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Chapter 16 — NONPOTABLE RAINWATER CATCHMENT SYSTEMS

1603.2 Construction. Rainwater storage tanks shall be

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.

constructed of solid, durable materials not subject to excessive corrosion or decay and shall be watertight.

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APPLICATION MINIMUM TREATMENT MINIMUM WATER QUALITY
Car washing
 Debris excluder or other approved means in compliance
_with Section_1603.14

 N/A
Car washing
100 Micron (100 µm) in compliance with Section
1603.15_ for drip irrigation_
100 Micron (100 µm) in compliance with Section
1603.15_ for drip irrigation_
Surface, subsurface and drip irrigation
Debris excluder or other approved means in compliance
_with Section_1603.14

 N/A
Surface, subsurface and drip irrigation
100 Micron (100 µm) in compliance with Section
1603.15_ for drip irrigation_
100 Micron (100 µm) in compliance with Section
1603.15_ for drip irrigation_
Spray irrigation where the maximum
storage volume is less than 360 gallons
(1363 L)
Debris excluder or other approved means in compliance
_with Section_1603.14

 N/A

Spray irrigation where the maximum
storage volume is equal to or greater
than 360 gallons (1363 L)

 Debris excluder or other approved means in compliance
_with Section_1603.14

 Escherichia coli: < 100 CFU/100 ml
Turbidity: < 10 NTU

Urinal and water closet flushing, clothes
washing, and trap priming

 Debris excluder or other approved means in compliance
_with Section_1603.14

 Escherichia coli: < 100 CFU/100 ml

Urinal and water closet flushing, clothes
washing, and trap priming
100 Micron (100 µm) in compliance with Section
1603.15

 Turbidity: < 10 NTU
Ornamental fountains and other water
features
 Debris excluder or other approved means in compliance
_with Section_1603.14

 Escherichia coli: < 100 CFU/100 ml
Turbidity: < 10 NTU
Cooling tower make up water
Debris excluder or other approved means in compliance
_with Section_1603.14
Escherichia coli: < 100 CFU/100 ml
Cooling tower make up water
100 Micron (100 µm) in compliance with Section
1603.15		 Turbidity: < 10 NTU

2019 CALIFORNIA PLUMBING CODE 329

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1603.6.1 Overflow Outlet Size. The overflow outlet shall be sized to accommodate the flow of the rainwater entering the tank and not less than the aggregate crosssectional area of inflow pipes.

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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. 1601.2 System Design. Rainwater catchment systems shall
    2. 1601.3 Permit. It shall be unlawful for a person to construct,
    3. 1601.4 Component Identification. System components
    4. 1601.5 Maintenance and Inspection. Rainwater catchment systems…
    5. 1601.6 Operation and Maintenance Manual. An operation and main…
    6. 1601.7 Minimum Water Quality Requirements. The
    7. 1602.2 Plumbing Plan Submission. No permit for a
    8. 1602.3 System Changes. No changes or connections shall
    9. 1602.4 Connections to Potable or Reclaimed (Recy-
    10. 1602.5 Initial Cross-Connection Test. Where a portion
    11. 1602.6 Sizing. The design and size of rainwater drains, gutter…
    12. 1602.7 Rainwater Catchment System Materials. Rainwater catchme…
    13. 1602.8 Rainwater Catchment System Color and Mark-
    14. 1602.9 Design and Installation. The design and installation of…
    15. 1603.2 Construction. Rainwater storage tanks shall be
    16. 1603.7 Opening and Access Protection. Rainwater
    17. 1603.3 Location. Rainwater storage tanks shall be permitted to…
    18. 1603.4 Above Grade. Above grade, storage tanks shall be
    19. 1603.5 Below Grade. Rainwater storage tanks installed
    20. 1603.6 Drainage and Overflow. Rainwater storage tanks
    21. 1603.8 Marking. Rainwater tanks shall be permanently
    22. 1603.9 Storage Tank Venting. Where venting using
    23. 1603.10 Pumps. Pumps serving rainwater catchment systems shall…
    24. 1603.11 Roof Drains. Primary and secondary roof drains,
    25. 1603.12 Water Quality Devices and Equipment. Devices and equip…
    26. 1603.13 Freeze Protection. Tanks and piping installed in
    27. 1603.14 Debris Removal. The rainwater catchment conveyance sys…
    28. 1603.15 Required Filters. A filter permitting the passage
    29. 1603.16 Roof Gutters. Gutters shall maintain a minimum
    30. 1604.0 Signs.1604.1 General. Signs in buildings using rainwate…
    31. 1604.2 Commercial, Industrial, Institutional idential Restroom…
    32. 1604.3 Equipment Room Signs. Each equipment room
    33. 1605.2 Supply System Inspection and Test. Rainwater
    34. 1605.3 Cross-Connection Inspection and Testing. An
  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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