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Chapter 3 — GENERAL REGULATIONS

314.3 Open Trenches. Excavations required to be made

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.

for the installation of a building drainage system or part thereof, within the walls of a building, shall be open trench work and shall be kept open until the piping has been inspected, tested, and accepted.

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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
    Overview
    1. 301.2 Minimum Standards. Pipe, pipe fittings, traps, fixtures,…
    2. 301.3 Alternate Materials and Methods of Construc-
    3. 301.4 Flood Hazard Areas. Plumbing systems shall be
    4. 301.5 Alternative Engineered Design. An alternative
    5. 301.6 One- and Two-Family Dwellings. [HCD 1] The
    6. 303.0 Disposal of Liquid Waste.303.1 General. It shall be unla…
    7. 304.0 Connections to Plumbing System Required.304.1 General. P…
    8. 305.0 Damage to Drainage System or Public Sewer.305.1 Unlawful…
    9. 306.2 Safe Discharge. Sewage or other waste from a
    10. 307.2 Ownership. No subdivision, sale, or transfer of ownershi…
    11. 309.2 Concealing Imperfections. It is unlawful to conceal crac…
    12. 309.3 Burred Ends. Burred ends of pipe and tubing shall
    13. 309.4 Installation Practices. Plumbing systems shall be
    14. 309.5 Sound Transmission. Plumbing piping systems
    15. 310.2 Drainage and Vent Piping. No drainage or vent
    16. 310.3 Waste Connection. No waste connection shall be
    17. 310.4 Use of Vent and Waste Pipes. Except as hereinafter provi…
    18. 310.5 Obstruction of Flow. No fitting, fixture and piping
    19. 310.6 Dissimilar Metals. Except for necessary valves,
    20. 310.7 Direction of Flow. Valves, pipes, and fittings shall be
    21. 310.8 Screwed Fittings. Screwed fittings shall be ABS,
    22. 310.9 [OSHPD 1, 1R, 2, 3, 4 & 5] Drainage piping over
    23. 310.10 [OSHPD 1, 1R, 3, 4 & 5] Floor drains, waste traps
    24. 310.11 [SFM] For applications listed in Section 1.11.0 reg-
    25. 310.12 [OSHPD 1, 1R, 2, 4 & 5] Services/Systems andUtilities. …
    26. 310.13 Telephone and Data Equipment Rooms[OSHPD 1, 1R, 4 & 5].…
    27. 311.0 Independent Systems.311.1 General. The drainage system o…
    28. 312.2 Installation. Piping in connection with a plumbing
    29. 312.3 Building Sewer and Drainage Piping. No building sewer or…
    30. 312.4 Corrosion, Erosion, and Mechanical Damage. Piping subjec…
    31. 312.5 Protectively Coated Pipe. Protectively coated pipe
    32. 312.6 Freezing Protection. No water, soil, or waste pipe
    33. 312.7 Fire-Resistant Construction. Piping penetrations
    34. 312.8 Waterproofing of Openings. Joints at the roof
    35. 312.9 Steel Nail Plates. Plastic and copper or copper alloy
    36. 312.10 Sleeves. Sleeves shall be provided to protect piping th…
    37. 312.11 Structural Members. A structural member weakened or imp…
    38. 312.12 Rodentproofing. Strainer plates on drain inlets
    39. 313.2 Material. Hangers and anchors shall be of sufficient
    40. 313.3 Suspended Piping. Suspended piping shall be supported at…
    41. 313.4 Alignment. Piping shall be supported in such a manner as…
    42. 313.5 Underground Installation. Piping in the ground
    43. 313.6 Hanger Rod Sizes. Hanger rod sizes shall be not
    44. 314.2 Tunneling and Driving. Tunneling and driving shall
    45. 314.3 Open Trenches. Excavations required to be made
    46. 314.4 Excavations. Excavations shall be completely backfilled …
    47. 313.7 Gas Piping. Gas piping shall be supported by metal
    48. 313.8 [OSHPD 1, 1R, 2, 3, 4 & 5] Refer to Title 24, Part 2
    49. 315.2 Prohibited Joints and Connections. A fitting or
    50. 317.0 Food-Handling Establishments.317.1 General. Food or drin…
    51. 318.2 Pressure Tests (10 psi or less). Required pressure tests…
    52. 318.3 Pressure Tests (greater than 10 psi to 100 psi).
    53. 318.4 Pressure Tests (exceeding 100 psi). Required
    54. 318.5 Pressure Range. Test gauges shall have a pressure
    55. 321.0 Essential Plumbing Provisions. [OSHPD 1, 1R,2, 3 (surgic…
  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 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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