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State Water Board adopts on-site nonpotable reuse regulations required by SB 966
Summary
The board adopted risk-based statewide regulations implementing SB 966 to govern building-scale on-site treatment and reuse of nonpotable water, setting pathogen log-reduction criteria, an implementation timeline for rulemaking (OAL package due by 03/21/2026) and delegating permitting authority to local jurisdictions.
The State Water Resources Control Board voted to adopt proposed regulations establishing statewide criteria for on-site treatment and reuse of nonpotable water, fulfilling requirements of Senate Bill 966.
Staff said the risk-based regulations focus on building-scale installations in urban settings, provide prescriptive pathogen log-reduction treatment trains for indoor and certain outdoor uses, and are intended to complement — not replace — Title 22 recycled-water ("purple pipe") rules. Shirley Rosalella (technical lead) and Randy Barnard (staff presenter) explained that the regulations cover…
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