California Code, Streets and Highways Code - SHC § 6468.6

The bonds shall be payable at the office of the treasurer of the city conducting the proceedings.  At least 30 days prior to the first day of July of each and every year after the date of the bonds, until the bonds are paid in full, the treasurer shall mail postage prepaid to the entity whose obligation it is to levy a tax to pay the amount of principal and interest falling due each year, a notice of the amount due in the next succeeding fiscal year, the date when payments are due upon the bonds, and that payment shall be made to the city conducting the proceedings by the entity obligated to levy the tax to make the payments due thereon at least 30 days prior to the due date of any installment of principal or interest upon said bonds.  Failure of the treasurer to notify the entity obligated to make payment shall not affect the obligation of the entity, whose duty it is to make such payment, to make payment thereof as required by Section 5302.5 of this code.  The treasurer shall place the funds in the redemption fund for the payment of such bonds, and interest thereon, such redemption fund to be separate from all other funds and to be used solely for said purpose until the interest thereon and the bonds are paid in full.