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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.

Permit documents

Additional documents

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