An official website of the United States government.

This is not the current EPA website. To navigate to the current EPA website, please go to This website is historical material reflecting the EPA website as it existed on January 19, 2021. This website is no longer updated and links to external websites and some internal pages may not work. More information »

EPA in Ohio

Ohio (Part 63) MACT Standards Delegations

Clean Air Act Section 112 Major and Area Source Standards

EPA's final delegation approval of Section 112 NESHAP standards for Ohio constitutes a program of straight delegation of all existing and future air toxic standards regardless of a source's Part 70 (Title V) applicability with the exception of the Coke Oven standard (40 CFR part 63 subpart L).

In 1994, EPA gave approval to Ohio EPA for its Title V program. Under this approval, a mechanism was established by which Ohio EPA was granted authority to implement and enforce present and future Section 112 NESHAP standards. Ohio EPA will have the authority to implement each Section 112 standard as promulgated unless Ohio EPA notifies EPA differently.

Ohio EPA will enforce Section 112 NESHAP standards through the Title V permit, federally enforceable state operating permit and the new source review permit programs. Pursuant to Ohio Revised Code §3704.036(A), Ohio EPA has the authority to include Section 112 requirements in Title V permits. Therefore, delegation will be implemented on a source by source basis. 

Federal Register Documents for Approval of Section 112(l) Program of Delegation

The Ohio Database will be made available as a spreadsheet.

You may need a PDF reader to view some of the files on this page. See EPA’s About PDF page to learn more.