Cal. HSC § 5062

The necessary intercepting sewers and appurtenant works for connecting the works of the owner-district with the sewerage system of the lessee-district shall be constructed by the owner-district or the lessee-district, or both, upon such terms and conditions as are set forth in the contract, and the cost or that part of the cost which is to be borne by the owner-district may be paid as part of the cost of the works from the proceeds of the bonds unless otherwise provided by the ordinance.