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Aquatic Herbicides for Lakes and Ponds

Aquatic herbicides are used to reduce the abundance of invasive species to reduce spread to new water bodies, to help maintain a healthy native plant community that is beneficial for fish and other aquatic organisms, to improve navigational access to lakes and rivers and make boat navigation safer, and to control nuisance plant and algae growth that can pose a hazard to swimmers.

The amount of time an herbicide will stay in the water varies greatly based on a number of different factors, including the type of herbicide used. Residues may only be present in the water for a few hours, or for as long as a few months. Each herbicide has different characteristics that affect where the chemical moves (e.g. if it stays in the water column or settles into the sediment), how it is broken down, and how long it can be detected in water, sediments, and aquatic organisms. For more information on the environmental fate of a particular herbicide, please see the following:

Shoreline Knowledge Base Biology and Control of Aquatic Plants

Biology and Control of Aquatic Plants 
EPA Signal Word Definitions

Wisconsin Department of Natural Resources individual chemical fact sheets:

2,4-D Chemical Fact Sheet
Bispyribac Sodium Chemical Fact Sheet
Copper Compounds Chemical Fact Sheet
Diquat Chemical Fact Sheet
Endothall Chemical Fact Sheet
Flumioxazin Chemical Fact Sheet

Fluridone Chemical Fact Sheet
Glyphosate Chemical Fact Sheet
Imazamox Chemical Fact Sheet
Imazapyr Chemical Fact Sheet
Penoxsulam Chemical Fact Sheet
Triclopyr Chemical Fact Sheet