NPDES Pesticides General Permit (GP #7)

In accordance with Federal Requirements in the Clean Water Act, the NPDES section developed a general permit for the application of pesticides to Waters of the United States (WOUS).  Coverage under this permit is required for pesticide applications that result in residue discharges to WOUS.  Applicable pesticide applications include those for control of mosquitoes and other aquatic nuisance insects, control of weeds, algae, bacteria, fungi and fish parasites, control of aquatic nuisance animals, and forest canopy pest control.

Current Pesticides General Permit

The Final Rule concerning the pesticides General Permit (PGP) was adopted at the Environmental Protection Commission (EPC) meeting on January 18, 2011.  The Pesticide General Permit for Point Source Discharges to Waters of the United States from the Application of Pesticides become effective March 30, 2011.

Please see the links below for more information concerning the PGP and the waterbodies referenced in the permit.

Final General Permit #7 and Additional Information PDF Link
Pesticides General Permit #7 PDF File Format
Pesticides General Permit Rationale PDF File Format
Pesticide General Permit Summary Tables PDF File Format
Waterbody Reference Tables for Pesticides General Permit PDF Link
Iowa Waterbodies Designated for Drinking Water Use (Class C) PDF File Format
Outstanding Iowa Waters (OIW) PDF File Format
Topeka Shiner Habitat Maps PDF File Format

Renewal of the Pesticides General Permit

The Pesticides General Permit (GP 7) expires on March 29, 2016. The Notice of Intended Action (NOIA) to renew GP 7 was approved by the Environmental Protection Commission at their meeting on February 16, 2016. Please see section 10 of the EPC February Agenda to view the pre-publication version of the NOIA. The NOIA was published in the Iowa Administrative Bulletin on March 16, 2016 as ARC 2441C

DNR will host a public hearing on the GP 7 NOIA on Tuesday, April 5, 2016 at 10:00 am in the 4th floor conference rooms of the Wallace State Office Building at 502 East 9th Street in Des Moines.  Written comments or questions about the proposed General permit and the NOIA should be directed to Wendy Hieb, Iowa Department of Natural Resources, NPDES Section, 502 East 9th St., Des Moines, Iowa 50309-0034; via fax at 515-725-8202; or via email at Comments may be submitted on or before April 12, 2016.  The EPC intends to file these amendments as Adopted and Filed Emergency After Notice, to be effective on May 18, 2016, pursuant to Iowa Code section 17A.5(2)“b”(2), following public comment and public hearings.

  For more information on the PGP or the PGP forms, please contact:

Wendy Hieb 515-725-8405
Courtney Cswercko 515-725-8411

For more information on EPA's NPDES permit for pesticides, please see EPA's Pesticides page.