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.  The most recent draft version is available here: Draft Pesticides General Permit, 8-21-2015.

The DNR is seeking input from people who apply pesticides to Iowa waters at an informal stakeholder meeting Sept. 9 in Des Moines.  The meeting will be held from 10:30 a.m. to noon in the fourth floor conference rooms of the Wallace State Office Building, 502 E. Ninth St., Des Moines.

Please note: the State Parking Garage will be undergoing construction through October 2nd. The garage will still be open but space may be limited. Please allow extra time for parking and refer to for more parking options.

As part of the renewal, the DNR is proposing to remove Notice of Intent requirements to simplify the permit and reduce regulatory burdens. The DNR will present the latest information about proposed changes and seek input from attendees on the permit at the stakeholder meeting.

Comments on the draft permit will be taken at the stakeholder meeting.  People may also file written comments or questions on the proposed general permit on or before midnight on Sept. 11, 2015. Written 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.