State Implementation Plans (SIP)

General Information

This page contains the links to various state implementation plan (SIP) packages for recent submittals made by Ohio EPA.

SIP actions can take several forms: from the development of plans that will demonstrate how areas not yet attaining National Ambient Air Quality Standards (NAAQS) will attain said standards ("Attainment Demonstration"); to plans that provide for how an area redesignated to attainment from nonattainment will maintain acceptable air quality ("Redesignation Request"). SIPs packages or revisions also are prepared and submitted to U.S. EPA to modify, revise or update existing plans. Additional SIP related documents are also generated when a new or revised standard is promulgated by U.S. EPA. For example, Ohio EPA submits a "Recommended Designations" document with proposed nonattainment boundaries. 

Many of the SIP related documents are available for public comment. When Ohio EPA is accepting comments related to the SIP program, a public notice is provided to Ohio's major newspapers and this website will be updated with public comment and hearing information.

A summary of U.S. EPA's current NAAQS and Ohio’s attainment status can be found here. The only pollutants for which there are portions of Ohio designated nonattainment are ozone and sulfur dioxide. The entire state is in attainment for PM2.5, PM10, nitrogen dioxide, lead and carbon monoxide.

If you would like to receive e-mail notifications regarding opportunities to provide comment regarding important changes to Ohio’s SIP, please go to Ohio EPA's Customer Support Center, log-in or sign-up to create a new account, and choose "Information on activities related to Ohio’s State Implementation Plan" from your subscriptions.

Table of Contents

For questions or comments concerning this page, contact Jennifer Van Vlerah.

 As a precautionary response to COVID-19, Ohio EPA is currently operating with most staff working remotely. If you are working with our staff on a current project and you know the name of the employee you are working with, email them at or call them directly. The Agency website has contact information for every district, division, and office. In order to reach us, please contact Ohio EPA’s main phone line at (614) 644-3020 or the main line for the division or office you are trying to reach.

After March 23, our district offices and Central Office will be temporarily closed and will have increasingly limited ability to receive deliveries, plans, etc. All entities are encouraged to submit plans, permit applications, etc., electronically where there are existing avenues to do so, such as the eBusiness Center (eBiz). Please refer to the list of available services on the main eBiz webpage. We encourage you to make use of all that apply, even if you have not used eBiz in the past. Plans under 25 MB can be emailed. For large plans over 25 MB, entities should work with the reviewer/division to upload via LiquidFiles. Directions for submitting docs via LiquidFiles is available on YouTube. We apologize for the inconvenience and thank you in advance for your understanding. If you wish to send hard copies of documents to any of Ohio EPA’s district offices, the best method to ensure we receive these documents is to send them via U.S. Mail. Since all offices are closed, deliveries outside of U.S. Mail (FedEx, UPS) will likely be returned because the offices are closed and deliveries cannot be made.

To report a spill or environmental emergency, contact the spill hotline (800) 282-9378 or (614) 224-0946