Cal. Health & Saf. Code § 6520.10
On or before August 10, the board may certify to the board of supervisors and county auditor a statement of any delinquent and unpaid charges for sewer and other services, or either, requested in writing by the owner of the property that remain delinquent and unpaid for a period of 60 days or more on July 1.
The amount of any charges for sewer and other services, or either, included in the statement of delinquent and unpaid charges shall be added to and become a part of the annual taxes next levied upon the property for which the sewer service was provided and upon the property subject to the charges for any other district services and shall constitute a lien on that property as of the same time and in the same manner as does the tax lien securing the annual taxes. All laws applicable to the levy, collection, and enforcement of ad valorem taxes shall be applicable to the charges, except that if any real property to which the lien would attach has been transferred or conveyed to a bona fide purchaser for value, or if a lien of a bona fide encumbrancer for value has been created and attaches thereon prior to the date on which the first installment of the taxes would become delinquent, then the lien which would otherwise be imposed by this section shall not attach to the real property and the charges relating to the property shall be transferred to the unsecured roll for collection. The county shall deduct from the charges collected an amount sufficient to compensate the county for costs incurred in collecting the delinquent and unpaid charges. The amount of the compensation shall be fixed by agreement between the board of supervisors and the district's board of directors.
Ca. Health and Saf. Code § 6520.10