backflow preventer with
intermediate atmos-
pheric vent		 ASSE 1012 X X — — Installation of potable water connections to
water boilers. No high-hazard chemicals
shall be introduced into the system using
such devices. Designed to operate under con-
tinuous pressure conditions. May discharge
water.
Backflow preventer with
intermediate atmospheric
vent and pressure reduc-
ing valve		 ASSE 1081 X X — — Installation of potable water connections to
water boilers. No high-hazard chemicals
shall be introduced into the system using
such devices. Designed to operate under con-
tinuous pressure conditions. May discharge
water.
Chemical dispenser with
integral backflow protec-
tion		 ANSI/CAN/
ASSE/IAPMO
1055		 X –– X –– Shall be installed in accordance with
manufacturer’s installation instructions with
dedicated water supply whenever possible.
Dual check backflow
preventer		 ASSE 1024 X X — — Installation does not include carbonated drink
dispensers.
Dual check backflow
preventer wall hydrants,
freeze resistant		 ASSE 1053 X –– X –– Such devices are not for use under
continuous pressure conditions.4
Double Check Detector
Fire Protection Backflow
Prevention Assembly
(two independent check
valves with a parallel
detector assembly con-
sisting of a water meter
and a double check valve
backflow prevention
assembly and means for
field testing)		 ASSE 1048 X X –– –– Horizontal unless otherwise listed. Access
and clearance shall be in accordance with the
manufacturer’s instructions, and not less than
a 12 inch clearance at the bottom for mainte-
nance. May need platform/ladder for test and
repair. Does not discharge water. Installation
includes a fire protection system and is
designed to operate under continuous pres-
sure conditions.

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TABLE 603.2 BACKFLOW PREVENTION DEVICES, ASSEMBLIES, AND METHODS (continued)
DEGREE OF HAZARD DEGREE OF HAZARD DEGREE OF HAZARD DEGREE OF HAZARD DEGREE OF HAZARD DEGREE OF HAZARD DEGREE OF HAZARD
DEVICE, ASSEMBLY,
OR METHOD1		 APPLICABLE
STANDARDS		 POLLUTION
(LOW HAZARD)		 POLLUTION
(LOW HAZARD)		 CONTAMINATION
(HIGH HAZARD)		 CONTAMINATION
(HIGH HAZARD)		 INSTALLATION2,3
DEVICE, ASSEMBLY,
OR METHOD1		 APPLICABLE
STANDARDS		 BACK-
SIPHONAGE		 BACK-
PRESSURE		 BACK-
SIPHONAGE		 BACK-
PRESSURE		 BACK-
PRESSURE
Double Check Valve
Backflow Prevention
Assembly (two inde-
pendent check valves
and means of field test-
ing)		 ASSE 1015;
AWWA C510;
CSA B64.5 or
CSA B64.5.1		 X X –– –– Horizontal unless otherwise listed. Access and
clearance shall be in accordance with the man-
ufacturer’s instructions, and not less than a 12
inch clearance at the bottom for maintenance.
May need platform/ladder for test and repair.
Does not discharge water.
Freeze resistant sanitary
yard hydrants		 ASSE 1057 X –– X –– Such devices are not for use under
continuous pressure conditions.4
Hose connection back-
flow preventers		 ASSE 1052 X –– X –– Such devices are not for use under
continuous pressure conditions.4,6
Hose connection vac-
uum breakers		 ASSE 1011 X –– X –– Such devices are not for use under continuous
pressure conditions. No valve downstream.4,6
Laboratory faucet back-
flow preventer		 ASSE 1035 X –– X –– Installation includes laboratory faucets. Such
devices are not for use under continuous
pressure conditions. No valve downstream.4
Pressure Vacuum Breaker
Backflow Prevention
Assembly (loaded air
inlet valve, internally
loaded check valve and
means for field testing)		 ASSE 1020 or
CSA B64.1.2		 X –– X –– Upright position. May have valves down-
stream. Minimum of 12 inches above all
downstream piping and flood-level rim of the
receptor. May discharge water.
Reduced Pressure Detec-
tor Fire Protection Back-
flow Prevention
Assembly (two independ-
ently acting loaded check
valves, a differential pres-
sure relief valve, with a
parallel detector assembly
consisting of a water
meter and a reduced-pres-
sure principle backflow
prevention assembly, and
means for field testing)		 ASSE 1047 X X X X Horizontal unless otherwise listed. Access
and clearance shall be in accordance with the
manufacturer’s instructions, and not less than
a 12 inch clearance at the bottom for mainte-
nance. May need platform/ladder for test and
repair. May discharge water.
Installation includes a fire protection system
and is designed to operate under continuous
pressure conditions.
Reduced Pressure Princi-
ple Backflow Prevention
Assembly (two independ-
ently acting loaded check
valves, a differential pres-
sure relief valve and
means for field testing)		 ASSE 1013;
AWWA C511;
CSA B64.4 or
CSA B64.4.1		 X X X X Horizontal unless otherwise listed. Access
and clearance shall be in accordance with the
manufacturer’s instructions, and not less than
a 12 inch clearance at the bottom for mainte-
nance. May need platform/ladder for test and
repair. May discharge water.
Spill-Resistant Pressure
Vacuum Breaker (single
check valve with air
inlet vent and means of
field testing)		 ASSE 1056 X –– X –– Upright position. Minimum of 12 inches or
listed distance above all downstream piping
and flood-level rim of receptor.5
Vacuum breaker wall
hydrants, hose bibbs,
freeze resistant, auto-
matic draining type		 ASSE 1019 or
CSA B64.2.1.1		 X –– X –– Installation includes wall hydrants and hose
bibbs. Such devices are not for use under con-
tinuous pressure conditions (means of shutoff
downstream of device is prohibited).4,5

For SI units: 1 inch = 25.4 mm

Notes: 1 See the description of devices and assemblies in this chapter. 2 Installation in pit or vault requires previous approval by the Authority Having Jurisdiction. 3 Refer to the general and specific requirement for installation. 4 Not to be subjected to operating pressure for more than 12 hours in a 24-hour period. 5 For deck-mounted and equipment-mounted vacuum breaker, see Section 603.5.13. 6 Shall be installed in accordance with Section 603.5.7.

WATER SUPPLY AND DISTRIBUTION

TABLE 603.3.1 MINIMUM AIR GAPS FOR WATER DISTRIBUTION [4]

FIXTURES WHERE NOT AFFECTED BY SIDEWALLS1
(inches)		 WHERE AFFECTED BY SIDEWALLS2
(inches)
Effective openings3 not greater than1⁄2 of an inch in diameter 1 11⁄2
Effective openings3 not greater than3⁄4 of an inch in diameter 11⁄2 21⁄4
Effective openings3 not greater than 1 inch in diameter 2 3
Effective openings3 greater than 1 inch in diameter Two times the diameter of
effective opening		 Three times the diameter of
effective opening

For SI units: 1 inch = 25.4 mm

Notes: 1 Sidewalls, ribs, or similar obstructions do not affect air gaps where spaced from the inside edge of the spout opening a distance exceeding three times the diameter of the effective opening for a single wall, or a distance exceeding four times the effective opening for two intersecting walls. 2 Vertical walls, ribs, or similar obstructions extending from the water surface to or above the horizontal plane of the spout opening other than specified in Footnote 1 above. The effect of three or more such vertical walls or ribs has not been determined. In such cases, the air gap shall be measured from the top of the wall. 3 The effective opening shall be the minimum cross-sectional area at the seat of the control valve or the supply pipe or tubing that feeds the device or outlet. Where two or more lines supply one outlet, the effective opening shall be the sum of the cross-sectional areas of the individual supply lines or the area of the single outlet, whichever is smaller. 4 Air gaps less than 1 inch (25.4 mm) shall be approved as a permanent part of a listed assembly that has been tested under actual backflow conditions with vacuums of 0 to 25 inches of mercury (85 kPa).

Where two or more lines supply one outlet, the effective opening shall be the sum of the cross-sectional areas of the individual supply lines or the area of the single outlet, whichever is smaller. 4 Air gaps less than 1 inch (25.4 mm) shall be approved as a permanent part of a listed assembly that has been tested under actual backflow conditions with vacuums of 0 to 25 inches of mercury (85 kPa).

603.5.7 Outlets with Hose Attachments. Potable water outlets with hose attachments, other than water heater drains, boiler drains, and clothes washer connections, shall be protected by a nonremovable hose bibbtype backflow preventer, a nonremovable hose bibb-type vacuum breaker, or by an atmospheric vacuum breaker installed not less than 6 inches (152 mm) above the highest point of usage located on the discharge side of the last valve. In climates where freezing temperatures occur, a listed self-draining frost-proof hose bibb with an integral backflow preventer or vacuum breaker shall be used. 603.5.8 Water-Cooled Equipment. Water-cooled compressors, degreasers, or other water-cooled equipment shall be protected by a backflow preventer installed in accordance with the requirements of this chapter. Water-cooled equipment that produces backpressure shall be equipped with the appropriate protection. 603.5.9 Aspirators. Water inlets to water-supplied aspirators shall be equipped with a vacuum breaker installed in accordance with its listing requirements and this chapter. The discharge shall drain through an air gap. Where the tailpiece of a fixture to receive the discharge of an aspirator is used, the air gap shall be located above the flood-level rim of the fixture.

603.5.10 Steam or Hot Water Boilers. Potable water connections to steam or hot water boilers shall be protected from backflow by a double check valve backflow prevention assembly, backflow preventer with intermediate atmospheric vent and pressure reducing valve, or reduced pressure principle backflow prevention assembly in accordance with Table 603.2. Where chemicals are introduced into the system a reduced pressure principle backflow prevention assembly shall be provided in accordance with Table 603.2.

603.5.11 Nonpotable Water Piping. In cases where it is impractical to correct individual cross-connections on the domestic waterline, the line supplying such outlets

shall be considered a nonpotable water line. No drinking or domestic water outlets shall be connected to the nonpotable waterline. Where possible, portions of the nonpotable waterline shall be exposed, and exposed portions shall be properly identified in a manner satisfactory to the Authority Having Jurisdiction. Each outlet on the nonpotable waterline that is permitted to be used for drinking or domestic purposes shall be posted: “CAUTION: NONPOTABLE WATER, DO NOT DRINK.”

[HCD 1 & HCD 2] An international symbol of a glass in a circle with a slash through it shall be provided sim- ilar to that shown in Figure 601.

603.5.12 Beverage Dispensers. Potable water supply to carbonated beverage dispensers shall be protected by an air gap or a vented backflow preventer that complies with ASSE 1022. For carbonated beverage dispensers, piping material installed downstream of the backflow preventer shall not be affected by carbon dioxide gas. Non-carbonated beverage dispensers, such as ice makers and coffee machines, shall be protected by an air gap or dual check backflow preventer that comply with ASSE 1032 or ASSE 1024.

603.5.13 Deck-Mounted and Equipment- Mounted Vacuum Breakers. Deck-mounted or equipment-mounted vacuum breakers shall be installed in accordance with their listing and the manufacturer’s installation instructions, with the critical level not less than 1 inch (25.4 mm) above the flood-level rim.

603.5.14 Protection from Fire Systems.

Note: Fire Protection Systems has not been adopted by the State Fire Marshal. This section cannot be adopted or enforced pursuant to California Health and Safety Code 13114.7(a), which is being cited for reference. California Health and Safety Code 13114.7.

(a) For the purposes of this section the following are definitions of class I and class II systems:

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WATER SUPPLY AND DISTRIBUTION

(1) American Water Works Association [A.W.W.A] Manual No. M-14 class 1 – Automatic fire sprinkler systems with direct connection from public water mains only; no pumps, tanks, or reservoirs; no physical connection from other water supplies; no antifreeze or additives of any kind; and all sprinkler drains discharging to the atmosphere or other safe outlets.

(2) American Water Works Association [A.W.W.A] Manual No. M-14 class 2 – Automatic fire sprinkler systems which are the same as class 1, except that booster pumps may be installed in the connections from the street mains.

(b) Automatic fire sprinkler systems described in subdi- vision (a) shall not require any backflow protection equipment at the service connection other than required by standards for those systems contained in the publication of the National Fire Protection Association entitled “Installation of Sprinkler Sys- tems” [NFPA Pamphlet No. 13, 1980 edition]. 603.5.14.1 Fire Department Connection. Where fire protection systems supplied from a potable water system include a fire department (siamese) connection that is located less than 1700 feet (518.2 m) from a nonpotable water source that is capable of being used by the fire department as a secondary water supply, the potable water supply shall be protected by one of the following:

(1) Reduced pressure principle backflow prevention assembly (RP)

(2) Reduced pressure detector fire protection backflow prevention assembly

Nonpotable water sources include fire department vehicles carrying water of questionable quality or water that is treated with antifreeze, corrosion inhibitors, or extinguishing agents. 603.5.14.2 Chemicals. Where antifreeze, corrosion inhibitors, or other chemicals are added to a fire protection system supplied from a potable water supply, the potable water system shall be protected by one of the following:

(1) Reduced pressure principle backflow prevention assembly (RP)

(2) Reduced pressure detector fire protection backflow prevention assembly 603.5.14.3 Hydraulic Design. Where a backflow device is installed in the potable water supply to a fire protection system, the hydraulic design of the system shall account for the pressure drop through the backflow device. Where such devices are retrofitted for an existing fire protection system, the hydraulics of the sprinkler system design shall be checked to verify that there will be sufficient water pressure available for satisfactory operation of the fire sprinklers. 603.5.15 Health Care or Laboratory Areas. Vacuum breakers for washer-hose bedpans shall be located not less than 5 feet (1524 mm) above the floor. Hose con

nections in health care or laboratory areas shall be not less than 6 feet (1829 mm) above the floor. 603.5.16 Special Equipment. Portable cleaning equipment and dental vacuum pumps shall be protected from backflow by an air gap, an atmospheric vacuum breaker, a spill-resistant vacuum breaker, or a reduced pressure principle backflow preventer.

603.5.17 Potable Water Outlets and Valves. Potable water outlets, freeze-proof yard hydrants, combination stop-and-waste valves, or other fixtures that incorporate a stop and waste feature that drains into the ground shall not be installed underground. 603.5.18 Pure Water Process Systems. The water supply to a pure water process system, such as dialysis water systems, semiconductor washing systems, and similar process piping systems, shall be protected from backpressure and backsiphonage by a reduced-pressure principle backflow preventer. 603.5.18.1 Dialysis Water Systems. The individual connections of the dialysis related equipment to the dialysis pure water system shall not require additional backflow protection. 603.5.19 Garbage Can Washers. Where garbage can washers are connected to a potable water supply system, the connection shall be protected against backflow in accordance with Table 603.2.

603.5.20 Plumbing Fixture Fittings. Plumbing fixture fittings with integral backflow protection shall comply with ASME A112.18.1/CSA B125.1. 603.5.21 Swimming Pools, Spas, and Hot Tubs. Potable water supply to swimming pools, spas, and hot tubs shall be protected by an air gap or a reduced pressure principle backflow preventer in accordance with the following:

(1) The unit is equipped with a submerged fill line.

(2) The potable water supply is directly connected to the unit circulation system. 603.5.22 Chemical Dispensers. The water supply to chemical dispensers shall be protected against backflow by one of the following:

(1) The chemical dispenser shall comply with ANSI/CAN/ASSE/IAPMO 1055. Where an installation involves a water source coming from a faucet with an integrated vacuum breaker device, a pressure bleed device conforming to IAPMO PS 104 shall be used to protect the vacuum breaker device.

(2) Water supply shall be protected by one of the following methods:

(a) Air gap

(b) Atmospheric vacuum breaker (AVB)

(c) Pressure vacuum breaker backflow prevention assembly (PVB)

(d) Spill-resistant pressure vacuum breaker (SVB)

(e) Reduced-pressure principle backflow prevention assembly (RP)

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▸Contents — California Plumbing Code (Title 24, Part 5)
California Plumbing Code (Title 24, Part 5)
  1. Chapter 1 — GENERAL CODE PROVISIONS
  2. Chapter 2 — DEFINITIONS
  3. Chapter 3 — GENERAL REGULATIONS
  4. Chapter 4 — PLUMBING FIXTURES AND FIXTURE FITTINGS
  5. Chapter 5 — WATER HEATERS
  6. ▸Chapter 6 — WATER SUPPLY AND DISTRIBUTION
    Overview
    1. 601.1 Applicability. This chapter shall govern the materials,
    2. 601.2 Water Supply and Flushing. Each plumbing fixture shall b…
    3. 601.3 Identification of a Potable and Nonpotable
    4. 601.4 Schools of Cosmetology and Cosmetological
    5. 601.5 Meat and Poultry Processing Plants. [AGR]
    6. 601.6 Collection Centers and Facilities. [AGR]
    7. 601.7 Renderers. [AGR] This area shall be provided with
    8. 601.8 Horse Meat and Pet Food Establishments. [AGR]
    9. 602.1 Prohibited Installation. No installation of potable
    10. 602.2 Cross-Contamination. No person shall make a connection o…
    11. 602.3 Backflow Prevention. No plumbing fixture, device,
    12. 602.4 Approval by Authority. No water piping supplied
    13. 603.1 General. Cross-connection control shall be provided
    14. 603.2 Approval of Devices or Assemblies. Before a
    15. 603.3 Backflow Prevention Devices, Assemblies, and
    16. 603.4 General Requirements. Assemblies shall comply
    17. 603.5 Specific Requirements. Specific requirements for
    18. 604.1 Pipe, Tube, and Fittings. Pipe, tube, fittings, solvent …
    19. 604.2 Lead Content. The maximum allowable lead content
    20. 604.3 Copper or Copper Alloy Tube. Copper or copper
    21. 604.4 Hard-Drawn Copper or Copper Alloy Tubing.
    22. 604.5 Flexible Connectors. Flexible water connectors
    23. 604.6 Cast-Iron Fittings. Cast-iron fittings up to and
    24. 604.7 Malleable Iron Fittings. Malleable iron water fittings s…
    25. 604.8 Previously Used Piping and Tubing. Piping and
    26. 604.9 Epoxy Coating. The epoxy coating used on existing, under…
    27. 604.10 Plastic Materials. Approved plastic materials shall
    28. 604.11 Solder. Solder shall comply with the requirements of
    29. 604.12 Flexible Corrugated Connectors. Flexible corrugated con…
    30. 604.13 Water Heater Connectors. Flexible metallic (copper and …
    31. 605.1 Copper or Copper Alloy Pipe, Tubing, and
    32. 605.2 CPVC Plastic Pipe and Joints. CPVC plastic pipe
    33. 605.3 CPVC/AL/CPVC Plastic Pipe and Joints. Chlorinated polyvi…
    34. 605.4 Ductile Iron Pipe and Joints. Ductile iron pipe
    35. 605.5 Galvanized Steel Pipe and Joints. Galvanized
    36. 605.6 PE Plastic Pipe/Tubing and Joints. PE plastic
    37. 605.7 PE-AL-PE Plastic Pipe/Tubing and Joints. PEAL-PE plastic…
    38. 605.8 PE-RT. Polyethylene of raised temperature (PE-RT)
    39. 605.9 PEX Plastic Tubing and Joints. PEX plastic tubing and fi…
    40. 605.10 PEX-AL-PEX Plastic Tubing and Joints. PEXAL-PEX plastic…
    41. 605.11 Polypropylene (PP) Piping and Joints. PP pipe
    42. 605.12 PVC Plastic Pipe and Joints. PVC plastic pipe
    43. 605.13 Stainless Steel Pipe and Joints. Joining methods for st…
    44. 605.14 Slip Joints. In water piping, slip joints shall be perm…
    45. 605.15 Dielectric Unions. Dielectric unions where installed
    46. 605.16 Joints Between Various Materials. Joints
    47. 606.1 General. Valves up to and including 2 inches (50
    48. 606.2 Fullway Valve. A fullway valve controlling outlets
    49. 606.3 Multidwelling Units. In multidwelling units, one or
    50. 606.4 Multiple Openings. Valves used to control two or
    51. 606.5 Control Valve. A control valve shall be installed
    52. 606.6 Accessible. Required shutoff or control valves shall
    53. 606.7 Multiple Fixtures. A single control valve shall be
    54. 606.8 [OSHPD 1, 1R, 2, 3, 4 & 5] Each riser or branch
    55. 606.9 Check Valve Required. All systems that circulate
    56. 606.10 Leak Detection Devices. Where leak detection
    57. 607.1 General. Potable water supply tanks shall be installed in
    58. 607.2 Private Well Water Tanks. Pressurized potable water
    59. 607.3 Potable Water Tanks. Potable water supply tanks,
    60. 607.4 Venting. Tanks used for potable water shall be tightly
    61. 607.5 Overflow. Tanks shall have not less than a 16 square
    62. 607.6 Valves. Pressurized tanks shall be provided with a listed
    63. 608.1 Inadequate Water Pressure. Where the water pressure in t…
    64. 608.2 Excessive Water Pressure. Where static water
    65. 608.3 Expansion Tanks, and Combination Tempera-
    66. 608.4 Pressure Relief Valves. Each pressure relief valve
    67. 608.5 Discharge Piping. The discharge piping serving a
    68. 608.6 Water-Heating Devices. A water-heating device
    69. 608.7 Vacuum Relief Valves. Where a hot-water storage
    70. 609.1 Installation. Water piping shall be adequately supported…
    71. 609.2 Trenches. Water pipes shall not be run or laid in the
    72. 609.3 Under Concrete Slab. Water piping installed within
    73. 609.4 Testing. Upon completion of a section or of the entire
    74. 609.5 Unions. Unions shall be installed in the water supply
    75. 609.6 Location. Except as provided in Section 609.7, no
    76. 609.7 Abutting Lot. Nothing contained in this code shall
    77. 609.8 Pumps. Pumps shall be installed in accordance with
    78. 609.9 Low-Pressure Cutoff Required on Booster
    79. 609.10 Disinfection of Potable Water System. New or
    80. 609.11 Water Hammer. [Not adopted by HCD] Building
    81. 609.12 Pipe Insulation. Insulation of domestic hot water
    82. 610.1 Size. The size of each water meter and each potable
    83. 610.2 Pressure Loss. Where a water filter, water softener,
    84. 610.3 Quantity of Water. The quantity of water required to be
    85. 610.4 Sizing Water Supply and Distribution Systems.
    86. 610.5 Sizing per Appendices A, C, and M . Except as
    87. 610.6 Friction and Pressure Loss. Except where the type
    88. 610.7 Conditions for Using Table 610.4. On a proposed
    89. 610.8 Size of Meter and Building Supply Pipe Using
    90. 610.9 Size of Branches. Where Table 610.4 is used, the minimum…
    91. 610.10 Sizing for Flushometer Valves. Where using
    92. 610.11 Sizing Systems for Flushometer Tanks. The size
    93. 610.12 Sizing for Velocity. Water piping systems shall not
    94. 610.13 Exceptions. The provisions of this section relative
    95. 611.1 Application. Drinking water treatment units shall
    96. 611.2 Air Gap Discharge. Discharge from drinking water
    97. 611.3 Connection Tubing. The tubing to and from drinking water…
    98. 611.4 Sizing of Residential Softeners. Residential-use
    99. 612.1 Installation. Residential Sprinkler Systems shall be
    100. 613.1 The domestic water-heating equipment and distribu-
    101. 613.2 At least two pieces of hot-water-heating equipment shall
    102. 613.3 Instantaneous heaters are permitted for supplying hot
    103. 613.4 Water storage tanks shall be fabricated of corrosion-
    104. 613.5 Temperature control valves shall be provided to auto-
    105. 613.6 Hot-water distribution system serving patient care areas
    106. 613.7 At fixtures where water exceeding 125°F (52°C) is acces-
    107. 613.8 Sectionalizing valves shall be provided as required by
    108. 613.9 Hot water distribution shall include test ports and valved
    109. 614.1 Dialysis water feedlines shall be CPVC (chlorinated
    110. 614.2 All piping for multistation or central dialysis units sh…
    111. 614.3 All valves shall be located in accessible locations.
    112. 614.4 Piping and valves shall be identified according to their
    113. 614.5 A means of preventing backwashing or flushing of the
    114. 614.6 A continuous audible alarm shall sound at the nurses’
    115. 614.7 Water treatment equipment and water used for dialysis
    116. 614.8 A diagram of all piping as installed shall be posted at …
    117. 615.1 Uses Not Permitted.
    118. 615.2 [OSHPD 1, 1R, 2, 3, 4 & 5] Non-potable water sys-
    119. 615.3 [OSHPD 1, 1R, 2, 3, 4 & 5] Outlets for non-potable
    120. 616.1 For new acute care hospital buildings submitted after
    121. 616.2 The emergency supply of water shall be provided at ade-
    122. 616.3 Storage tank connections and circulation shall be
  7. Chapter 7 — SANITARY DRAINAGE
  8. Chapter 8 — INDIRECT WASTES
  9. Chapter 9 — VENTS
  10. Chapter 10 — TRAPS AND INTERCEPTORS
  11. Chapter 11 — STORM DRAINAGE
  12. Chapter 12 — FUEL GAS PIPING
  13. Chapter 13 — HEALTH CARE FACILITIES AND MEDICAL GAS AND MEDICA…
  14. Chapter 14 — FIRESTOP PROTECTION
  15. Chapter 15 — ALTERNATE WATER SOURCES FOR NONPOTABLE APPLICATIONS
  16. Chapter 16 — NONPOTABLE RAINWATER CATCHMENT SYSTEMS
  17. Chapter 17 — REFERENCED STANDARDS
  18. Appendix A — RECOMMENDED RULES FOR SIZING THE WATER SUPPLY SYS…
  19. Appendix B — EXPLANATORY NOTES ON COMBINATION WASTE AND VENT S…
  20. Appendix C — ALTERNATE PLUMBING SYSTEMS
  21. Appendix D — SIZING STORM WATER DRAINAGE SYSTEMS
  22. Appendix E — MANUFACTURED/MOBILE HOME PARKS AND RECREATIONAL V…
  23. Appendix F — FIREFIGHTER BREATHING AIR REPLENISHMENT SYSTEMS
  24. Appendix G — SIZING OF VENTING SYSTEMS
  25. Appendix H — PRIVATE SEWAGE DISPOSAL SYSTEMS
  26. Appendix I — INSTALLATION STANDARDS
  27. Appendix J — COMBINATION OF INDOOR AND OUTDOOR COMBUSTION AND …
  28. Appendix K — POTABLE RAINWATER CATCHMENT SYSTEMS
  29. Appendix L — SUSTAINABLE PRACTICES
  30. Appendix M — PEAK WATER DEMAND CALCULATOR
  31. Appendix N — IMPACT OF WATER TEMPERATURE ON THE POTENTIAL FOR …
  32. Appendix O — NON-SEWERED SANITATION SYSTEMS
  33. Appendix P — PROFESSIONAL QUALIFICATIONS
  34. Appendix Q — INDOOR HORTICULTURAL FACILITIES
  35. Appendix R — TINY HOUSES
  36. Appendix S — ONSITE STORMWATER TREATMENT SYSTEMS

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