Ohio Rev. Code Ann. § 3718.041

An installer or manufacturer of a sewage treatment system or component of a system the use of which has been authorized in rules adopted under section 3718.02 of the Revised Code may request from the director of health a written statement acknowledging that the system or component of a system is approved for use in this state and that the approval is equivalent in all respects to the approval of a system or component of a system under section 3718.04 of the Revised Code. The director may approve or deny such a request as the director determines appropriate.