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Integrated weed management program

This summer, Seattle Parks and Recreation (SPR) will begin an integrated weed management program to control Eurasian milfoil and fragrant water lily infestations at its lakefront properties on Lake Washington.

Controlling these weeds will improve water quality and recreational access at freshwater beaches, swim areas, moorages and other high- use recreation locations along the lake.

Mowing, hand cutting, and removal of the weeds will continue as in past years. SPR will complement this work by using selected aquatic herbicides. This use is permitted  by Washington Department of Ecology (Ecology). These herbicides have been screened and endorsed by Ecology as an effective solution to control these noxious and invasive weeds.

SPR has contracted with AquaTechnex, LLC to apply the selected herbicides. AquaTechnex, LLC will manage an online webpage with information and updates on the program.

To learn more about the permit and products:

To follow the project online:

Check back for specific dates of beach closures. 

For further questions, contact Project Coordinator Barb DeCaro,

Eurasian milfoil

Fragrant white water lily