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Earlier editions: 20222019

Chapter 1 — GENERAL CODE PROVISIONS

501.2 California Energy Code

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.

Water Heating System Requirements . . . . . . . . . . . . . . . . .83

502.0 Permits . . . . . . . . . . . . . . . . . . . . . .83

502.1 General . . . . . . . . . . . . . . . . . . . . . .83

503.0 Inspection . . . . . . . . . . . . . . . . . . . .83

503.1 Inspection of Chimneys or Vents . . .83

503.2 Final Water Heater Inspection . . . .83

504.0 Water Heater Requirements . . . . . .83

504.1 Location . . . . . . . . . . . . . . . . . . . . .83

Table 501.1(2) First Hour Rating . . . . . . . . . . . . . .83

504.2 Vent . . . . . . . . . . . . . . . . . . . . . . . .84

504.3 Clearance . . . . . . . . . . . . . . . . . . . .84

504.4 Pressure-Limiting Devices . . . . . . .84

504.5 Temperature-Limiting Devices . . . .84

504.6 Temperature, Pressure, and Vacuum Relief Devices . . . . . . . . .84

504.7 Lead Content . . . . . . . . . . . . . . . . .84

505.0 Oil-Burning and Other Water Heaters . . . . . . . . . . . . . . . . . . . . . .84

505.1 Water Heaters . . . . . . . . . . . . . . . .84

505.2 Safety Devices . . . . . . . . . . . . . . . .84

505.3 Oil-Fired Water Heaters . . . . . . . . .84

505.4 Indirect-Fired Water Heaters . . . . .84

506.0 Air for Combustion and

Ventilation . . . . . . . . . . . . . . . . . . . .84

506.1 General . . . . . . . . . . . . . . . . . . . . . .84

506.2 Indoor Combustion Air . . . . . . . . . .85

506.3 Indoor Opening Size and Location . . . . . . . . . . . . . . . . . . . . .85

506.4 Outdoor Combustion Air . . . . . . . . .85

506.5 Combination Indoor and

Outdoor Combustion Air . . . . . . . . .87

506.6 Engineered Installations . . . . . . . . .87

506.7 Mechanical Combustion Air Supply . . . . . . . . . . . . . . . . . . . . . . .87

506.8 Louvers, Grilles, and Screens . . . .87

506.9 Combustion Air Ducts . . . . . . . . . . .87

507.0 Appliance and Equipment Installation Requirements . . . . . . . .88

507.1 Dielectric Insulator . . . . . . . . . . . . .88

507.2 Seismic Provisions . . . . . . . . . . . . .88

507.3 Appliance Support . . . . . . . . . . . . .88

507.4 Ground Support . . . . . . . . . . . . . . .88

507.5 Drainage Pan . . . . . . . . . . . . . . . . .88

507.6 Added or Converted

Equipment or Appliances . . . . . . . .88

507.7 Type of Gas(es) . . . . . . . . . . . . . . .88

507.8 Safety Shutoff Devices for Unlisted LP-Gas Appliance Used Indoors . . . . . . . . . . . . . . . . .89

507.9 Use of Air or Oxygen Under Pressure . . . . . . . . . . . . . . . . . . . . .89

507.10 Protection of Gas Appliances from Fumes or Gases other

than Products of Combustion . . . . .89

507.11 Process Air . . . . . . . . . . . . . . . . . . .89

507.12 Flammable Vapors . . . . . . . . . . . . .89

507.13 Installation in Residential Garages . . . . . . . . . . . . . . . . . . . . .89

507.14 Installation in Commercial Garages . . . . . . . . . . . . . . . . . . . . .89

507.15 Installation in Aircraft Hangars . . . .89

507.16 Venting of Flue Gases . . . . . . . . . .89

507.17 Extra Device or Attachment . . . . . .89

507.18 Addition to Existing System . . . . . .89

507.19 Avoiding Strain on Gas Piping . . . .89

507.20 Gas Appliance Pressure Regulators . . . . . . . . . . . . . . . . . . .89

507.21 Bleed Lines for Diaphragm-Type Valves . . . . . . . . . . . . . . . . . . . . . . .89

TABLE OF CONTENTS

507.22 Combination of Appliances and Equipment . . . . . . . . . . . . . . . .90

507.23 Installation Instructions . . . . . . . . . .90

507.24 Protection of Outdoor

Appliances . . . . . . . . . . . . . . . . . . .90

507.25 Accessibility for Service . . . . . . . . .90

507.26 Clearance to Combustible

Materials . . . . . . . . . . . . . . . . . . . . .90

508.0 Appliances on Roofs, in Attics or Under-Floor Spaces . . . . . . . . . .90

508.1 General . . . . . . . . . . . . . . . . . . . . . .90

508.2 Installation of Appliances on Roofs . . . . . . . . . . . . . . . . . . . . .90

508.3 Appliances on Roofs . . . . . . . . . . .90

508.4 Appliances in Attics and Under-Floor Spaces . . . . . . . . . . . .91

509.0 Venting of Appliances . . . . . . . . . . .91

509.1 Listing . . . . . . . . . . . . . . . . . . . . . . .91

509.2 Connection to Venting Systems . . .91

509.3 Minimum Safe Performance . . . . . .91

509.4 Type of Venting System to be Used . . . . . . . . . . . . . . . . . . . . .92

Table 509.4 Type of Venting System to be Used . . . . . . . . . . . . . . . . . . .92

509.5 Masonry, Metal, and Factory-Built Chimneys . . . . . . . . .93

509.6 Gas Vents . . . . . . . . . . . . . . . . . . . .94

Table 509.6.1 Roof Slope Heights . . . . . . . . . . . .95

509.7 Single-Wall Metal Pipe . . . . . . . . . .97

Table 509.7.3.4(1) Clearances for Connectors . . . . . . .97

Table 509.7.3.4(2) Reduction of Clearances with Specified Forms of Protection . . . .99

509.8 Through-the-Wall Vent Termination . . . . . . . . . . . . . . . . . .100

509.9 Condensation Drain . . . . . . . . . . .100

509.10 Vent Connectors for

Category I Appliances . . . . . . . . .100

Table 509.8.1 Through-the-Wall Direct-Vent Termination Clearances . . . . . . . .101

Table 509.10.1.3 Minimum Thickness for

Galvanized Steel Vent

Connectors for Low-Heat

Appliances . . . . . . . . . . . . . . . . . .102

Table 509.10.1.4 Minimum Thickness for Steel

Vent Connectors for

Medium-Heat Appliances . . . . . . .102

509.11 Vent Connectors for

Category II, Category III, and Category IV Appliances . . . . . . . .104

509.12 Appliances Requiring Draft Hoods . . . . . . . . . . . . . . . . . . . . . .104

509.13 Manually Operated Dampers . . . .104

509.14 Automatically Operated Vent Dampers . . . . . . . . . . . . . . . .104

509.15 Obstructions . . . . . . . . . . . . . . . . .104

510.0 Sizing of Category I Venting Systems . . . . . . . . . . . . . . . . . . . .104

510.1 Additional Requirements to Single Appliance Vent . . . . . . . . .104

510.2 Additional Requirements to Multiple-Appliance Vent . . . . . . . . .106

Table 510.2.1 Vent Connector Maximum

Length . . . . . . . . . . . . . . . . . . . . . .106

Table 510.1.2(1) Type B Double-Wall Gas Vent . . .110

Table 510.1.2(2) Type B Double-Wall Gas Vent . . .113

Table 510.1.2(3) Masonry Chimney . . . . . . . . . . . . .115

Table 510.1.2(4) Masonry Chimney . . . . . . . . . . . . .117

Table 510.1.2(5) Single-Wall Metal Pipe or Type B Asbestos-Cement Vent . . .119

Table 510.1.2(6) Exterior Masonry Chimney . . . . . .120

Table 510.2(1) Type B Double-Wall Vent . . . . . . .121

Table 510.2(2) Type B Double-Wall Vent . . . . . . .125

Table 510.2(3) Masonry Chimney . . . . . . . . . . . . .127

Table 510.2(4) Masonry Chimney . . . . . . . . . . . . .129

Table 510.2(5) Single-Wall Metal Pipe or Type B Asbestos-Cement Vent . .131

Table 510.2(6) Exterior Masonry Chimney . . . . . .131

Table 510.2(7) Exterior Masonry Chimney . . . . . .132

Table 510.2(8) Exterior Masonry Chimney . . . . . .133

Table 510.2(9) Exterior Masonry Chimney . . . . . .134

CHAPTER 6 WATER SUPPLY AND

DISTRIBUTION . . . . . . . . . . . . . .135

601.0 General . . . . . . . . . . . . . . . . . . . . .137

601.1 Applicability . . . . . . . . . . . . . . . . . .137

601.2 Water Supply and Flushing . . . . .137

601.3 Identification of a Potable and Nonpotable Water System . . . . . .137

Table 601.3.2 Minimum Length of Color Field and Size of Letters . . . . . . .138

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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
    Overview
    1. 301.7 One- and Two-Family Dwellings . .50
    2. 301.8 OSHPD 1R . . . . . . . . . . . . . . . . . . .50
    3. 310.14 Services/Systems and Utilities . . . .52
    4. 310.15 Telephone and Data
    5. 401.3 Water-Conserving Fixtures
    6. 422.8 Cosmetology . . . . . . . . . . . . . . . . .69
    7. 422.9 Cosmetology Establishments . . . . .69
    8. 422.10 Commissaries Serving Mobile
    9. 422.11 Employee Lavatories in
    10. 501.2 California Energy Code
    11. 601.4 Schools of Cosmetology and
    12. 601.5 Meat and Poultry Processing
    13. 601.6 Collection Centers and
    14. 601.7 Renderers . . . . . . . . . . . . . . . . . . .139
    15. 601.8 Horse Meat and Pet Food
    16. 615.1 Uses Not Permitted . . . . . . . . . . . . .162
    17. 616.0 Emergency Water Supply . . . . . . . .162
    18. 717.2 Meat and Poultry Processing
    19. 727.0 Emergency Sanitary Drainage . . .178
    20. 1010.2 Meat and Poultry Processing
    21. 1010.3 Collection Centers and
    22. 1010.4 Horse Meat and Pet Food
    23. 1010.5 Draining and Plumbing . . . . . . . .197
    24. 1211.8 Earthquake-Actuated Gas
    25. 1501.9 Signage . . . . . . . . . . . . . . . . . . . .310
    26. 1504.5 Irrigation, Disposal Field and
    27. 1504.6 Reserved . . . . . . . . . . . . . . . . . . .318
    28. 1504.7 Reserved . . . . . . . . . . . . . . . . . . .318
    29. 1505.15 Minimum Water Quality
    30. 1505.16 Maintenance and Inspection . . . .322
    31. 101.1 Title. This document shall be known as the “Uniform
    32. 101.2 Scope. The provisions of this code shall apply to the
    33. 101.3 Purpose. This code is an ordinance providing minimum req…
    34. 101.4 Unconstitutional. Where a section, subsection, sentence,…
    35. 101.5 Validity. Where a provision of this code, or the applica…
    36. 102.1 Conflicts Between Codes. Where the requirements
    37. 102.2 Existing Installations. Plumbing systems lawfully
    38. 102.3 Maintenance. The plumbing and drainage system,
    39. 102.4 Additions, Alterations, Renovations, or Repairs.
    40. 102.5 Health and Safety. Where compliance with the provisions …
    41. 102.6 Changes in Building Occupancy. Plumbing systems that are…
    42. 102.7 Moved Structures. Parts of the plumbing system of
    43. 102.8 Appendices. The provisions in the appendices are
    44. 103.1 General. The Authority Having Jurisdiction shall be
    45. 103.2 Liability. The Authority Having Jurisdiction charged
    46. 103.3 Applications and Permits. The Authority Having
    47. 103.4 Right of Entry. Where it is necessary to make an
    48. 104.1 Permits Required. It shall be unlawful for a person,
    49. 104.2 Exempt Work. A permit shall not be required for the
    50. 104.3 Application for Permit. To obtain a permit, the
    51. 104.4 Permit Issuance. The application, construction documents…
    52. 104.5 Fees. Fees shall be assessed in accordance with the
    53. 105.1 General. Plumbing systems for which a permit is
    54. 105.2 Required Inspections. New plumbing work and
    55. 105.3 Testing of Systems. Plumbing systems shall be
    56. 105.4 Connection to Service Utilities. No person shall
    57. 106.1 General. It shall be unlawful for a person, firm, or
    58. 106.2 Notices of Correction or Violation. Notices of
    59. 106.3 Penalties. A person, firm, or corporation violating a
    60. 106.4 Stop Orders. Where work is being done contrary to
    61. 106.5 Authority to Disconnect Utilities in Emergen-
    62. 106.6 Authority to Condemn. Where the Authority Having Jurisdi…
    63. 107.1 General. In order to hear and decide appeals of orders,
    64. 107.2 Limitations of Authority. The Board of Appeals
  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
  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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