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Chapter 10 — TRAPS AND INTERCEPTORS

1003.3 Size. The size (nominal diameter) of a trap for a

California Plumbing Code (Title 24, Part 5) · 2019 edition · updated 2026-09-10 · California

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

given fixture shall be sufficient to drain the fixture rapidly but in no case less than nor more than one pipe size larger than given in Table 702.1. The trap shall be the same size as the trap arm to which it is connected.

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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
  7. Chapter 7 — SANITARY DRAINAGE
  8. Chapter 8 — INDIRECT WASTES
  9. Chapter 9 — VENTS
  10. ▸Chapter 10 — TRAPS AND INTERCEPTORS
    Overview
    1. 1001.2 Where Required. Each plumbing fixture shall be
    2. 1002.2 Fixture Traps. Each fixture trap shall have a protectin…
    3. 1002.3 Change of Direction. A trap arm shall be permitted to c…
    4. 1002.4 Vent Pipe Opening. The vent pipe opening from
    5. 1003.0 Traps — Described.1003.1 General Requirements. Each tra…
    6. 1003.2 Slip Joint Fittings. A maximum of one approved
    7. 1003.3 Size. The size (nominal diameter) of a trap for a
    8. 1004.0 Traps.1004.1 Prohibited. No form of trap that depends f…
    9. 1004.2 Movable Parts. Bladders, check valves or another
    10. 1007.2 Trap Seal Primers. Potable water supply trap seal
    11. 1009.2 Approval. The size, type, and location of each intercep…
    12. 1009.3 Design. Interceptors (clarifiers) for sand and similar …
    13. 1009.4 Relief Vent. Interceptors (clarifiers) shall be so
    14. 1009.5 Location. Each interceptor (clarifier) cover shall be
    15. 1009.6 Maintenance of Interceptors. Interceptors shall
    16. 1009.7 Discharge. The waste pipe from oil and sand interceptor…
    17. 1010.2 [AGR] Meat and Poultry Processing Plants.
    18. 1010.3 [AGR] Collection Centers and Facilities. All
    19. 1010.4 [AGR] Horse Meat and Pet Food Establish-ments. There sh…
    20. 1010.5 [AGR] Draining and Plumbing. There shall be
    21. 1014.0 Grease Interceptors.1014.1 General. Where it is determi…
    22. 1014.2 Hydromechanical Grease Interceptors. Plumbing fixtures …
    23. 1014.3 Gravity Grease Interceptors. Required gravity
    24. 1015.2 Components, Materials, and Equipment. FOG
    25. 1015.3 Sizing and Installation. FOG disposal systems
    26. 1015.4 Performance. FOG disposal systems shall produce
    27. 1015.5 [OSHPD 1, 1R, 2, 3, 4 & 5] Grease interceptors
    28. 1015.6 [OSHPD 1, 1R, 2, 3, 4 & 5] Grease interceptors
    29. 1016.0 Sand Interceptors.1016.1 Discharge. Where the discharge…
    30. 1016.2 Authority Having Jurisdiction. Sand interceptors
    31. 1016.3 Construction and Size. Sand interceptors shall be
    32. 1016.4 Separate Use. Sand and similar interceptors for
    33. 1017.2 Design of Interceptors. Each manufactured interceptor t…
    34. 1017.0 Oil and Flammable Liquid Interceptors.1017.1 Intercepto…
  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 STANDARD FOR PEX TUBING SYSTEMS FOR …
  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

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