Treatment Areas 2020
UPDATE 8/18 @ 4:45p: Everyone, we completed the herbicide treatment as planned without any problems. We appreciate the cooperation of all in avoiding use of boats and swimming as we worked. It was not our intention to choose one of the hottest days/weeks of the year!
The 24hr Swim restriction is lifted lake-wide, tomorrow, August 19th, 2020 @ 2:30p.


Liberty Lake residents and users,

This coming Tuesday, August 18th, 2020, LLSWD and our contractor Lakeland Restoration Services will be treating Liberty Lake with herbicide to control aquatic invasive species.

The two target plants are Eurasian watermilfoil and Curlyleaf pondweed. Our treatment is targeted to impact invasive plants only, by using selective herbicides at very low concentrations.

In order to gain the best effects with this effort, LLSWD has gotten permission from Washington Department of Fish and Wildlife (WDFW), to close the public boat launch from 10:00 pm 8/17/20 – through – 6:00 am 8/19/20. This minimizes the wave, wake, and prop action in the water, which helps us to get the most contact time between our target plant species and the aquatic herbicides that are applied to the lake. If you have a boat on the lake already, we ask that you limit your activities on Liberty Lake during the application on 8/18.
AT A MINIMUM: please stay as far away from our treatment boats and treatment areas (see the map below for where those zones are located.


There is a 24 hour recommended swim/primary contact recreation restriction in and around the treatment zones.

You can see much more information about this annual effort to control aquatic invasive species in Liberty Lake HERE.

For more information, you can contact Jeremy Jenkins – Environmental Manager @, or 509-220-3419

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