Cal. Water Code § 75635

In addition to those remedies set forth in Sections 75615 and 75616, if the operator of a water-producing facility fails to file a water production statement or pay delinquent groundwater charges when due, the district may assess an administrative charge to recover the cost of collection of delinquent unpaid charges. The board may provide by ordinance that in excusable or justifiable circumstances, the administrative charge may be reduced or waived.