Water Quality Standards Regulations: Ohio
Presented are water quality standards in effect for Clean Water Act (CWA) purposes for this state.
EPA is posting these standards as a convenience to users and has made a reasonable effort to assure their accuracy. For each document listed under "State Standards in Effect for CWA Purposes", EPA has made a reasonable effort to identify parts of the standards that are disapproved or are otherwise not in effect for CWA purposes. Additionally, please note the documents may also contain provisions that EPA does not have the authority and duty to act on under the Clean Water Act because the provisions are not water quality standards.
State Standards in Effect for CWA Purposes
Ohio Water Quality Standards 3475-1-01 through 3475-1-44 and 3475-1-50 through 3475-1-54 (pdf)
(Effective August 16, 2022) This document establishes water quality requirements for all surface waters of the state. Please note that not all provisions are effective for CWA purposes (refer to cover letter for more information).