Ohio Rev. Code Ann. § 6111.54

Each state agency in possession of surface water quality data shall submit the data to the environmental protection agency in a format designated by the director of environmental protection. Each such agency shall submit the data to the director at the same time that the agency compiles or summarizes the data for its own use, but at a minimum shall submit the data to the director annually. If the director determines that the data were collected in accordance with the rules adopted under section 6111.51 of the Revised Code, the director shall approve the data as credible.