California Code, Government Code - GOV § 29820

(a) By stamping thereon or perforating therein the word “Paid” and the date of payment.

(b) In accordance with those practices with respect to form, issuance, delivery, endorsement, and payment as approved by the governing board pursuant to Section 53910.

(c) By accepting the paid data per the treasurer's bank.

At the option of the treasurer, warrants may be payable at the treasurer's office or at any bank at which money of the county is deposited.