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Chapter 10 — TRAPS AND INTERCEPTORS

1003.0 Traps — Described.1003.1 General Requirements. Each trap, except for

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.

traps within an interceptor or similar device shall be selfcleaning. Traps for bathtubs, showers, lavatories, sinks, laundry tubs, floor drains, urinals, drinking fountains, dental units, and similar fixtures shall be of standard design, weight and shall be of ABS, cast-brass, cast-iron, lead, PP, PVC, or other approved material. An exposed and readily accessible drawncopper alloy tubing trap, not less than 17 B & S Gauge (0.045 inch) (1.143 mm), shall be permitted to be used on fixtures discharging domestic sewage. Exception: ( 1) Drawn-copper alloy tubing traps shall not be used for uri nals. Each trap shall have the manufacturer’s name

( 1) Drawn-copper alloy tubing traps shall not be used for uri nals. Each trap shall have the manufacturer’s name stamped legibly in the metal of the trap, and each tubing trap shall have the gauge of the tubing in addition to the manufacturer’s name. A trap shall have a smooth and uniform interior waterway. (2) [HCD 1 & HCD 2] Non-water supplied urinals conform-

ing to ASME A112.19.19-2016, Standard for Vitreous China

TRAP ARM PIPE
DIAMETER (inches)		 DISTANCE TRAP TO
VENT MINIMUM
(inches)		 LENGTH MAXIMUM
(inches)
14
 12
12




Notes: 1 Maintain 1⁄4 inch per foot slope (20.8 mm/m). 2 The developed length between the trap of a water closet or similar fixture (measured from the top of the closet flange to the inner edge of the vent) and its vent shall not exceed 6 feet (1829 mm).

(2) [HCD 1 & HCD 2] Non-water supplied urinals conform-

ing to ASME A112.19.19-2016, Standard for Vitreous China Nonwater Urinals, or reference standards in Table 1701.1 for non-vitreous ceramic or plastic urinal fixtures.

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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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