Lake Champlain

Rules Determining Mean Water Levels

30 December 2011
"Mean water level" for purposes of 29 V.S.A. §401 and "normal mean water level" for purposes of 10 V.S.A. §1422(8) shall be referenced to National Geodetic Vertical Datum of 1929 (NGVD 29), and shall be determined according to these rules.

What are Cyanobacteria?

Magnified cyanobacteria

Cyanobacteria are photosynthesizing bacteria that may produce cyanotoxins that can cause illness to exposed human and animal populations.   A bloom is a visually identified concentration of cyanobacteria that discolors the water.  Cyanobacterial cells may be found at the water surface, at a defined depth, or present throughout the water column. 

Cyanotoxin Monitoring Program

Summer 2021, marks the seventh year DWGWPD is collaborating with the Vermont Department of Health (VDH), to offer at no cost cyanotoxin analysis of raw and finished water at the VDH laboratory for the 22 Lake Champlain-sourced public water systems for 12 weeks (July through September).

Special Studies


vernal pool in winter and summer

The Watershed Management Division participates in “special studies” when the need arises, such as: 

Zebra Mussel Monitoring Program

Lake Champlain Basin Program logoLake Champlain Zebra Mussel Monitoring Program

The Vermont Department of Environmental Conservation (VTDEC), in cooperation with the Lake Champlain Basin Program, initiated the Lake Champlain Zebra Mussel Monitoring Program in 1994 to track the zebra mussel's distribution through the lake. Reports are provided annually.

Lake Champlain Long-term Monitoring Project

several sailboats moored on lake champlain

The Lake Champlain Long-Term Water Quality and Biological Monitoring Project (LTMP) is designed to measure overall ecosystem health of Lake Champlain based on key ecosystem indicators and to assess long-term effects of management actions and other environmental changes.

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