Cal. Water Code § 37964

The district may, by ordinance, establish an operator’s extraction allocation for each groundwater extraction facility located within the district. The district may, by ordinance, impose upon the operator of any groundwater extraction facility located within the district, extraction surcharges, including volumetric surcharges intended to provide an incentive for reduced water use, for extractions in excess of his or her extraction allocation and late penalties for nonpayment of extraction surcharges.