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Earlier editions: 20222019

Ch. 15 Alternate Water Sources for Nonpotable Applications — 2025 California Plumbing Code

California Plumbing Code (Title 24, Part 5) · 2025 edition · updated 2026-10-19 · California

CBSC: official editions, supplements and errata

Italicized text is a California amendment to the model code, as printed in the official publication.

Cite as: 2025 California Plumbing Code (Title 24, Part 5) Chapter 15 · Effective January 1, 2026 · Official source: Building Standards Commission

(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.)

Adopting Agency BSC BSC-CG SFM HCD 1 HCD 2 HCD 1-AC DSA AC DSA SS DSA SS/CC OSHPD 1 OSHPD 1R OSHPD 2 OSHPD 3 OSHPD 4 OSHPD 5 OSHPD 6 BSCC DPH AGR DWR CEC CA SL SLC
Adopt Entire Chapter X X X X X X X X
Adopt Entire Chapter as amended (amended sections listed below) X X
Adopt only those sections that are listed below X X X
Chapter/Section
1501.0 X
1501.1 X X X
1501.1.1 X X X
1501.2 X X X
1501.2 Exceptions X
1501.3 X
1501.3 & Exception X X
1501.4 X
1501.5 X X X
1501.5 Exception X
Table 1501.5 X †
1501.5.1 X
1501.6 X X X
1501.7 X X X
1501.8 X
1501.9 X X X X X
1501.9. 1 X X X X
1501.9. 2 X X X
1501.10 X
1502.0 X
1502.1 X X
1502.1 Exception X
1502.3 X X
1502.3.2 X X
1502.3.3 X X
1502.4 Exception X
1502.5 - 1502.6 X
1503.0 X
1503.1 X X
1503.1.1 X
1503.1.1 - 1503.1.3 X X
1503.2 - 1503.2.3 X X
1503.2.2 Exception X
1503.3 & Exceptions X X X
1503.4 Exception X X
Table 1503.4 X X

CHAPTER 15 - ALTERNATE WATER SOURCES FOR NONPOTABLE APPLICATIONS (continued) (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.)

Adopting Agency BSC BSC-CG SFM HCD 1 HCD 2 HCD 1-AC DSA AC DSA SS DSA SS/CC OSHPD 1 OSHPD 1R OSHPD 2 OSHPD 3 OSHPD 4 OSHPD 5 OSHPD 6 BSCC DPH AGR DWR CEC CA SL SLC
Adopt Entire Chapter X X X X X X X X
Adopt Entire Chapter as amended (amended sections listed below) X X
Adopt only those sections that are listed below X X X
Chapter/Section
1503.5 Exception X X
1503.6 X X
1503.7 Exceptions 2 & 3 X X
1503.8 Exception X X
1503.8.1 X
1503.8.2 X
1503.8.2.1 - 1503.8.2.3 X
1503.8.3 X X
1503.9 X X
1503.9.1 X X
1503.9.3 - 1503.9.4 X X
Table 1504.2 X X
1504.3 Exceptions 1 & 2 X X
1504.4 Note X X
1504.5 - 1504.5.3 X X
Table 1504.5.3 X X
1504.8 X X
1504.9 X X
1504.9.1 X X
1504.11 X X
1505.0 - 1505.16 † † † X
Figure 1505.10 X
Table 1505.16 † † X
1506.0 - 1506.4 Exceptions X X
1506.4 & Exceptions X
1506.5 X X
1506.6 - 1506.10.6 X X
1506.12 X X X
1506.13 X X

This state agency does not adopt sections identified with the following symbol: 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.

CHAPTER 15

ALTERNATE WATER SOURCES FOR NONPOTABLE APPLICATIONS

1501.0 General.

1502.0 Inspection and Testing.

1503.0 Gray Water Systems.

[BSC-CG] Gray water sys- tems shall be verified in accordance with the California Green Building Standards Code (CALGreen), Chapter 5, Division 5.3.

Exceptions & meaning →

1504.0 Subsurface Irrigation System Zones.

Exceptions & meaning →

1505.0 Recycled Water Supply Systems in Buildings.

1505.0 Recycled Water Supply Systems in Buildings .

Exceptions & meaning →

1506.0 On-Site Treated Nonpotable

Gray Water Sys- tems.

Exceptions & meaning →

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