Ohio Rev. Code Ann. § 5301.84

An agency is bound by any obligation that it expressly assumes in an environmental covenant, but an agency does not assume obligations merely by signing an environmental covenant. Any other person that signs an environmental covenant is bound by the obligations that the person assumes in the environmental covenant, but signing the environmental covenant does not change obligations, rights, or protections that are granted or imposed under law other than sections 5301.80 to 5301.92 of the Revised Code, except as provided in the environmental covenant.