On Tuesday, June 11, an aquatic herbicide will be applied to the waters of the swim beach and boat harbor at Gene Coulon Memorial Beach Park and at Kennydale Beach Park for the treatment of milfoil, an aquatic non-native weed that flourishes in Washington.

An additional treatment will occur on June 12, if it cannot be completed on June 11.

The product used for this application is safe for humans and animals and is authorized by the Washington State Department of Ecology.

Milfoil is a feathery weed that can tangle up people, boat propellers, and fishing lines. It chokes out native plants, spreads rapidly to new areas and has few natural controls.

Once established, it is very difficult to remove through mechanical removal efforts since any piece of it can grow into a full-sized plant making aquatic treatment the most effective solution.

The process includes applying an aquatic herbicide below the surface of the water, which then settles on the plants. Gene Coulon Memorial Beach Park swim area and Kennydale Beach Park will be closed on June 11 to conduct the application.

Aquatechnex LLC, the contractor conducting the application, has notified area residents and has posted signs.

For more information, contact Kelly Beymer, Parks and Golf Course Director at 425-430-6600.