California Code, Water Code - WAT § 9539

No bid for any parcel shall be accepted less than the aggregate sum then due for the installment or installments thereon, together with the penalty, except that the county treasurer may receive from any purchaser at their face value, in lieu of cash, bonds of the drainage district issued upon the assessment, or their interest coupons, if the bonds or coupons are then matured or will mature within one year after such sale.