Normandale Lake Herbicide Treatment

Herbicide Treatment to Occur of Friday, May 8 on Normandale Lake

Curly-lead Pondweed
Curly-leaf Pondweed

An herbicide treatment using diquat occurred on Normandale Lake and one upstream area on Friday, May 8. The herbicide treatment will target remaining curly-leaf pondweed in Normandale Lake following the 2018-2019 drawdown on the lake. Spring plant surveys have confirmed areas in the lake that curly-leaf pondweed in growing and where the treatment will occur. Curly-leaf pondweed is an invasive aquatic plant that makes it difficult for native plants to survive and can affect water quality.

Map of treatment areas: Normandale Lake Herbicide Treatment Areas_2020

boat on a lake with the Normandale towers behind
Herbicide boat on Normandale Lake

A licensed contractor has been hired to complete the herbicide treatment, and the Minnesota Department of Natural Resources has reviewed the treatment plan and issued a permit for the herbicide treatment.

“There are no restrictions on swimming or eating fish from water bodies treated with diquat. Treated water should not be used for drinking water for one to three days, depending on the concentration used in the treatment. Do not use treated water for pet or drinking water for one day following treatment.” (WI DNR)

Additional Information

Diquat Fact Sheet

Normandale Lake Improvement Project