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NPDES Storm Water Permitting Requirements Information

- ATTENTION -
All storm water general permit applications must be accompanied by the following fees:
1 year - $175.00     3 years - $350.00     4 years - $525.00     5 years - $700.00

Storm water general permit applications may be submitted online at:
Online Storm Water General Permit Application


History of Storm Water NPDES Permitting Requirements

Amendments made in 1987 to the Federal Clean Water Act required the U.S. Environmental Protection Agency (EPA) to develop regulations for storm water discharges from "industrial activities."  Storm water regulations were established by EPA under the National Pollutant Discharge Elimination System (NPDES) permit requirements for certain types of industrial facilities and industrial activities.  EPA's storm water regulations were published in the Federal Register on the following dates:

  • November 16, 1990,
  • March 21, 1991,
  • November 5, 1991,
  • April 2, 1992, and
  • December 8, 1999. 

These federal regulations established NPDES permit application requirements for industrial facilities and industrial activities.  Since 1978, the Iowa Department of Natural Resources (IDNR) has been delegated by the EPA to administer the federal NPDES wastewater discharge permit program.  In August 1992, IDNR received authorization from EPA to issue general permits for storm water discharges.  IDNR continues to issue NPDES permits to all storm water discharges subject to the federal NPDES permit requirements.


Quality of Storm Water Runoff

The intent of the federal storm water regulations is to improve water quality by reducing or eliminating contaminants in storm water.  Storm water is defined as precipitation runoff, surface runoff and drainage, street runoff, and snow melt runoff.

Storm water runoff from areas where industrial activities occur may contain the following contaminants:

  • toxic substances (lead, zinc, etc.),
  • conventional pollutants (oil and grease, fertilizers, sediment from construction sites), or
  • industrial site contaminants, when material management practices allow exposure to storm water.  

In addition, illicit connections to storm sewers may also exist and can introduce contaminants through storm sewer systems.  Contaminants introduced in storm water runoff or into storm sewers may impact drinking water sources, waters protected for recreation or aquatic life, and other beneficial water uses.


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