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Earlier editions: 20222019

Chapter 15 — ALTERNATE WATER SOURCES FOR NONPOTABLE APPLICATIONS

1506.10 Design and Installation.

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.

The design and installation of on-site treated nonpotable gray water systems shall be in accordance with Section 1506.10.1 through Section 1506.10.6 .

1506.10.1 Listing Terms and Installation Instruc- tions. On-site treated nonpotable gray water systems shall be installed in accordance with the terms of its listing and the manufacturer’s installation instructions. 1506.10.2 Minimum Water Quality. [BSC-CG & HCD 1] On-site treated nonpotable gray water supplied to toilets or urinals or for other uses in which it is sprayed or exposed shall be disinfected. Acceptable disinfection methods shall include chlorination, ultraviolet sterilization, ozone, or other methods as approved by the Authority Having Jurisdiction. The minimum water quality for on-site treated nonpotable gray water systems shall meet the applicable water quality requirements for the intended applications as determined by the public health Authority Having Jurisdiction. In the absence of local water quality requirements for on-site treated nonpotable gray water, the requirements of IAPMO IGC 324 or NSF/ANSI 350 shall apply.

324 2025 CALIFORNIA PLUMBING CODE

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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
  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
    Overview
    1. 1501.1 Applicability. [BSC-CG, DWR & HCD 1] The provisions of …
    2. 1501.2 System Design. [BSC-CG, HCD 1 & DWR]
    3. 1501.3 Permit. [BSC-CG, HCD 1 & DWR] It shall be
    4. 1501.4 Component Identification. System components
    5. 1501.5 Maintenance and Inspection. [BSC-CG, HCD
    6. 1505.16 .
    7. 1501.6 Operation and Maintenance Manual. [BSC-
    8. 1501.7 Minimum Water Quality Requirements. [BSC-
    9. 1501.8 Material Compatibility. Alternate water source systems …
    10. 1501.9 Signage. [BSC-CG, HCD 1, HCD 2 & HCD 1-
    11. 1501.10 System Controls. Controls for pumps, valves, and
    12. 1502.1 General. Alternate water source systems shall be
    13. 1502.2 Supply System Inspection and Test. Alternate
    14. 1502.3 Cross-Connection Inspection and Testing. An
    15. 1502.4 Separation Requirements. Underground alternate
    16. 1502.5 Abandonment. Alternate water source systems that
    17. 1502.6 Sizing. Unless otherwise provided for in this chapter, …
    18. 1503.1 General. The provisions of this section shall apply to
    19. 1503.2 System Requirements. Gray water shall be permitted to b…
    20. 1503.3 Connections to Potable and Reclaimed (Recy-
    21. 1503.4 Location. No gray water system or part thereof shall
    22. 1503.5 Plot Plan Submission. No permit for a gray water
    23. 1503.6 Prohibited Location. Where there is insufficient
    24. 1503.7 Drawings and Specifications. The Authority Having Juris…
    25. 1503.8 Procedure for Estimating Gray Water Dis-
    26. 1503.9 Gray Water System Components. Gray water
    27. 1504.1 General. Irrigation or disposal fields shall be permitt…
    28. 1504.2 Required Area of Subsurface Irrigation
    29. 1504.3 Determination of Maximum Absorption
    30. 1504.4 Groundwater Level. No excavation for an irrigation fiel…
    31. 1504.5 Irrigation, Disposal Field and Mulch Basin
    32. 1504.6 Reserved.
    33. 1504.7 Reserved .
    34. 1504.8 Gray Water System Color and Marking Infor-
    35. 1504.9 Other Collection and Distribution Systems.
    36. 1504.10 Testing. Building drains and vents for gray water
    37. 1504.11 Maintenance. Gray water systems and components shall b…
    38. 1505.1 General. The provisions of Section 1505.0 through
    39. 1505.2 Permit. It shall be unlawful for a person to construct,
    40. 1505.3 System Changes. No changes or connections shall
    41. 1505.4 Connections to Potable or Recycled Water
    42. 1505.5 Water Pressure. Reclaimed (recycled) water systems supp…
    43. 1505.6 Initial Cross-Connection Test. A cross-connection
    44. 1505.7 Recycled Water Supply System Materials.
    45. 1505.8 Recycled Water Supply System Color and
    46. 1505.9 Valves. Valves, except fixture supply control valves,
    47. 1505.13 Signage . Signs in rooms and water closet tanks in
    48. 1505.14 Inspection and Testing. Recycled water supply
    49. 1505.10 Hose Bibbs. Hose bibbs shall not be allowed on
    50. 1505.11 Required Appurtenances. The recycled water
    51. 1505.12 Pipe Separation in Trenches . Reclaimed (recycled) wat…
    52. 1505.15 Minimum Water Quality Requirements for
    53. 1505.16 Maintenance and Inspection. Recycled water
    54. 1506.1 General. The provisions of this section shall apply
    55. 1506.2 Plumbing Plan Submission. No permit for an
    56. 1506.3 System Changes. No changes or connections shall
    57. 1506.4 Connections to Potable or Recycled Water
    58. 1506.5 Water Pressure. On-site treated non-potable gray
    59. 1506.11 Valves. Valves, except fixture supply control
    60. 1506.12 Signs. Signs in buildings using on-site treated nonpot…
    61. 1506.13 Inspection and Testing. On-site treated nonpotable gra…
    62. 1506.6 Initial Cross-Connection Test. A cross-connection test …
    63. 1506.7 On-Site Treated Nonpotable Gray Water Sys-
    64. 1506.8 On-Site Treated Nonpotable Gray Water
    65. 1506.9 On-Site Treated Nonpotable Gray Water Sys-
    66. 1506.10 Design and Installation. The design and installation o…
  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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