California Code, Education Code - EDC § 42671

The county superintendent of schools shall number and date the registered order and shall transmit the registered order to the governing board of the school district which drew the order, and it shall deliver the registered order to the payee or his order. From the date of registration the registered order shall bear interest at the rate of 5 percent per annum until the date upon which notice is given, pursuant to this article, that the county superintendent of schools is ready to approve the registered order.