(a) The county treasurer is the custodian of:
(1) all money collected under this chapter; and
(2) all taxes collected to pay principal of and interest on bonds issued under this chapter.
(b) The county treasurer shall:
(1) deposit the money collected with the county depository in the same manner as other money of the county; and
(2) promptly pay the principal of and interest on the bonds as they become due from the money collected and deposited for that purpose.