California Code, Government Code - GOV § 66483.2

(a) There shall be refunded to the current owners of property for which a fee was previously collected, the balance of such moneys in the same proportion which each individual fee collected bears to the total of all individual fees collected from the particular drainage or sewer area;

(b) Where property for which a fee was previously collected has subsequently been subdivided into more than one lot, each current owner of a lot shall share in the refund payable to the owners of the property for which a fee was previously collected in the same proportion which the area of each individual lot bears to the total area of the property for which a fee was previously collected; and

(c) There shall be transferred to the general fund of the county or city any remaining portion of the surplus which has not been paid to or claimed by the persons entitled thereto within two years from the date either of the completion of the improvements, or the adoption by the legislative body of a resolution declaring a surplus, whichever is later to occur.