Cal. Health & Saf. Code § 116465
Upon formal complaint by the director alleging that additional facilities are necessary to provide the users of a public water system operated by a public utility under the jurisdiction of the Public Utilities Commission with a continuous and adequate supply of water or to bring the water system into conformity with secondary drinking water standards, the commission may, after hearing, direct the public utility to make the changes in its procedures or additions to its facilities as the commission shall determine are necessary to provide a continuous and adequate supply of water to the users thereof or to bring the system into conformity with secondary drinking water standards. Any proceeding of the commission pursuant to this article shall be conducted as provided in Chapter 9 (commencing with Section 1701) of Part 1 of Division 1 of the Public Utilities Code, and any order issued by the commission pursuant to this action shall be subject to judicial review as provided in Chapter 9.
Ca. Health and Saf. Code § 116465