California Code, Government Code - GOV § 53069.9

(a) Any public agency providing water for fire protection purposes may, by ordinance or resolution, fix and collect a charge to pay the costs of operation, installation, capital, maintenance, repair, alteration, or replacement of facilities and equipment related to supplying water for fire protection purposes.

Except as provided in subdivision (b), any such charge fixed pursuant to this section, may be made on all land within the public agency to which water is made available for fire protection purposes.  The legislative body of the agency which fixes such a charge may establish schedules varying the charges in different localities within the agency depending on the cost of operation, installation, capital, maintenance, repair, alteration, or replacement of facilities and equipment related to supplying water for fire protection purposes.  Such charges may be collected at the same time and in the same manner as other water rates or water charges collected by the public agency.

(c) For the purposes of this section, “entity providing fire protection services” means a city, county, or city and county, whether general law or chartered, or a fire company, fire protection district, or any other person, association, company, corporation, district, municipal corporation, or any other public or private entity, which public or private entity or person provides fire protection services to any other public or private entity or person.