Aquatic Plant & Algae Management General Permit

We issue the Aquatic Plant and Algae Management General Permit to allow the in-water and shoreline (roadsides, dikes/levees, and ditch banks) management of noxious weeds, native nuisance plants, and algae. The permit also allows for phosphorus inactivation treatments. The permit allows the use of a specific list of aquatic-labeled herbicides, algaecides, biological water clarifiers, adjuvants, marker dyes, shading products, and phosphorus inactivation products into the freshwaters of Washington.

The permit is a combined National Pollutant Discharge Elimination System (NPDES) and State Waste Discharge General Permit.

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Permit documents

Modifications to the 2016 Permit

We modified the 2016 permit to allow the use of additional tools to control aquatic plants, algae, and noxious weeds. These tools include:

• Three herbicides.
• One algaecide.
• Two phosphorous inactivation products.
• Adjuvants registered by the Washington State Department of Agriculture (WSDA).

We accepted comments on the modified permit documents from Nov. 7, 2018 until Dec. 21, 2018. We held two public workshops and hearings on Dec. 10, 2018. We published a Response to Comments as an appendix to the fact sheet to address comments submitted during this period.

Para obtener más información acerca del permiso general modificado, comuníquese con Jon Jennings al 360-407-6283.

Additional documents