Current NPDES Permits

List of Individual NPDES and Operation Permits in Iowa

The Permit Listing files linked below contain information on facilities that hold individual NPDES or state operation permits and are authorized to discharge wastewater to surface waters in Iowa. The files contain the name, address, discharge location, and other commonly requested information on each permitted discharge. The files do not contain information on any of the discharges authorized under the NPDES General Permits, including stormwater General Permits #1, #2, and #3. The Excel file can be downloaded and manipulated to provide customized lists of information, and the pdf file can be downloaded in the event Excel is not installed on your computer.

Permit Listing Spreadsheet Permit Listing These documents were last updated on September 18, 2024.

Individual permit documents (final and draft permits, rationales, etc.), are available on the Wastewater Permit Information Exchange (WWPIE) system. The search function can be used to find the permit documents for any individual NPDES or state operation permits in Iowa. Please note, authorizations under general Permits Nos. 1 - 9 are not included in WWPIE and facilities covered by these permits will not appear in the WWPIE search. Only final and draft individual, non-stormwater NPDES and state operation permits are included. Expired, closed, and revoked permits are not searchable or available in WWPIE.

Questions on the list of individual NPDES and state operation permits or on WWPIE should be directed to Courtney Cswercko at courtney.cswercko@dnr.iowa.gov.

List of Authorizations Under General NPDES Permits in Iowa

The Permit Listing files linked above do not contain information on any of the discharges authorized under the Iowa NPDES General Permits.

For information on the discharges authorized under General Permits #1 for Stormwater Discharge Associated with Industrial Activity, #2 for Stormwater Discharge Associated with Construction Activities, or #3 for Stormwater Discharge Associated with Industrial Activity from Asphalt Plants, Concrete Batch Plants, Rock Crushing Plants and Construction Sand and Gravel Facilities, please go to the Online Stormwater Permit database.

For information on the discharges authorized under General Permits #5 for Mining/Processing, #8 for Discharge from Hydrostatic Testing, Ballasting, and Water Lines, or #9 for Dewatering and Residential Geothermal Systems, please use the link to the General Permits 5, 8 and 9 Database available on the NPDES Databases page.

There is currently no listing of the discharges authorized under General Permits #4, #6, and #7 on the Iowa DNR website. For more information on these general permits, please see the NPDES General Permits page.