1. (a) An OTNWS producing onsite treated nonpotable water for indoor uses must have potable water supplied by a public water system serving as a supplemental source of water. Connection to this water supply must be protected by an air gap separation.
2. (b) If recycled water is used as a supplemental source of water ancillary to the supplemental source of water described in subsection (a), it must be disinfected tertiary recycled water as defined in section 60301.230 or better. Connection to recycled water must be protected by an air gap separation.
3. (c) The responsible entity must obtain the public water system's and, if applicable, the recycled water supplier's approval that potable water and/or recycled water will be used as the OTNWS's supplemental source of water. The approval must be obtained prior to the local jurisdiction permit issuance.

Note: Authority cited: Sections 13558 and 13558.1, Water Code; and Sections 116271 and 116350, Health and Safety Code. Reference: Sections 13558 and 13558.1, Water Code.

History

1. New article 6 (sections 60670-60678) and section filed 4-22-2026; operative 4-22-2026 pursuant to Water Code section 13558(f) (Register 2026, No. 17).