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.
Sections in this part
- 1501.1 Applicability.
- 1501.2 System Design.
- 1501.3 Permit.
- 1501.4 Component Identification.
- 1501.5 Maintenance and Inspection.
- 1501.6 Operation and Maintenance Manual.
- 1501.7 Minimum Water Quality Requirements.
- 1501.8 Material Compatibility.
- 1501.9 Signage.
- 1501.10 System Controls.
- 1502.1 General.
- 1502.2 Supply System Inspection and Test.
- 1502.3 Cross-Connection Inspection and Testing.
- 1502.4 Separation Requirements.
- 1502.5 Abandonment.
- 1502.6 Sizing.
- 1503.1 General.
- 1503.2 System Requirements.
- 1503.3 Connections to Potable and Reclaimed (Recycled) Water Systems.
- 1503.4 Location.
- 1503.5 Plot Plan Submission.
- 1503.6 Prohibited Location.
- 1503.7 Drawings and Specifications.
- 1503.8 Procedure for Estimating Gray Water Discharge.
- 1503.9 Gray Water System Components.
- 1504.1 General.
- 1504.2 Required Area of Subsurface Irrigation Fields, Subsoil Irrigation Fields, and Mulch Basins.
- 1504.3 Determination of Maximum Absorption Capacity.
- 1504.4 Groundwater Level.
- 1504.5 Irrigation, Disposal Field and Mulch Basin Construction.
- 1504.6 Reserved.
- 1504.7 Reserved.
- 1504.8 Gray Water System Color and Marking Information.
- 1504.9 Other Collection and Distribution Systems.
- 1504.10 Testing.
- 1504.11 Maintenance.
- 1505.1 General.
- 1505.2 Permit.
- 1505.3 System Changes.
- 1505.4 Connections to Potable or Recycled Water
- 1505.5 Water Pressure.
- 1505.6 Initial Cross-Connection Test.
- 1505.7 Recycled Water Supply System Materials.
- 1505.8 Recycled Water
- 1505.9 Valves.
- 1505.10 Hose Bibbs.
- 1505.11 Required Appurtenances.
- 1505.12 Pipe Separation in Trenches.
- 1505.13 Signage.
- 1505.14 Inspection and Testing.
- 1505.15 Minimum Water Quality Requirements for Reclaimed (Recycled) Water.
- 1505.16 Maintenance and Inspection.
- 1506.1 General.
- 1506.2 Plumbing Plan Submission.
- 1506.3 System Changes.
- 1506.4 Connections to Potable or Recycled Water
- 1506.5 Water Pressure.
- 1506.6 Initial Cross-Connection Test.
- 1506.7 On-Site Treated Nonpotable
- 1506.8 On-Site Treated Nonpotable
- 1506.9 On-Site Treated Nonpotable
- 1506.10 Design and Installation.
- 1506.11 Valves.
- 1506.12 Signs.
- 1506.13 Inspection and Testing.
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/ |
||||||||||||||||||||||||
| 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/ |
||||||||||||||||||||||||
| 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.
1504.0 Subsurface Irrigation System Zones.¶
1505.0 Recycled Water Supply Systems in Buildings.¶
1505.0 Recycled Water Supply Systems in Buildings .
1506.0 On-Site Treated Nonpotable¶
Gray Water Sys- tems.
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