Cal. Gov. Code § 50140
Whenever any statute, ordinance, or regulation requires that as a condition to the erection of one or more buildings or structures, sewers, drains, or other facilities for sewers or drains, or both, be installed, and where, in the opinion of the legislative body of the local agency in which such buildings or structures will be located, laterals or other facilities must be constructed which can be or will be used for the benefit of property other than that on which such buildings or structures are, or will be erected and such sewers, drains, or other facilities are dedicated to the public, the legislative body or bodies of the local agency or agencies in which any portion of such other properties are situated may by contract with the person erecting such buildings or structures agree to reimburse and may reimburse such person for such lateral or other facility. Such contract shall provide that each governing body may collect from any person using the lateral or other facility for the benefit of property subject to the jurisdiction of such governing body but other than the property on which such buildings or structures are erected, a reasonable charge for such use.
Ca. Gov. Code § 50140