On June 30 of each year, the individual trustees or corporate trustee, as the case may be, of a perpetual care trust fund shall have an audit of the perpetual care trust fund made by a certified public accountant except as otherwise provided in section 12-531. The report of such audit by the auditor shall be filed within thirty days after June 30 of such year with the county clerk of the county in which the cemetery is located. The expense of the audit and the filing fee of the report shall be paid by the cemetery association.