California Code, Public Utilities Code - PUC § 16472.5

(a) In order to enforce the provisions of any ordinance of the district, including an ordinance fixing charges for the furnishing of commodities or services, the district may correct any violation of an ordinance of the district. The district may also petition the superior court for the issuance of a preliminary or permanent injunction, or both, as may be appropriate, restraining any person from the continued violation of any ordinance of the district or for the issuance of an order stopping or disconnecting a service if the charges for that service are unpaid at the time specified in the ordinance.

(b) The district may enter upon the private property of any person within the jurisdiction of the district in order to investigate possible violations of an ordinance of the district. The investigation shall be made with the consent of the owner or tenant of the property or, if consent is refused, with a warrant duly issued pursuant to the procedures set forth in Title 13 (commencing with Section 1822.50) of Part 3 of the Code of Civil Procedure, except that, notwithstanding Section 1822.52 of the Code of Civil Procedure, the warrant shall be issued only upon probable cause.