Water Code § 10701

(a) As used in this part, “local agency” means any city, county, district, agency, or other political subdivision of the state for the local performance of governmental or proprietary functions within limited boundaries.

(b) As used in this part, “groundwater” and “groundwater resources” do not include those subsurface waters incidentally produced in connection with or as a result of natural resource extraction activities when the disposal of those subsurface waters is regulated by state or federal law.