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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.

Please note that while the Pesticides General Permit (PGP, General Permit #7, or GP7) provides coverage under the federal Clean Water Act, there are also separate state-based requirements for applying pesticides to public waters. These state requirements must also be followed, and the rules can be found in the Iowa Administrative Code at 571 IAC Chapter 54.

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

Renewal of the Pesticides General Permit

The Iowa DNR is currently drafting a renewal of the Pesticides General Permit. A Stakeholder Meeting was held on Tuesday, May 21, 2019, to seek input on the draft GP7 from individuals, stakeholder groups, and other interested citizens. Download a Redline/Strikeout Version of the draft changes to GP7 or a Clean Draft (current as of August 20, 2019). 

Please note that the Department plans to revise the effective date referenced in the general permit's proposed definition for "Waters of the United States" to reflect the effective date of the Navigable Waters Protection Rule, once the final rule is published in the Federal Register. 

Questions regarding the renewal can be directed to Melinda McCoy via email at melinda.mccoy@dnr.iowa.gov or by phone at 515-725-8402.

Current Pesticides General Permit

The first General Permit for Point Source Discharges to Waters of the United States from the Application of Pesticides (PGP, or GP7) become effective March 30, 2011. The PGP was reissued on May 18, 2016. The current general permit is effective until May 17, 2021.  Please note, Notices of Intent (NOIs) are not required for coverage under the reissued PGP.

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


For questions about the Pesticides General Permit, please contact the DNR staff listed below.

Wendy Hieb, wendy.hieb@dnr.iowa.gov, 515-725-8405 

Melinda McCoy, melinda.mccoy@dnr.iowa.gov, 515-725-8402

Pesticide Discharge to Class C Waters (Drinking Water)

The Pesticides General Permit requires you to obtain prior authorization from the Iowa DNR for pesticide discharges near shallow wells and to Class C (drinking) waters.

In order to request authorization, you will need to complete and submit a Class C Waters Form at least ninety days prior to the planned pesticide application. 

For questions about the Class C Waters form, please contact Michael Anderson, michael.anderson@dnr.iowa.gov, 515-725-0336, in the the Iowa DNR Water Supply section.