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 NPDES section is currently working on reissuing the permit, and will present a Notice of Intended Action (NOIA) for the reissuance of the permit to the Environmental Protection Commission at their meeting on February 16, 2016.  Please see the EPC webpage for a link to the agenda and the NOIA.

Comments or questions regarding the proposed rulemaking should be directed to Wendy Hieb, Iowa Department of Natural Resources, NPDES Section, 502 E. Ninth St., Des Moines, Iowa 50309-0034; via fax at 515-725-8202; or via email at

 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.