Section 51563 Of Article 4. Installments Called To Pay Bonds From California Water Code >> Division 15. >> Part 7. >> Chapter 3. >> Article 4.

. Any part of the installment or any interest thereon which is unpaid at the expiration of 30 days from the date of the notice calling the installment, is delinquent, and 10 percent of the unpaid amount of the installment shall be added thereto and collected by the county treasurer.