Ohio Rev. Code § 1509.05: Permit required to drill, reopen, convert or plug back well.

No person shall drill a new well, drill an existing well any deeper, reopen a well, convert a well to any use other than its original purpose, or plug back a well to a source of supply different from the existing pool, without having a permit to do so issued by the chief of the division of oil and gas resources management, and until the original permit or a photostatic copy thereof is posted or displayed in a conspicuous and easily accessible place at the well site, with the name, current address, and telephone number of the permit holder and the telephone numbers for fire and emergency medical services maintained on the posted permit or copy. The permit or a copy shall be continuously displayed in that manner at all times during the work authorized by the permit.