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.
Such charges shall be collected from such other persons, property, or entities pursuant to existing provisions of law which authorize such charges, or from an entity providing fire protection services only pursuant to a written agreement authorizing such charges.
Ca. Gov. Code § 53069.9