Water Quality photo identifier

Water Quality Program

Aquatic Noxious Weed Control NPDES General Permit

The general permit covers the indirect discharge of herbicides, adjuvants, and marker dyes into estuaries, marine areas, wetlands, along lake shorelines, rivers, streams, and other wet areas to manage Spartina and freshwater noxious weeds in Washington. An indirect discharge occurs when there may be incidental overspray or dripping of a chemical from the treated plants into waters of the state.

Draft permit for public review

Public comment period

The public comment period is now closed. The public comment period lasted from September 21 - November 4, 2016. We held a workshop and public hearing on October 27, 2016 at 1:00 pm.

Read the public comments

Current permit documents

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Aquatic Pesticide NPDES Permit ListServ

Product to Active Ingredient Conversion Table - End of year reporting must be in pounds of active ingredient.

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