Cal. Health and Safety Code § 116660

(a) Any person who operates a public water system without having an unrevoked permit to do so, may be enjoined from so doing by any court of competent jurisdiction at the suit of the department. (b) When the department determines that any person has engaged in or is engaged in any act or practice that constitutes a violation of this chapter, or any regulation, permit, standard, or order issued or adopted thereunder, the department may bring an action in the superior court for an order enjoining the practices or for an order directing compliance. (c) Upon a showing by the department of any violation set forth in subdivision (b), the superior court shall enjoin the practices and may do any of the following: (1) Enforce a reasonable plan of compliance, including the appointment of a competent person, to be approved by the department, and paid by the operator of the public water system, who shall take charge of and operate the system so as to secure compliance. (2) Enjoin further service connections to the public water system. (3) Afford any further relief that may be required to insure compliance with this chapter.