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Earlier editions: 20222019

Chapter 16 — NONPOTABLE RAINWATER CATCHMENT SYSTEMS

1603.1 Rainwater Catchment Systems. The design and

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.

ment or both, the collected rainwater shall be treated as

installation of nonpotable rainwater catchment systems shall

necessary to ensure the required water quality is deliv-

be in accordance with Section 1603.2 through Section 1603.20.

ered at the point of use. Where chlorine is used for dis-

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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
  16. ▸Chapter 16 — NONPOTABLE RAINWATER CATCHMENT SYSTEMS
    Overview
    1. 1601.1 Applicability. The provisions of this chapter shall
    2. 1601.2 System Design. Rainwater catchment systems shall
    3. 1601.3 Permit. It shall be unlawful for a person to construct,
    4. 1601.4 Component Identification. System components
    5. 1601.5 Maintenance and Inspection. Rainwater catchment systems…
    6. 1601.6 Operation and Maintenance Manual. An operation and main…
    7. 1601.7 Minimum Water Quality Requirements. The
    8. 1601.8 Material Compatibility. Rainwater catchment systems sha…
    9. 1601.9 System Controls. Controls for pumps, valves, and
    10. 1601.10 Separation Requirements. Underground rainwater catchme…
    11. 1601.11 Abandonment. Rainwater catchment systems that
    12. 1601.12 Sizing. Unless otherwise provided for in this chapter,…
    13. 1602.1 General. The installation, construction, alteration,
    14. 1602.2 Plumbing Plan Submission. No permit for a
    15. 1602.3 System Changes. No changes or connections shall
    16. 1602.4 Connections to Potable or Reclaimed (Recy-
    17. 1602.5 Initial Cross-Connection Test. Where a portion
    18. 1602.6 Sizing. The design and size of rainwater drains, gutter…
    19. 1602.7 Rainwater Catchment System Materials. Rain- 1603.3 Rain…
    20. 1602.8 Rainwater Catchment System Color and
    21. 1603.4 Minimum Water Quality. The minimum water
    22. 1602.9 Deactivation and Drainage for Cross-Connec- shall be in…
    23. 1603.1 Rainwater Catchment Systems. The design and
    24. 1603.2 Outside Hose Bibbs. Outside hose bibbs shall be infecti…
    25. 1603.5 Rainwater Storage Tanks. Rainwater storage tanks
    26. 1603.6 Location. Rainwater storage tanks shall be permitted to…
    27. 1603.7 Above Grade. Above grade, storage tanks shall be
    28. 1603.9 Drainage and Overflow. Rainwater storage tanks
    29. 1603.10 Opening and Access Protection. Rainwater
    30. 1603.11 Marking. Rainwater tanks shall be permanently
    31. 1603.12 Storage Tank Venting. Where venting using
    32. 1603.13 Pumps. Pumps serving rainwater catchment systems shall…
    33. 1605.1 General. Rainwater catchment systems shall be
    34. 1605.2 Supply System Inspection and Test. Rainwater
    35. 1605.3 Cross-Connection Inspection and Testing. An
    36. 1603.14 Roof Drains. Primary and secondary roof drains,
    37. 1603.15 Water Quality Devices and Equipment.
    38. 1603.16 Freeze Protection. Tanks and piping installed in
    39. 1603.17 Debris Removal. The rainwater catchment conveyance sys…
    40. 1603.18 Required Filters. A filter permitting the passage
    41. 1603.19 Roof Gutters. Gutters shall maintain a minimum
    42. 1603.20 Rainwater Diversion Valves. Rainwater diversion valves…
    43. 1604.1 General. Signs in buildings using rainwater shall be
    44. 1604.2 Commercial, Industrial, Institutional and Res-
    45. 1604.3 Equipment Room Signs. Each equipment room
  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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