MS4 Permit Spreadsheet

This Excel spreadsheet lists all MS4 permits, by USEPA Region, in the US.  NMSA will update this information periodically.  Filter by state, Phase I or II, permit type, and more. The spreadsheet includes both individual Phase I and II permits and all general MS4 permits. We would appreciate your help keeping this information current. Please email updates to NMSA@nationalstormwateralliance.org.

Download the spreadsheet here.

Credit for the development of this spreadsheet goes to John Kosco, National Association of Home Builders. The spreadsheet was developed while John was under contract with the USEPA while at Tetra Tech.