Cal. Public Resources Code § 5789.5

(a) A board of directors may charge a fee to cover the cost of any service which the district provides or the cost of enforcing any regulation for which the fee is charged. No fee shall exceed the costs reasonably borne by the district in providing the service or enforcing the regulation for which the fee is charged. (b) Before imposing or increasing any fee for property-related services, a board of directors shall follow the procedures in Section 6 of Article XIII D of the California Constitution. (c) A board of directors may charge residents or taxpayers of the district a fee authorized by this section which is less than the fee which it charges to nonresidents or nontaxpayers of the district. (d) A board of directors may authorize district employees to waive the payment, in whole or in part, of a fee authorized by this section when the board of directors determines that payment would not be in the public interest. Before authorizing any waiver, a board of directors shall adopt a resolution which specifies the policies and procedures governing waivers.