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 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 firstname.lastname@epa.ohio.gov 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

Small Municipal Separate Storm Sewer Systems (MS4s) - General Permit

Final Small Municipal Separate Storm Sewer Systems (MS4s) Permit Renewal


On September 11, 2014, Ohio EPA finalized the renewal of the small MS4 general permit, see below for more information.

Issue Date: September 11, 2014
Effective Date: September 11, 2014
Expiration Date: September 10, 2019

The NPDES Small MS4 general permit renewal will afford coverage to regulated Small MS4s, be applicable statewide, and have a duration of 5 years.  This is the third generation of this general permit. The renewal requires a regulated Small MS4 operator’s construction and post-construction requirements, at a minimum, be equivalent with the technical requirements set forth in the current, at time of issuance of this permit, Ohio EPA NPDES General Storm Water Permit for Construction Activities (CGP) applicable for the MS4 operator’s area. This includes the following Ohio EPA NPDES General Storm Water Permits for Construction Activities:

This approach will deter conflicting requirements and allow for a lessened presence of Ohio EPA in regards to the CGP requirements within MS4 jurisdictions. Under this approach, regulated MS4s located within the Big Darby Creek Watershed and portions of the Olentangy River Watershed will need to have their local regulations be, at a minimum, equivalent with the technical requirements set forth in these two Ohio EPA alternative NPDES CGPs. All other regulated MS4s would be required to have their local regulations be, at a minimum, equivalent with the technical requirements set forth in the Ohio EPA statewide NPDES CGP. 

For additional information and permit compliance materials, please see our MS4 Program tab.


For additional information contact:

Anthony Robinson
DSW Storm Water Section
(614) 728-3392