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Earlier editions: 20222019

Chapter 10 — TRAPS AND INTERCEPTORS

1014.1 General. Where it is determined by the Authority

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.

Having Jurisdiction that waste pretreatment is required, an approved type of grease interceptor(s) shall comply with ASME A112.14.3, ASME A112.14.4, CSA B481, ANSI/CAN/IAPMO Z1001, PDI G-101, or PDI G-102, and sized in accordance with Section 1014.2.1 or Section

1014.3.6, shall be installed in accordance with the manufacturer’s installation instructions to receive the drainage from fixtures or equipment that produce grease-laden waste. Grease-laden waste fixtures shall include, but not be limited to, sinks and drains, such as floor drains, floor sinks, and other fixtures or equipment in serving establishments, such as restaurants, cafes, lunch counters, cafeterias, bars and clubs, hotels, hospitals, sanitariums, factory or school kitchens, or other establishments where grease is introduced into the drainage or sewage system in quantities that can effect line stoppage or hinder sewage treatment or private sewage disposal systems. A combination of hydromechanical, gravity grease interceptors and engineered systems shall be allowed to meet this code and other applicable requirements of the Authority Having Jurisdiction where space or existing physical constraints of existing buildings necessitate such installations. A grease interceptor shall not be required for individual dwelling units or private living quarters. Water closets, urinals, and other plumbing fixtures conveying human waste shall not drain into or through the grease interceptor.

1014.1A [OSHPD 1, 1R, 2, 3, 4 & 5] The Authority Having Jurisdiction is the individual official, board, department or agency authorized to administer and enforce the sewage treatment system in the area of the location of the health facil- ity.

1014.1B [OSHPD 1, 1R, 2, 3, 4 & 5] Grease interceptors shall not be installed in food preparation area of the kitchens.

1014.1C [OSHPD 1, 1R, 2, 3, 4 & 5] Grease interceptors shall be installed outside of the kitchen area in location affording ease of maintenance and servicing.

TRAPS AND INTERCEPTORS

1014.1.1 Trapped and Vented. Each fixture discharging into a grease interceptor shall be individually trapped and vented in an approved manner.

1014.1.2 Maintenance. Grease interceptors shall be maintained in efficient operating condition by periodic removal of the accumulated grease and latent material. No such collected grease shall be introduced into drainage piping or a public or private sewer. Where the Authority Having Jurisdiction determines that a grease interceptor is not being properly cleaned or maintained, the Authority Having Jurisdiction shall have the authority to mandate the installation of additional equipment or devices and to mandate a maintenance program.

1014.1.3 Food Waste Disposers and Dishwash- ers. No food waste disposer or dishwasher shall be connected to or discharge into a grease interceptor. Commercial food waste disposers shall be permitted to discharge directly into the building’s drainage system.

Exception: Food waste disposers shall be permitted to discharge to grease interceptors that are designed to receive the discharge of food waste.

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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. 1001.1 Applicability. This chapter shall govern the materials,…
    2. 1001.2 Where Required. Each plumbing fixture shall be separate…
    3. 1002.1 Vent Pipes. Each plumbing fixture trap, except as
    4. 1002.2 Fixture Traps. Each fixture trap shall have a protectin…
    5. 1002.3 Change of Direction. A trap arm shall be permitted to c…
    6. 1002.4 Vent Pipe Opening. The vent pipe opening from
    7. 1003.1 General Requirements. Each trap, except for
    8. 1003.2 Slip Joint Fittings. A maximum of one approved
    9. 1003.3 Size. The size (nominal diameter) of a trap for a
    10. 1004.1 Prohibited. No form of trap that depends for its seal
    11. 1004.2 Movable Parts. Bladders, check valves or another
    12. 1005.1 General. Each fixture trap shall have a liquid seal of
    13. 1006.1 General. Floor drains shall connect into a trap so
    14. 1007.1 General. Floor drain or similar traps directly connecte…
    15. 1007.2 Trap Seal Primers. Potable water supply trap seal
    16. 1008.1 General. Building traps shall not be installed except
    17. 1009.1 Where Required. Interceptors (clarifiers) (including gr…
    18. 1009.2 Approval. The size, type, and location of each intercep…
    19. 1009.3 Design. Interceptors (clarifiers) for sand and similar …
    20. 1009.4 Relief Vent. Interceptors (clarifiers) shall be so
    21. 1009.5 Location. Each interceptor (clarifier) cover shall be
    22. 1009.6 Maintenance of Interceptors. Interceptors shall
    23. 1009.7 Discharge. The waste pipe from oil and sand interceptor…
    24. 1010.1 General. A fish, fowl, and animal slaughterhouse or
    25. 1010.2 Meat and Poultry Processing Plants. [AGR]
    26. 1010.3 Collection Centers and Facilities. [AGR] All
    27. 1010.4 Horse Meat and Pet Food Establishments.
    28. 1010.5 Draining and Plumbing. [AGR] There shall be
    29. 1011.1 General. A private or public wash rack or floor or
    30. 1012.1 General. Laundry equipment in commercial and
    31. 1013.1 General. Bottling plants shall discharge their process
    32. 1014.1 General. Where it is determined by the Authority
    33. 1014.2 Hydromechanical Grease Interceptors. Plumbing fixtures …
    34. 1014.3 Gravity Grease Interceptors. Required gravity
    35. 1015.1 Purpose. The purpose of this section is to provide
    36. 1015.2 Components, Materials, and Equipment. FOG
    37. 1015.3 Sizing and Installation. FOG disposal systems
    38. 1015.4 Performance. FOG disposal systems shall produce
    39. 1015.5 [OSHPD 1, 1R, 2, 3, 4 & 5] Grease interceptors
    40. 1015.6 [OSHPD 1, 1R, 2, 3, 4 & 5] Grease interceptors
    41. 1016.1 Discharge. Where the discharge of a fixture or drain
    42. 1016.2 Authority Having Jurisdiction. Sand interceptors
    43. 1016.3 Construction and Size. Sand interceptors shall be
    44. 1016.4 Separate Use. Sand and similar interceptors for
    45. 1017.1 Interceptors Required. Repair garages and gasoline stat…
    46. 1017.2 Interceptor Design Alternatives. Oil interceptors
    47. 1017.3 Interceptor Details. Oil and flammable liquid intercept…
    48. 1017.4 Design of Interceptors. Each manufactured interceptor t…
  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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