California Code, Water Code - WAT § 10720.5

(a) Groundwater management pursuant to this part shall be consistent with Section 2 of Article X of the California Constitution.  Nothing in this part modifies rights or priorities to use or store groundwater consistent with Section 2 of Article X of the California Constitution, except that in basins designated medium- or high-priority basins by the department, no extraction of groundwater between January 1, 2015, and the date of adoption of a groundwater sustainability plan pursuant to this part or the approval by the department of an alternative submitted underSection 10733.6, whichever is sooner, may be used as evidence of, or to establish or defend against, any claim of prescription.

(b) Nothing in this part, or in any groundwater management plan adopted pursuant to this part, determines or alters surface water rights or groundwater rights under common law or any provision of law that determines or grants surface water rights.

(c) Water rights may be determined in an adjudication action pursuant to Chapter 7 (commencing with Section 830) of Title 10 of Part 2 of the Code of Civil Procedure.