(a) A complete book of all accounts and records shall be kept by the district.
(b) In January of each year or as soon after that time as practicable, the county auditor or, in the discretion of the commission, an independent certified public accountant or firm of independent certified public accountants shall be employed to make a complete audit of the books and records and make a report of the findings.
(c) The audit report shall be made in triplicate, and one copy shall be filed with the district office, one with the district depository, and one with the county auditor's office.