California Code, Health and Safety Code - HSC § 116345

(a) The local health officer shall submit a report monthly to the department regarding the status of compliance with this chapter by the public water systems under the jurisdiction of the local health officer. The report shall be in a form and manner prescribed by the department.

(b) The department shall review the public water system program of the local health officer at least every three years to assure compliance with this chapter. A report of the findings of the review along with any recommendations of the department shall be provided to the local health officer and the board of supervisors.