Chapter 1 — GENERAL CODE PROVISIONS
1010.5 Draining and Plumbing . . . . . . . .197
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.
1011.0 Minimum Requirements for Auto Wash Racks . . . . . . . . . . . . .197
1011.1 General . . . . . . . . . . . . . . . . . . . . .197
1012.0 Commercial and Industrial
Laundries . . . . . . . . . . . . . . . . . . .197
1012.1 General . . . . . . . . . . . . . . . . . . . . .197
1013.0 Bottling Establishments . . . . . . . .197
1013.1 General . . . . . . . . . . . . . . . . . . . . .197
1014.0 Grease Interceptors . . . . . . . . . . .197
1014.1 General . . . . . . . . . . . . . . . . . . . . .197
1014.2 Hydromechanical Grease Interceptors . . . . . . . . . . . . . . . . . .198
Table 1014.2.1 Hydromechanical Grease Interceptor Sizing Using Gravity Flow Rates . . . . . . . . . . . .198
1014.3 Gravity Grease Interceptors . . . . .198
Table 1014.3.6 Gravity Grease Interceptor Sizing . . . . . . . . . . . . . . . . . . . . . .199
1015.0 FOG (Fats, Oils, and Greases) Disposal System . . . . . . . . . . . . . .199
1015.1 Purpose . . . . . . . . . . . . . . . . . . . .199
1015.2 Components, Materials, and Equipment . . . . . . . . . . . . . . . . . .200
1015.3 Sizing and Installation . . . . . . . . .200
1015.4 Performance . . . . . . . . . . . . . . . . .200
1016.0 Sand Interceptors . . . . . . . . . . . . .200
1016.1 Discharge . . . . . . . . . . . . . . . . . . .200
1016.2 Authority Having Jurisdiction . . . .200
1016.3 Construction and Size . . . . . . . . .200
1016.4 Separate Use . . . . . . . . . . . . . . . .200
1017.0 Oil and Flammable Liquid Interceptors . . . . . . . . . . . . . . . . . .200
1017.1 Interceptors Required . . . . . . . . . .200
1017.2 Interceptor Design Alternatives . . .200
1017.3 Interceptor Details . . . . . . . . . . . .200
1017.4 Design of Interceptors . . . . . . . . .200
CHAPTER 11 STORM DRAINAGE . . . . . . . . . .203
1101.0 General . . . . . . . . . . . . . . . . . . . . .205
1101.1 Applicability . . . . . . . . . . . . . . . . . .205
1101.2 Where Required . . . . . . . . . . . . . .205
1101.3 Storm Water Drainage to Sanitary Sewer Prohibited . . . . . .205
1101.4 Material Uses . . . . . . . . . . . . . . . .205
Table 1101.4.6 Materials for Subsoil Drainpipe and Fittings . . . . . . . . . . . . . . . . . .205
1101.5 Expansion Joints Required . . . . . .205
1101.6 Subsoil Drains . . . . . . . . . . . . . . .205
1101.7 Building Subdrains . . . . . . . . . . . .206
1101.8 Areaway Drains . . . . . . . . . . . . . .206
1101.9 Window Areaway Drains . . . . . . .206
1101.10 Filling Stations and Motor Vehicle Washing Establishments . . . . . . . . . . . . . . .206
1101.11 Paved Areas . . . . . . . . . . . . . . . . .206
1101.12 Roof Drainage . . . . . . . . . . . . . . .206
1101.13 Cleanouts . . . . . . . . . . . . . . . . . . .207
1101.14 Rainwater Sumps . . . . . . . . . . . . .207
1101.15 Traps on Storm Drains and Leaders . . . . . . . . . . . . . . . . . . . . .207
1101.16 Leaders, Conductors, and
Connections . . . . . . . . . . . . . . . . .207
1102.0 Roof Drains . . . . . . . . . . . . . . . . . .207
1102.1 Applications . . . . . . . . . . . . . . . . .207
1102.2 Dome Strainers Required . . . . . . .207
1102.3 Roof Drain Flashings . . . . . . . . . .207
1103.0 Size of Leaders, Conductors,
and Storm Drains . . . . . . . . . . . . .207
1103.1 Vertical Conductors and
Leaders . . . . . . . . . . . . . . . . . . . . .207
1103.2 Size of Horizontal Storm
Drains and Sewers . . . . . . . . . . . .207
1103.3 Size of Roof Gutters . . . . . . . . . . .207
1103.4 Side Walls Draining onto a Roof . . . . . . . . . . . . . . . . . .207
Table 1103.1 Sizing Roof Drains, Leaders, and Vertical Rainwater Piping . . .208
1104.0 Values for Continuous Flow . . . . .208
1104.1 General . . . . . . . . . . . . . . . . . . . . .208
1105.0 Controlled-Flow Roof
Drainage . . . . . . . . . . . . . . . . . . . .208
1105.1 Application . . . . . . . . . . . . . . . . . .208
Table 1105.1(1) Controlled-Flow Maximum Roof Water Depth . . . . . . . . . . . . .209
Table 1105.1(2) Distance of Scupper Bottoms Above Roof . . . . . . . . . . . . . . . . . .209
xxxviii 2025 CALIFORNIA PLUMBING CODE
TABLE OF CONTENTS
1105.2 Setback Roofs . . . . . . . . . . . . . . .209
1106.0 Engineered Storm Drainage System . . . . . . . . . . . . . . . . . . . . .209
1106.1 General . . . . . . . . . . . . . . . . . . . . .209
1106.2 Siphonic Roof Drainage Systems . . . . . . . . . . . . . . . . . . . .209
1106.3 Siphonic Roof Drains . . . . . . . . . .209
1107.0 Testing . . . . . . . . . . . . . . . . . . . . .209
1107.1 Testing Required . . . . . . . . . . . . .209
1107.2 Methods of Testing Storm Drainage Systems . . . . . . . . . . . .209
Table 1103.2 Sizing of Horizontal Rainwater Piping . . . . . . . . . . . . .210
Table 1103.3 Size of Gutters . . . . . . . . . . . . . . .211
CHAPTER 12 FUEL GAS PIPING . . . . . . . . . . .213
1201.0 General . . . . . . . . . . . . . . . . . . . . .215
1201.1 Applicability . . . . . . . . . . . . . . . . . .215
1202.0 Coverage of Piping System . . . . .215
1202.1 General . . . . . . . . . . . . . . . . . . . . .215
1202.2 Piping System Requirements . . . .215
1202.3 Applications . . . . . . . . . . . . . . . . .215
1203.0 Inspection . . . . . . . . . . . . . . . . . . .215
1203.1 Inspection Notification . . . . . . . . .215
1203.2 Excavation . . . . . . . . . . . . . . . . . .215
1203.3 Type of Inspections . . . . . . . . . . .215
1203.4 Inspection Waived . . . . . . . . . . . .216
1204.0 Certificate of Inspection . . . . . . . .216
1204.1 Issuance . . . . . . . . . . . . . . . . . . . .216
1204.2 Gas Supplier . . . . . . . . . . . . . . . . .216
1204.3 Unlawful . . . . . . . . . . . . . . . . . . . .216
1205.0 Authority to Render Gas Service . . . . . . . . . . . . . . . . . . . . .216
1205.1 Authorized Personnel . . . . . . . . . .216
1205.2 Outlets . . . . . . . . . . . . . . . . . . . . .216
1206.0 Authority to Disconnect . . . . . . . .216
1206.1 Disconnection . . . . . . . . . . . . . . . .216
1206.2 Notice . . . . . . . . . . . . . . . . . . . . . .216
1206.3 Capped Outlets . . . . . . . . . . . . . . .216
1207.0 Temporary Use of Gas . . . . . . . . .216
1207.1 General . . . . . . . . . . . . . . . . . . . . .216
1208.0 Gas Piping System Design, Materials, and Components . . . . .216
1208.1 Installation of Piping System . . . .216
1208.2 Interconnections Supplying Separate Users . . . . . . . . . . . . . . .216
1208.3 Sizing of Gas Piping Systems . . .216
Table 1208.3.1 Approximate Gas Input for Typical Appliances . . . . . . . . . . . .217
1208.4 Maximum Operating Pressure in Buildings . . . . . . . . . . . . . . . . . .217
1208.5 Acceptable Piping Materials and Joining Methods . . . . . . . . . .217
Table 1208.5.8.2 Specifications for Threading Metallic Pipe . . . . . . . . . . . . . . . . .219
1208.6 Gas Meters . . . . . . . . . . . . . . . . . .220
1208.7 Gas Pressure Regulators . . . . . . .221
1208.8 Overpressure Protection Required . . . . . . . . . . . . . . . . . . . .221
1208.9 Overpressure Protection Devices . . . . . . . . . . . . . . . . . . . . .221
1208.10 Pressure Limitation
Requirements . . . . . . . . . . . . . . . .222
1208.11 Backpressure Protection . . . . . . .222
1208.12 Low-Pressure Protection . . . . . . .222
1208.13 Shutoff Valves . . . . . . . . . . . . . . .222
1208.14 Expansion and Flexibility . . . . . . .222
1208.15 Pressure Regulator and Pressure Control Venting . . . . . . .222
Table 1208.13 Manual Gas Valve Standards . . . .223
1209.0 Excess Flow Valve . . . . . . . . . . . .223
1209.1 General . . . . . . . . . . . . . . . . . . . . .223
1210.0 Gas Piping Installation . . . . . . . . .223
1210.1 Piping Underground . . . . . . . . . . .223
1210.2 CSST Piping Systems . . . . . . . . .225
1210.3 Installation of Aboveground Piping . . . . . . . . . . . . . . . . . . . . . .225
Table 1210.3.5.1 Support of Piping . . . . . . . . . . . . .225
1210.4 Concealed Piping in Buildings . . .225
1210.5 Piping in Vertical Chases . . . . . . .226
1210.6 Gas Pipe Turns . . . . . . . . . . . . . .226
1210.7 Drips and Sediment Traps . . . . . .227
1210.8 Outlets . . . . . . . . . . . . . . . . . . . . .227
1210.9 Manual Gas Shutoff Valves . . . . .227
1210.10 Prohibited Devices . . . . . . . . . . . .227
1210.11 Systems Containing Gas-Air Mixtures Outside the
Flammable Range . . . . . . . . . . . .227
1210.12 Systems Containing Flammable Gas-Air Mixtures . . . . . . . . . . . . . .227
1211.0 Electrical Bonding and Grounding . . . . . . . . . . . . . . . . . . .229
1211.1 Pipe and Tubing Other than CSST . . . . . . . . . . . . . . . . . . . . . .229
1211.2 Bonding of CSST Gas Piping . . . .229
1211.3 Arc-Resistant Jacketed CSST . . .229
1211.4 Prohibited Use . . . . . . . . . . . . . . .229
1211.5 Lightning Protection System . . . . .229
1211.6 Electrical Circuits . . . . . . . . . . . . .229
1211.7 Electrical Connections . . . . . . . . .229
TABLE OF CONTENTS
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Ask AI about this code▸Contents — California Plumbing Code (Title 24, Part 5)
▸Chapter 1 — GENERAL CODE PROVISIONS
Overview- 301.7 One- and Two-Family Dwellings . .50
- 301.8 OSHPD 1R . . . . . . . . . . . . . . . . . . .50
- 310.14 Services/Systems and Utilities . . . .52
- 310.15 Telephone and Data
- 401.3 Water-Conserving Fixtures
- 422.8 Cosmetology . . . . . . . . . . . . . . . . .69
- 422.9 Cosmetology Establishments . . . . .69
- 422.10 Commissaries Serving Mobile
- 422.11 Employee Lavatories in
- 501.2 California Energy Code
- 601.4 Schools of Cosmetology and
- 601.5 Meat and Poultry Processing
- 601.6 Collection Centers and
- 601.7 Renderers . . . . . . . . . . . . . . . . . . .139
- 601.8 Horse Meat and Pet Food
- 615.1 Uses Not Permitted . . . . . . . . . . . . .162
- 616.0 Emergency Water Supply . . . . . . . .162
- 717.2 Meat and Poultry Processing
- 727.0 Emergency Sanitary Drainage . . .178
- 1010.2 Meat and Poultry Processing
- 1010.3 Collection Centers and
- 1010.4 Horse Meat and Pet Food
- 1010.5 Draining and Plumbing . . . . . . . .197
- 1211.8 Earthquake-Actuated Gas
- 1501.9 Signage . . . . . . . . . . . . . . . . . . . .310
- 1504.5 Irrigation, Disposal Field and
- 1504.6 Reserved . . . . . . . . . . . . . . . . . . .318
- 1504.7 Reserved . . . . . . . . . . . . . . . . . . .318
- 1505.15 Minimum Water Quality
- 1505.16 Maintenance and Inspection . . . .322
- 101.1 Title. This document shall be known as the “Uniform
- 101.2 Scope. The provisions of this code shall apply to the
- 101.3 Purpose. This code is an ordinance providing minimum req…
- 101.4 Unconstitutional. Where a section, subsection, sentence,…
- 101.5 Validity. Where a provision of this code, or the applica…
- 102.1 Conflicts Between Codes. Where the requirements
- 102.2 Existing Installations. Plumbing systems lawfully
- 102.3 Maintenance. The plumbing and drainage system,
- 102.4 Additions, Alterations, Renovations, or Repairs.
- 102.5 Health and Safety. Where compliance with the provisions …
- 102.6 Changes in Building Occupancy. Plumbing systems that are…
- 102.7 Moved Structures. Parts of the plumbing system of
- 102.8 Appendices. The provisions in the appendices are
- 103.1 General. The Authority Having Jurisdiction shall be
- 103.2 Liability. The Authority Having Jurisdiction charged
- 103.3 Applications and Permits. The Authority Having
- 103.4 Right of Entry. Where it is necessary to make an
- 104.1 Permits Required. It shall be unlawful for a person,
- 104.2 Exempt Work. A permit shall not be required for the
- 104.3 Application for Permit. To obtain a permit, the
- 104.4 Permit Issuance. The application, construction documents…
- 104.5 Fees. Fees shall be assessed in accordance with the
- 105.1 General. Plumbing systems for which a permit is
- 105.2 Required Inspections. New plumbing work and
- 105.3 Testing of Systems. Plumbing systems shall be
- 105.4 Connection to Service Utilities. No person shall
- 106.1 General. It shall be unlawful for a person, firm, or
- 106.2 Notices of Correction or Violation. Notices of
- 106.3 Penalties. A person, firm, or corporation violating a
- 106.4 Stop Orders. Where work is being done contrary to
- 106.5 Authority to Disconnect Utilities in Emergen-
- 106.6 Authority to Condemn. Where the Authority Having Jurisdi…
- 107.1 General. In order to hear and decide appeals of orders,
- 107.2 Limitations of Authority. The Board of Appeals
- Chapter 2 — DEFINITIONS
- Chapter 3 — GENERAL REGULATIONS
- Chapter 4 — PLUMBING FIXTURES AND FIXTURE FITTINGS
- Chapter 5 — WATER HEATERS
- Chapter 6 — WATER SUPPLY AND DISTRIBUTION
- Chapter 7 — SANITARY DRAINAGE
- Chapter 8 — INDIRECT WASTES
- Chapter 9 — VENTS
- Chapter 10 — TRAPS AND INTERCEPTORS
- Chapter 11 — STORM DRAINAGE
- Chapter 12 — FUEL GAS PIPING
- Chapter 13 — HEALTH CARE FACILITIES AND MEDICAL GAS AND MEDICA…
- Chapter 14 — FIRESTOP PROTECTION
- Chapter 15 — ALTERNATE WATER SOURCES FOR NONPOTABLE APPLICATIONS
- Chapter 16 — NONPOTABLE RAINWATER CATCHMENT SYSTEMS
- Chapter 17 — REFERENCED STANDARDS
- Appendix A — RECOMMENDED RULES FOR SIZING THE WATER SUPPLY SYS…
- Appendix B — EXPLANATORY NOTES ON COMBINATION WASTE AND VENT S…
- Appendix C — ALTERNATE PLUMBING SYSTEMS
- Appendix D — SIZING STORM WATER DRAINAGE SYSTEMS
- Appendix E — MANUFACTURED/MOBILE HOME PARKS AND RECREATIONAL V…
- Appendix F — FIREFIGHTER BREATHING AIR REPLENISHMENT SYSTEMS
- Appendix G — SIZING OF VENTING SYSTEMS
- Appendix H — PRIVATE SEWAGE DISPOSAL SYSTEMS
- Appendix I — INSTALLATION STANDARDS
- Appendix J — COMBINATION OF INDOOR AND OUTDOOR COMBUSTION AND …
- Appendix K — POTABLE RAINWATER CATCHMENT SYSTEMS
- Appendix L — SUSTAINABLE PRACTICES
- Appendix M — PEAK WATER DEMAND CALCULATOR
- Appendix N — IMPACT OF WATER TEMPERATURE ON THE POTENTIAL FOR …
- Appendix O — NON-SEWERED SANITATION SYSTEMS
- Appendix P — PROFESSIONAL QUALIFICATIONS
- Appendix Q — INDOOR HORTICULTURAL FACILITIES
- Appendix R — TINY HOUSES
- Appendix S — ONSITE STORMWATER TREATMENT SYSTEMS