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Chapter 16 — NONPOTABLE RAINWATER CATCHMENT SYSTEMS

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.

(Matrix Adoption Tables are non-regulatory, intended only as an aid to the code user. See Chapter 1 for state agency authority and building applications.)

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Chapter/Section
1601.1
1601.2
1601.3 & Exceptions 1 & 2
1601.5
1601.6
1601.7
1602.4
1602.7 (Ref. 1602.7.3)
1602.9.3
1602.9.4
1602.9.6
1602.9.6.1
Table 1602.9.6
1603.4
1603.5
1603.6
1603.7 A, B
1603.9
1603.15
1604.1 - 1604.3
1605.3
1605.3.2
1605.3.3
1605.3.4		 BSC BSC-
CG		 SFM HCD DSA OSHPD BSCC DPH AGR DWR CEC CA SL SLC

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Chapter/Section
1601.1
1601.2
1601.3 & Exceptions 1 & 2
1601.5
1601.6
1601.7
1602.4
1602.7~~~~(Ref. 1602.7.3)
1602.9.3
1602.9.4
1602.9.6
1602.9.6.1
Table 1602.9.6
1603.4
1603.5
1603.6
1603.7~~~~A, B
1603.9
1603.15
1604.1 - 1604.3
1605.3
1605.3.2
1605.3.3
1605.3.4		 **BSC ** BSC-
CG		 SFM 1 2 1-AC **AC ** SS SS/CC 1 1R 2 3 4 5 5 5 5 5 5 5 5 5

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Chapter/Section
1601.1
1601.2
1601.3 & Exceptions 1 & 2
1601.5
1601.6
1601.7
1602.4
1602.7~~~~(Ref. 1602.7.3)
1602.9.3
1602.9.4
1602.9.6
1602.9.6.1
Table 1602.9.6
1603.4
1603.5
1603.6
1603.7~~~~A, B
1603.9
1603.15
1604.1 - 1604.3
1605.3
1605.3.2
1605.3.3
1605.3.4

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Chapter/Section
1601.1
1601.2
1601.3 & Exceptions 1 & 2
1601.5
1601.6
1601.7
1602.4
1602.7~~~~(Ref. 1602.7.3)
1602.9.3
1602.9.4
1602.9.6
1602.9.6.1
Table 1602.9.6
1603.4
1603.5
1603.6
1603.7~~~~A, B
1603.9
1603.15
1604.1 - 1604.3
1605.3
1605.3.2
1605.3.3
1605.3.4		 X **X ** X

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Chapter/Section
1601.1
1601.2
1601.3 & Exceptions 1 & 2
1601.5
1601.6
1601.7
1602.4
1602.7~~~~(Ref. 1602.7.3)
1602.9.3
1602.9.4
1602.9.6
1602.9.6.1
Table 1602.9.6
1603.4
1603.5
1603.6
1603.7~~~~A, B
1603.9
1603.15
1604.1 - 1604.3
1605.3
1605.3.2
1605.3.3
1605.3.4

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Chapter/Section
1601.1
1601.2
1601.3 & Exceptions 1 & 2
1601.5
1601.6
1601.7
1602.4
1602.7~~~~(Ref. 1602.7.3)
1602.9.3
1602.9.4
1602.9.6
1602.9.6.1
Table 1602.9.6
1603.4
1603.5
1603.6
1603.7~~~~A, B
1603.9
1603.15
1604.1 - 1604.3
1605.3
1605.3.2
1605.3.3
1605.3.4

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Chapter/Section
1601.1
1601.2
1601.3 & Exceptions 1 & 2
1601.5
1601.6
1601.7
1602.4
1602.7~~~~(Ref. 1602.7.3)
1602.9.3
1602.9.4
1602.9.6
1602.9.6.1
Table 1602.9.6
1603.4
1603.5
1603.6
1603.7~~~~A, B
1603.9
1603.15
1604.1 - 1604.3
1605.3
1605.3.2
1605.3.3
1605.3.4		 X

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1601.1
1601.2
1601.3 & Exceptions 1 & 2
1601.5
1601.6
1601.7
1602.4
1602.7~~~~(Ref. 1602.7.3)
1602.9.3
1602.9.4
1602.9.6
1602.9.6.1
Table 1602.9.6
1603.4
1603.5
1603.6
1603.7~~~~A, B
1603.9
1603.15
1604.1 - 1604.3
1605.3
1605.3.2
1605.3.3
1605.3.4		 X
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1601.1
1601.2
1601.3 & Exceptions 1 & 2
1601.5
1601.6
1601.7
1602.4
1602.7 (Ref. 1602.7.3)
1602.9.3
1602.9.4
1602.9.6
1602.9.6.1
Table 1602.9.6
1603.4
1603.5
1603.6
1603.7 A, B
1603.9
1603.15
1604.1 - 1604.3
1605.3
1605.3.2
1605.3.3
1605.3.4		 BSC BSC-
CG		 SFM HCD DSA OSHPD BSCC DPH AGR DWR CEC CA SL SLC

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Chapter/Section
1601.1
1601.2
1601.3 & Exceptions 1 & 2
1601.5
1601.6
1601.7
1602.4
1602.7~~~~(Ref. 1602.7.3)
1602.9.3
1602.9.4
1602.9.6
1602.9.6.1
Table 1602.9.6
1603.4
1603.5
1603.6
1603.7~~~~A, B
1603.9
1603.15
1604.1 - 1604.3
1605.3
1605.3.2
1605.3.3
1605.3.4		 X **X **
 X

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Chapter/Section
1601.1
1601.2
1601.3 & Exceptions 1 & 2
1601.5
1601.6
1601.7
1602.4
1602.7~~~~(Ref. 1602.7.3)
1602.9.3
1602.9.4
1602.9.6
1602.9.6.1
Table 1602.9.6
1603.4
1603.5
1603.6
1603.7~~~~A, B
1603.9
1603.15
1604.1 - 1604.3
1605.3
1605.3.2
1605.3.3
1605.3.4
**X **
X

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1601.1
1601.2
1601.3 & Exceptions 1 & 2
1601.5
1601.6
1601.7
1602.4
1602.7~~~~(Ref. 1602.7.3)
1602.9.3
1602.9.4
1602.9.6
1602.9.6.1
Table 1602.9.6
1603.4
1603.5
1603.6
1603.7~~~~A, B
1603.9
1603.15
1604.1 - 1604.3
1605.3
1605.3.2
1605.3.3
1605.3.4		 X
X

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1601.1
1601.2
1601.3 & Exceptions 1 & 2
1601.5
1601.6
1601.7
1602.4
1602.7~~~~(Ref. 1602.7.3)
1602.9.3
1602.9.4
1602.9.6
1602.9.6.1
Table 1602.9.6
1603.4
1603.5
1603.6
1603.7~~~~A, B
1603.9
1603.15
1604.1 - 1604.3
1605.3
1605.3.2
1605.3.3
1605.3.4		 X
 X

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1601.1
1601.2
1601.3 & Exceptions 1 & 2
1601.5
1601.6
1601.7
1602.4
1602.7~~~~(Ref. 1602.7.3)
1602.9.3
1602.9.4
1602.9.6
1602.9.6.1
Table 1602.9.6
1603.4
1603.5
1603.6
1603.7~~~~A, B
1603.9
1603.15
1604.1 - 1604.3
1605.3
1605.3.2
1605.3.3
1605.3.4		 X
 X

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1601.1
1601.2
1601.3 & Exceptions 1 & 2
1601.5
1601.6
1601.7
1602.4
1602.7~~~~(Ref. 1602.7.3)
1602.9.3
1602.9.4
1602.9.6
1602.9.6.1
Table 1602.9.6
1603.4
1603.5
1603.6
1603.7~~~~A, B
1603.9
1603.15
1604.1 - 1604.3
1605.3
1605.3.2
1605.3.3
1605.3.4		 X

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1601.1
1601.2
1601.3 & Exceptions 1 & 2
1601.5
1601.6
1601.7
1602.4
1602.7~~~~(Ref. 1602.7.3)
1602.9.3
1602.9.4
1602.9.6
1602.9.6.1
Table 1602.9.6
1603.4
1603.5
1603.6
1603.7~~~~A, B
1603.9
1603.15
1604.1 - 1604.3
1605.3
1605.3.2
1605.3.3
1605.3.4		 X
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1601.1
1601.2
1601.3 & Exceptions 1 & 2
1601.5
1601.6
1601.7
1602.4
1602.7 (Ref. 1602.7.3)
1602.9.3
1602.9.4
1602.9.6
1602.9.6.1
Table 1602.9.6
1603.4
1603.5
1603.6
1603.7 A, B
1603.9
1603.15
1604.1 - 1604.3
1605.3
1605.3.2
1605.3.3
1605.3.4		 BSC BSC-
CG		 SFM HCD DSA OSHPD BSCC DPH AGR DWR CEC CA SL SLC

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1601.1
1601.2
1601.3 & Exceptions 1 & 2
1601.5
1601.6
1601.7
1602.4
1602.7~~~~(Ref. 1602.7.3)
1602.9.3
1602.9.4
1602.9.6
1602.9.6.1
Table 1602.9.6
1603.4
1603.5
1603.6
1603.7~~~~A, B
1603.9
1603.15
1604.1 - 1604.3
1605.3
1605.3.2
1605.3.3
1605.3.4		 X
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1601.1
1601.2
1601.3 & Exceptions 1 & 2
1601.5
1601.6
1601.7
1602.4
1602.7~~~~(Ref. 1602.7.3)
1602.9.3
1602.9.4
1602.9.6
1602.9.6.1
Table 1602.9.6
1603.4
1603.5
1603.6
1603.7~~~~A, B
1603.9
1603.15
1604.1 - 1604.3
1605.3
1605.3.2
1605.3.3
1605.3.4		 X

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1601.1
1601.2
1601.3 & Exceptions 1 & 2
1601.5
1601.6
1601.7
1602.4
1602.7~~~~(Ref. 1602.7.3)
1602.9.3
1602.9.4
1602.9.6
1602.9.6.1
Table 1602.9.6
1603.4
1603.5
1603.6
1603.7~~~~A, B
1603.9
1603.15
1604.1 - 1604.3
1605.3
1605.3.2
1605.3.3
1605.3.4		 X
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1601.1
1601.2
1601.3 & Exceptions 1 & 2
1601.5
1601.6
1601.7
1602.4
1602.7~~~~(Ref. 1602.7.3)
1602.9.3
1602.9.4
1602.9.6
1602.9.6.1
Table 1602.9.6
1603.4
1603.5
1603.6
1603.7~~~~A, B
1603.9
1603.15
1604.1 - 1604.3
1605.3
1605.3.2
1605.3.3
1605.3.4		 X
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1601.1
1601.2
1601.3 & Exceptions 1 & 2
1601.5
1601.6
1601.7
1602.4
1602.7~~~~(Ref. 1602.7.3)
1602.9.3
1602.9.4
1602.9.6
1602.9.6.1
Table 1602.9.6
1603.4
1603.5
1603.6
1603.7~~~~A, B
1603.9
1603.15
1604.1 - 1604.3
1605.3
1605.3.2
1605.3.3
1605.3.4		 X
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1601.1
1601.2
1601.3 & Exceptions 1 & 2
1601.5
1601.6
1601.7
1602.4
1602.7~~~~(Ref. 1602.7.3)
1602.9.3
1602.9.4
1602.9.6
1602.9.6.1
Table 1602.9.6
1603.4
1603.5
1603.6
1603.7~~~~A, B
1603.9
1603.15
1604.1 - 1604.3
1605.3
1605.3.2
1605.3.3
1605.3.4		 X
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1601.1
1601.2
1601.3 & Exceptions 1 & 2
1601.5
1601.6
1601.7
1602.4
1602.7~~~~(Ref. 1602.7.3)
1602.9.3
1602.9.4
1602.9.6
1602.9.6.1
Table 1602.9.6
1603.4
1603.5
1603.6
1603.7~~~~A, B
1603.9
1603.15
1604.1 - 1604.3
1605.3
1605.3.2
1605.3.3
1605.3.4		 X
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1601.1
1601.2
1601.3 & Exceptions 1 & 2
1601.5
1601.6
1601.7
1602.4
1602.7 (Ref. 1602.7.3)
1602.9.3
1602.9.4
1602.9.6
1602.9.6.1
Table 1602.9.6
1603.4
1603.5
1603.6
1603.7 A, B
1603.9
1603.15
1604.1 - 1604.3
1605.3
1605.3.2
1605.3.3
1605.3.4		 BSC BSC-
CG		 SFM HCD DSA OSHPD BSCC DPH AGR DWR CEC CA SL SLC

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1601.1
1601.2
1601.3 & Exceptions 1 & 2
1601.5
1601.6
1601.7
1602.4
1602.7~~~~(Ref. 1602.7.3)
1602.9.3
1602.9.4
1602.9.6
1602.9.6.1
Table 1602.9.6
1603.4
1603.5
1603.6
1603.7~~~~A, B
1603.9
1603.15
1604.1 - 1604.3
1605.3
1605.3.2
1605.3.3
1605.3.4		 X
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1601.1
1601.2
1601.3 & Exceptions 1 & 2
1601.5
1601.6
1601.7
1602.4
1602.7~~~~(Ref. 1602.7.3)
1602.9.3
1602.9.4
1602.9.6
1602.9.6.1
Table 1602.9.6
1603.4
1603.5
1603.6
1603.7~~~~A, B
1603.9
1603.15
1604.1 - 1604.3
1605.3
1605.3.2
1605.3.3
1605.3.4		 X X

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1601.1
1601.2
1601.3 & Exceptions 1 & 2
1601.5
1601.6
1601.7
1602.4
1602.7~~~~(Ref. 1602.7.3)
1602.9.3
1602.9.4
1602.9.6
1602.9.6.1
Table 1602.9.6
1603.4
1603.5
1603.6
1603.7~~~~A, B
1603.9
1603.15
1604.1 - 1604.3
1605.3
1605.3.2
1605.3.3
1605.3.4		 X

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1601.1
1601.2
1601.3 & Exceptions 1 & 2
1601.5
1601.6
1601.7
1602.4
1602.7~~~~(Ref. 1602.7.3)
1602.9.3
1602.9.4
1602.9.6
1602.9.6.1
Table 1602.9.6
1603.4
1603.5
1603.6
1603.7~~~~A, B
1603.9
1603.15
1604.1 - 1604.3
1605.3
1605.3.2
1605.3.3
1605.3.4		 X
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1601.1
1601.2
1601.3 & Exceptions 1 & 2
1601.5
1601.6
1601.7
1602.4
1602.7~~~~(Ref. 1602.7.3)
1602.9.3
1602.9.4
1602.9.6
1602.9.6.1
Table 1602.9.6
1603.4
1603.5
1603.6
1603.7~~~~A, B
1603.9
1603.15
1604.1 - 1604.3
1605.3
1605.3.2
1605.3.3
1605.3.4		 X
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1601.2
1601.3 & Exceptions 1 & 2
1601.5
1601.6
1601.7
1602.4
1602.7~~~~(Ref. 1602.7.3)
1602.9.3
1602.9.4
1602.9.6
1602.9.6.1
Table 1602.9.6
1603.4
1603.5
1603.6
1603.7~~~~A, B
1603.9
1603.15
1604.1 - 1604.3
1605.3
1605.3.2
1605.3.3
1605.3.4		 X
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1601.2
1601.3 & Exceptions 1 & 2
1601.5
1601.6
1601.7
1602.4
1602.7~~~~(Ref. 1602.7.3)
1602.9.3
1602.9.4
1602.9.6
1602.9.6.1
Table 1602.9.6
1603.4
1603.5
1603.6
1603.7~~~~A, B
1603.9
1603.15
1604.1 - 1604.3
1605.3
1605.3.2
1605.3.3
1605.3.4		 X X
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1601.2
1601.3 & Exceptions 1 & 2
1601.5
1601.6
1601.7
1602.4
1602.7 (Ref. 1602.7.3)
1602.9.3
1602.9.4
1602.9.6
1602.9.6.1
Table 1602.9.6
1603.4
1603.5
1603.6
1603.7 A, B
1603.9
1603.15
1604.1 - 1604.3
1605.3
1605.3.2
1605.3.3
1605.3.4		 BSC BSC-
CG		 SFM HCD DSA OSHPD BSCC DPH AGR DWR CEC CA SL SLC

Adopting Agency
Adopt Entire Chapter
Adopt Entire Chapter as
amended (amended sections
listed below)
Adopt only those sections
that are listed below
Chapter/Section
1601.1
1601.2
1601.3 & Exceptions 1 & 2
1601.5
1601.6
1601.7
1602.4
1602.7~~~~(Ref. 1602.7.3)
1602.9.3
1602.9.4
1602.9.6
1602.9.6.1
Table 1602.9.6
1603.4
1603.5
1603.6
1603.7~~~~A, B
1603.9
1603.15
1604.1 - 1604.3
1605.3
1605.3.2
1605.3.3
1605.3.4


†
†

The Office of the State Fire Marshal’s adoption of this chapter or individual sections is applicable to structures regulated by other state agencies pursuant to Section 1.11.0.

2019 CALIFORNIA PLUMBING CODE 325

326 2019 CALIFORNIA PLUMBING CODE

CHAPTER 16

NONPOTABLE RAINWATER CATCHMENT SYSTEMS

1601.0 General.1601.1 Applicability. The provisions of this chapter shall

apply to the installation, construction, alteration, and repair of nonpotable rainwater catchment systems.

1601.1.1 Allowable Use of Alternate Water. Where approved or required by the Authority Having Jurisdiction, rainwater shall be permitted to be used instead of potable water for the applications identified in this chapter.

1602.0 Nonpotable Rainwater Catchment Systems.1602.1 General.

The installation, construction, alteration, and repair of rainwater catchments systems intended to supply uses such as water closets, urinals, trap primers for floor drains and floor sinks, irrigation, industrial processes, water features, cooling tower makeup and other uses shall be approved by the Authority Having Jurisdiction.

1603.0 Rainwater Storage Tanks.1603.1 General.

Rainwater storage tanks shall be constructed and installed in accordance with Section 1603.2 through Section 1603.9.

1605.0 Inspection and Testing.1605.1 General. Rainwater catchment systems shall be

inspected and tested in accordance with Section 1605.2 and Section 1605.3.

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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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