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Published December 2002

King County is a diverse mix of large urban areas, suburban cities, rural areas, farmland, timberland, and alpine wilderness. Most of the lakes are within or in close proximity to urban areas and are under pressure from urbanization. Since the early 1980s, the value of these lakes for use by people, fish, and wildlife has been greatly impacted by the introduction of invasive (noxious) plants, especially Eurasian milfoil (Myriophyllum spicatum).

The U.S. Congress Office of Technology Assessment has recognized Eurasian milfoil as a "harmful non-indigenous species." Eurasian milfoil is also on the State of Washington's Noxious Weed List. This list includes those plants that are exotic, invasive, and are known to cause detrimental impacts to the state's resources including the environment.

King County recognized the benefits of developing a regional plan that would provide a more efficient and focused approach for combating the spread of Eurasian milfoil. The result is the Regional Eurasian Milfoil Control Plan, which provides basic lake and watershed information, milfoil survey results from 38 King County lakes, and examples of plant control goals for different levels of infestation. It also describes available control strategies that are approved to meet selected goals.

The King County Regional Eurasian Milfoil Control Plan is available in Adobe Acrobat format.

Download here

For questions about lakes in King County, please contact or call the Water and Land Resources Division front desk at 206-477-4800.