NPDES Permit Program Authorization Letters
These letters from the U.S. Environmental Protection Agency (EPA) authorize states to issue NPDES permits to point sources and pretreatment facilities. File names indicate what type of permits EPA authorized: NPDES = individual NPDES permits, GP = General Permits, PT = Pretreatment, SW = Stormwater. At this time, only coastal and Great Lakes states are included. Some states' letters are missing because EPA is unable to locate the letters.
Alaska NPDES
Alabama NPDES
California PT & GP Federal Register notice
California PT
Connecticut GP
Connecticut NPDES
Connecticut PT
Delaware GP
Florida NPDES
Georgia NPDES
Georgia GP
Georgia PT
Hawaii NPDES
Hawaii PT
Illinois GP
Illinois NPDES
Indiana GP
Indiana NPDES
Louisiana NPDES
Maryland NPDES
Maryland GP
Maryland PT
Maine NPDES
Maine Tribes NPDES
Michigan NPDES
Michigan GP
Michigan PT
Michigan PT Reapproval
Michigan SW
Minnesota NPDES
Minnesota GP
Minnesota PT
Minnesota Vessels Letter
Mississippi NPDES
Mississippi GP
Mississippi PT
Mississippi PT 2
North Carolina NPDES
North Carolina GP
North Carolina PT
New Jersey NPDES & PT
New York NPDES
New York GP
Ohio NPDES
Ohio GP
Ohio PT
Oregon GP
Oregon PT
Rhode Island NPDES
South Carolina NPDES
South Carolina GP
South Carolina PT
Texas NPDES
Virginia NPDES
Virginia NPDES Interim
Virginia PT
Virgin Islands NPDES
Virgin Islands GP
Washington NPDES
Washington NPDES Revised
Washington GP
Wisconsin NPDES
Wisconsin GP
Wisconsin PT