Dischargers Covered Under Storm Water Discharge General Permits

This page contains lists of entities having National Pollutant Discharge Elimination System (NPDES) Storm Water General Permit Coverage authorization to discharge to surface waters of Ohio.


Construction Storm Water General Permits (Statewide, Big Darby Creek Watershed and Olentangy River Watershed)


Industrial Storm Water General Permit (OHR000006)


No Exposure Certifications


Marina Storm Water General Permit (OHRM00002)


Small MS4 General Permit (OHQ000003)


The Ohio EPA facility permit number identifies which of our five districts the facility is located within and which general permit coverage has been granted. The first character, 0 - 4, represents which district:

  • 0 - Southeast District Office (SEDO) 
  • 1 - Southwest District Office (SWDO) 
  • 2 - Northwest District Office (NWDO) 
  • 3 - Northeast District Office (NEDO) 
  • 4 - Central District Office (CDO)

The second character, "G" indicates the number is a facility covered by a general permit.

The third character, a letter, indicates which general permit:

  • C - construction storm water 
  • CD - big darby creek watershed construction storm water
  • CO - olentangy river watershed construction storm water
  • R - industrial storm water 
  • Q or Q1 - municipal separate storm sewer systems (MS4s) 

The remaining numbers are specific to each site and the suffix indicates whether it is the site’s initial (*AG) or renewal (*BG, etc.) coverage.