Chapter 15 — ALTERNATE WATER SOURCES FOR NONPOTABLE APPLICATIONS
1506.5 Water Pressure — 2025 California Plumbing Code
California Plumbing Code (Title 24, Part 5) · 2025 edition · updated 2026-10-23 · 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) § 1506.5 · Effective January 1, 2026 · Official source: Building Standards Commission
On-site treated non-potable gray water systems supplying water to water closets, urinals, and trap primers shall be capable of delivering not less than 15 pounds-force per square inch (psi) (103 kPa) residual pressure at the highest and most remote outlet served. Where the
TABLE 1505.16 MINIMUM RECLAIMED (RECYCLED) WATER SOURCE TESTING, INSPECTION, AND MAINTENANCE FREQUENCY
DESCRIPTION MINIMUM FREQUENCY*
Inspect and clean filters and screens, and replace (where necessary). [Every 3 months.]
Inspect pumps and verify operation. After initial installation and every 12 months thereafter.
Inspect valves and verify operation. After initial installation and every 12 months thereafter.
Inspect pressure tanks and verify operation. After initial installation and every 12 months thereafter.
Clear debris from and inspect storage tanks, locking devices, and verify operation.
After initial installation and every 12 months thereafter.
Inspect caution labels and marking. After initial installation and every 12 months thereafter.
* Note: Frequency is as described in this table, or more frequently as required by manufacturer’s instructions and/or the Authority Having Jurisdiction.
water pressure in the on-site treated non-potable gray water supply system within the building exceeds 80 psi (552 kPa), a pressure reducing valve reducing the pressure to 80 psi (552 kPa) or less to water outlets in the building shall be installed.
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