California Code, Health and Safety Code - HSC § 6520.5

It may, by an order approved by a two-thirds vote of the members of the board, prescribe, revise and collect, fees, tolls, rates, rentals, or other charges for services and facilities furnished by it in connection with its sanitation or sewerage systems. Revenues derived by the district under the provisions of this section may be used for any purpose except the acquisition or construction of additional local street sewers or laterals which are an augmentation to an existing sewer system.