An aquatic herbicide will be applied to the waters of the swim beach and boat harbor at Gene Coulon Park to treat milfoil, an aquatic non-native weed that flourishes in Washington.

An additional treatment will occur on Wednesday, if it cannot be completed on June 14.

Milfoil is a feathery weed that can tangle up people, boat propellers and fishing lines. It chokes out native plants and spreads rapidly to new areas and has few natural controls. Once established it is difficult to remove through mechanical removal efforts and aquatic treatment is the most effective solution, according to the City of Renton.

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 14, to conduct the application.

The product used for this application is authorized by the Washington Department of Ecology. Aquatechnex LLC, the contractor, has notified area residents and has posted signs.