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The original item was published from 7/22/2019 3:31:58 PM to 7/22/2019 3:48:24 PM.

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Posted on: July 22, 2019

[ARCHIVED] Treatment Begins for Aquatic Weeds in Lake Ballinger

Airboat on Lake Ballinger

In recent years Lake Ballinger has become infested with invasive aquatic weeds, including Eurasian watermilfoil, fragrant water lilies and curly leaf pondweed. The thick aquatic plant beds that cover most of the nearshore area have negatively impacted boating, swimming, and fishing in the lake. Invasive weeds have also reduced water quality.

In order to address the problem, a steering committee of local residents has recommended a control plan including use of burlap bottom barriers and aquatic herbicide applied to 50 percent of the lake during summer 2019. Lake Ballinger will be treated with aquatic herbicides three times between July 24 and September 15, 2019 with the first treatment happening on Wednesday, July 24. A motorized boat has been permitted on the lake in order to complete this project.

Treatment will be applied to the western shore of Lake Ballinger and the northeastern section near Ballinger Park fishing dock/boat ramp. These herbicides were chosen by the steering committee and have been approved by the U.S. Environmental Protection Agency (EPA) and Department of Ecology for use in potable water sources. There are no restrictions on swimming, fishing, or irrigation with the herbicides (SonarOne and ProcellaCOR with active ingredients Fluridone and Florpyraux-benzyl.) The herbicide treatment is regulated under a permit issued by the Washington State Department of Ecology.

This project is intended to support a more sustainable lake environment through reducing the quantity of invasive aquatic weeds, decreasing phosphorous levels, and improving the quantity of dissolved oxygen in Lake Ballinger.

More background information on the treatments for Aquatic Weed Control in Lake Ballinger can be found in the city’s Integrated Aquatic Vegetation Plan posted on the city’s website or contact Laura Reed, Stormwater Program Manager at or (425) 744-6226.


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