Aquatic Invasive Species Control

Various aquatic invasive species control efforts have been implemented in Vermont, and many are ongoing. VTDEC permits many AIS control actions, and is directly involved in the implementation of others. Local governments, watershed and lake associations, and other individuals are also involved in a myriad of control efforts around the state.

Mechanical harvesting of water chestnutWater Chestnut Control

VTDEC aggressively manages water chestnut in Lake Champlain and a handful of inland water bodies, primarily on the western side of the state. Both mechanical and hand harvesting methods are used to significantly reduce the negative impacts of this invasive plant in Lake Champlain and other waters in Vermont, and to prevent further spread. Mechanical harvesting targets dense mats and is currently necessary only in southern Lake Champlain. Handpulling continues to be the main control method used at all sites. Notable progress in reducing water Woman in kayak Handpulling water chestnut and filling a laundry basketchestnut populations has been made since efforts began in 1982.  Most significant is a reduction of the Lake Champlain population; dense mats have been reduced from Ferrisburgh south to Benson. Many partners contribute to water chestnut control success in Vermont: The Nature Conservancy Vermont Chapter, U.S. Fish and Wildlife Service, Friends of Missisquoi Refuge and the Lake Champlain Basin Program among others. 

Control of Water Chestnut is Expensive!

Considerable taxpayer dollars are expended annually to control water chestnut in Lake Champlain and other Vermont waters. However leaving the problem untreated would lead to significant spread and result in losses to shoreline property values, decreases in recreational income from the lake and significant environmental impacts.  Funds for water chestnut management are appropriated from both federal and state sources.

Eurasian Watermilfoil Control

The majority of Eurasian watermilfoil management in Vermont is borne by local entities, who dedicate considerable resources annually to manage this species.  VTDEC provides technical assistance and manages Eurasian watermilfoil in some waterbodies where a local entity is not available. Permitted control methods in use include mechanical methods (mechanical harvesting, diver operated suction harvesting), physical methods (benthic mats) and chemical treatments. Active permits and those on notice for public comment can be found on our Aquatic Nuisance Control Public Notice website. Projects designed to manage or control Eurasian watermilfoil and other aquatic nuisance species are eligible for funding through DEC's Grant-in-Aid Program, and many towns use this grant opportunity to help fund watermilfoil management projects annually.

Variable-leaved Watermilfoil Control

Variable-leaved watermilfoil has been confirmed in two Vermont waterbodies: Halls Lake (Newbury) in 2008 and Lake Champlain (Missisquoi Bay in 2009 and South Bay (NY) in 2011). In Halls Lake, rapid response searches and removal of variable-leaved watermilfoil by hand harvesting reduced the population considerably.  Variable-leaved watermilfoil has not been found in the lake since June 2011.  VTDEC staff conduct annual searches of Halls Lake to ensure the population is controlled.

Resources for Aquatic Invasive Species Control

List of Aquatic Plant Contractors

2016 Vermont Water Chestnut Harvest Report

VTDEC Aquatic Nuisance Control Permitting

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