CA Water Code Section 32603

(a)

The use of nonpotable water, including recycled water, in accordance with this part is subject to all applicable state regulation.

(b)

This part only applies to a use of water within the district’s service area that is not the subject of a determination pursuant to Article 7 (commencing with Section 13550) of Chapter 7 of Division 7.

(c)

This part is in addition to, and not a limitation upon, any powers of a public agency or a court to prevent the waste or unreasonable use of water.