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Noxious Weeds/LMD

Mason Lake is experiencing noxious weeds that started with Milfoil and now includes Sagittaria graminea SAG.  These weeds were brought in from other lakes by boats and trailers who were on lakes that have the same problem.  Mason County is not assisting lake residence in resolving the issue, so a Lake Management District was created and homeowners have an assessment that appears on your property tax statement of funds that are collected for the continuing eradication of these weeds.  Please inspect your and your guest's boats and trailers before launching

The Milfoil Committee:

Michael Koidahl (Chair),  Mark Spaur (Secy/Treas), Peter Reidel, Frank & Rhonda Kincaid, Art Whitson, Susan Summers and Bob St. Clair

Questions may be directed to Michael Koidahl at

Phone: 206-707-2667

You can read the reports in the table below for more details:  


Click here to see photos of the noxious weeds impacting Mason Lake waters.

Click here to see photos and information on fresh water plants, note these photos include noxious weeds.

Washington State Noxious Weed Control Board:
Guide for shoreline living: