Cal. Water Code § 72142.2

After the levy of a production assessment pursuant to this chapter the Chino Basin districts shall give notice thereof to all affected producers within the Chino Basin, within each of their respective boundaries, which notice shall state the rate of each assessment and shall require filing of the annual report of each affected producer, together with payment of the assessment, by the deadline specified in Section 72143. The notice may be sent by postal card or by other first-class mail with postage prepaid by the assessing district.