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Onsite Treatment and Reuse of Nonpotable Water Public Hearing
- Notice of Proposed Rulemakng published for the Onsite Treatment and Reuse of Nonpotable Water Regulation; public hearing May 8, 2025; written comments due noon, May 9, 2025
- Hexavalent chromium MCL last date for initial monitoring sample collection: April 1, 2025
- 2025 Division of Drinking Water Regulatory Priorities Adopted
The State Water Resources Control Board (State Board) proposes to amend or adopt the regulations described below after considering all comments, objections, and recommendations regarding the proposed regulatory action
SUMMARY OF PROPOSED REGULATORY ACTION
The State Board proposes to amend California Code of Regulations, Title 22, Division 4
for the purpose of adding Chapter 3.5 to provide uniform statewide criteria for onsite
treated nonpotable water systems (OTNWS). The adoption of the proposed regulations
will establish risk-based water quality standards for the onsite treatment and reuse of
nonpotable water for nonpotable end uses in multifamily residential, commercial, and
mixed-use buildings.
Untreated graywater systems that are used exclusively for subsurface irrigation and
untreated rainwater systems that are used exclusively for surface, sub-surface, or drip
irrigations, which are regulated by Chapter 15 and Chapter 16 of the California
Plumbing Code (Part 5 of Title 24 California Code of Regulations), will not be addressed
by these proposed regulations
If you wish to view or listen to the workshop only, a webcast will be available at
While a quorum of the State Board may be present, this hearing is for the public to
provide comments in accordance with the APA. The Board will not take formal action on
this matter. Final regulations are expected to be considered for adoption by the Board in
late 2025/early 2026, after consideration of all written and oral comments.
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