Ohio EPA and Ohio DNR appear to have reached agreement on a policy regarding the use of POTWs for brine disposal: "Disposing directly into a surface water body, either directly or via a Publicy Owned Treatment Works (POTW), is not listed as one of these options [for brine disposal found in Ohio Rev. Code Section 1509.22]. Moving forward, ODNR does not envision using its authority to allow for discharges to surface waters either directly or via a POTW."
For a copy of the writing, see here.