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

Small MS4 General Permit Renewal (Final General Permit OHQ000004)

Current General Permit - OHQ000004

Issuance Date: April 1, 2021
Effective Date: April 1, 2021
Expiration Date: March 31, 2026

• General Permit OHQ000004
• Public Notice
• Fact Sheet
• Responsiveness Summary to Comments Received
• Generic Renewal Notice
• Guidance for MS4 Operated Industrial Facilities
• IDDE Reporting Form

Previous General Permit - OHQ000003

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

• Downloadable Lists of Dischargers Covered under Ohio EPA's NPDES General Permits
• Public Notice 
• Response to Comments 
• General Permit OHQ000003 
• Annual Report Form
• Permit Application Forms
• Guidance for MS4 Operated Industrial Facilities

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 operators 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 operators area. This includes the following Ohio EPA NPDES General Storm Water Permits for Construction Activities:

• Statewide CGP (OHC000004)
• Big Darby Creek Watershed CGP (OHCD00002)
• Olentangy River Watershed CGP (OHCO00002)

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.