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Chapter 15 — ALTERNATE WATER SOURCES FOR NONPOTABLE APPLICATIONS

1502.4 Separation Requirements. Underground alternate

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.

water source service piping other than gray water shall be separated from the building sewer in accordance with this code. Treated nonpotable water pipes shall be permitted to be run or laid in the same trench as potable water pipes with a 12 inch (305 mm) minimum vertical and horizontal separation where both pipe materials are approved for use within a building. Where horizontal piping materials do not comply with this requirement, the minimum separation shall be increased to 60 inches (1524 mm). The potable water piping shall be installed at an elevation above the treated nonpotable water piping. Exception: [DWR] Recycled water supply systems that are within or a part of a building shall comply with Section 1505.11.

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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. 1501.0 General.1501.1 Applicability [BSC-CG, DWR & HCD 1]. The
    2. 1501.2 System Design. Alternate water source systems
    3. 1501.3 Permit [BSC-CG, HCD 1, DWR]. It shall be unlawful for a…
    4. 1501.4 Component Identification. System components
    5. 1501.5 Maintenance and Inspection 1, DWR]. Alternate water sou…
    6. 1501.6 Operation and Maintenance Manual [BSC-
    7. 1501.7 Minimum Water Quality Requirements [BSC-
    8. 1501.8 Material Compatibility. Alternate water source systems …
    9. 1501.9 Signage [BSC-CG, HCD 1, HCD 2, HCD 1-AC, &DWR]. Signage…
    10. 1501.10 System Controls. Controls for pumps, valves, and
    11. 1501.11 Hose Bibbs for Single-Family Dwellings [HCD1]. Hose bi…
    12. 1502.2 Supply System Inspection and Test. Alternate
    13. 1502.3 Cross-Connection Inspection and Testing. An
    14. 1502.6 Sizing. Unless otherwise provided for in this chapter, …
    15. 1503.1 General. The provisions of this section shall apply
    16. 1502.4 Separation Requirements. Underground alternate
    17. 1502.5 Abandonment. Alternate water source systems that
    18. 1503.2 System Requirements. Gray water shall be permitted to b…
    19. 1503.3 Connections to Potable and Reclaimed(Recycled) Water Sy…
    20. 1503.4 Location. No gray water system or part thereof shall
    21. 1503.5 Plot Plan Submission. No permit for a gray water
    22. 1503.6 Prohibited Location. Where there is insufficient
    23. 1503.7 Drawings and Specifications. The Authority
    24. 1503.9 Gray Water System Components. Gray water
    25. 1504.2 Required Area of Subsurface Irrigation
    26. 1504.3 Determination of Maximum Absorption Capac-
    27. 1504.4 Groundwater Level. No excavation for an irrigation fiel…
    28. 1504.5 Irrigation, Disposal Field and Mulch Basin Con-structio…
    29. 1504.6 Reserved.
    30. 1504.7 Reserved.
    31. 1504.8 Gray Water System Color and Marking Infor-mation. Press…
    32. 1504.9 Other Collection and Distribution Systems. Other collec…
    33. 1504.10 Testing. Building drains and vents for gray water
    34. 1504.11 Maintenance. Gray water systems and components shall b…
    35. 1505.0 Recycled Water 1505.1 General. The provisions of Supply…
    36. 1505.3 System Changes. No changes or connections shall
    37. 1505.4 Connections to Potable or Reclaimed (Recy-cled) Water S…
    38. 1505.2 Permit. It shall be unlawful for a person to construct,
    39. 1505.5 Initial Cross-Connection Test. A cross-connection test …
    40. 1505.6 Recycled Water Recycled water supply system materials s…
    41. 1505.8 Valves. Valves, except fixture supply control valves,
    42. 1505.9 Hose Bibbs. Hose bibbs shall not be allowed on
    43. 1505.10 Required Appurtenances. The recycled water
    44. 1505.11 Pipe Separation in Trenches. Reclaimed (recycled) wate…
    45. 1505.12 Signage. Signs in rooms and water closet tanks in
    46. 1505.13 Inspection and Testing. Recycled water supply
    47. 1505.15 Maintenance and Inspection. Recycled water
    48. 1506.0 On-Site Treated Nonpotable Gray Water Sys-
    49. 1506.2 Plumbing Plan Submission. No permit for an
    50. 1506.3 System Changes. No changes or connections shall
    51. 1506.4 Connections to Potable or Reclaimed (Recy-
    52. 1506.5 Initial Cross-Connection Test. A cross-connection test …
    53. 1506.6 On-Site Treated Nonpotable tem Materials. On-site treat…
    54. 1506.7 On-Site Treated Nonpotable Devices and Systems. Devices…
    55. 1506.9 Design and Installation. The design and installation of…
    56. 1506.10 Valves. Valves, except fixture supply control
    57. 1506.11 Signs. Signs in buildings using on-site treated nonpot…
    58. 1506.12 Inspection and Testing. On-site treated nonpotable gra…
  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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