Aquatic Weed Projects

Due to legal changes regarding the application of herbicides to waters of the United States (NPDES), Kootenai County Noxious Weed Control will no longer be doing herbicide treatments on any milfoil infested waters in the County. Starting in 2012, all herbicide treatments will be conducted by the Idaho State Department of Agriculture. Learn more about aquatic invasive species control.

Taking Care of Your Water Weeds

Getting tired of all the water weeds around your dock and swim areas. You can do something about it. Water weeds can be managed by lake shore owners by either pulling or cutting the weeds. However you choose to remove the weeds in your area, please remove all pulled or cut weeds from the water and dispose of them on dry land. The homeowners on the lake that are up wind from you would appreciate not having to clean up your weeds from their bay or beach. Jet skiing through weed infested waters only cuts the weeds and makes a mess. Please stay out of these areas. Thank you.

Eurasion Watermilfoil

Eurasion watermilfoil plant on table

Loosestrife Plant

Purple loosestrife plant

Flowering Rush

Flowering rush plant beside pond

Curly Leaf Pondweed Plant

Curly leaf pondweed plant in a persons hand

Eurasion Watermilfoil Flowers

Eurasion watermilfoil flowers in water

Yellow Flag Iris

Yellow flag iris beside body of water

Water Hyacinth

Green water hyacinth in water


ISDA Aquatic Noxious Weed Program

The Aquatic Noxious Weeds Group coordinates statewide aquatic invasive species management and control, acting to protect the integrity of the state's water bodies from the biological degradation caused by aquatic weeds.

Avista Aquatic Weeds

In Coeur d'Alene Lake and the lower St. Joe and St. Maries rivers, Avista and its partners are working to control Eurasian Water Milfoil and a hybrid species of milfoil, which are currently the only known invasive aquatic weed species present within the Coeur d'Alene Lake system.

Hayden Lake Watershed Improvement District

The Hayden Lake Watershed Improvement District is dedicated to the health of the watershed, the quality of the water, and the people who live, work, or play within its boundaries


View the Aquatechnex 2021 Milfoil Update.

Lakeland Restoration Services

Find helpful information regarding terrestrial and aquatic weed control through Lakeland Restoration Services.