1. (a) Allowable indoor uses of onsite treated nonpotable water are limited to toilet and urinal flushing, clothes washing, and drain trap priming.

2. (b) Use of onsite treated nonpotable water for clothes washing is allowed if non-potable hot water is available for clothes washing by either:

   1. (1) A clothes washer that has a tankless water heater or a built-in water heater that heats non-potable water at the point of use; or
   2. (2) A building that has a boiler system that provides non-potable hot water to the clothes washer.

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 3 (sections 60620-60624) and section filed 4-22-2026; operative 4-22-2026 pursuant to Water Code section 13558(f) (Register 2026, No. 17).