Lake Conditions and Blue-green Algae Bloom Updates


Current Lake Conditions

Updated September 27, 2013

There were no reports of blooms on Lake Champlain or on the inland lakes in Vermont, and they are considered generally safe.

This is the last week of cyanobacteria monitoring for 2013. Thank you to all the volunteer monitors for your efforts each week, to the Lake Champlain Committee for training and supporting the volunteers, and to our partners at the Department of Environmental Conservation.

Shoreline residents and lake visitors should remember that algae blooms are still possible during the fall and spring. Be aware of changing conditions, and keep out of the water if you think blue-green algae may be present.

Watch for and avoid blooms - Wind and waves can move algae around. Blooms can appear or disappear very rapidly, so conditions around the lake are likely to change over the course of the week. As always, watch for and avoid blue-green algae blooms.

Not all bays, lakes, and ponds in Vermont are monitored.

Report a Bloom if you find a suspected algae bloom.

For the current status of your favorite beach or swimming area, contact whomever is responsible for maintaining the beach. This may be the town, Vermont State Parks, or a private association.

For conditions in New York lakes other than Lake Champlain, visit New York Blue-Green Algal Bloom Notices.

Lake Conditions Interactive Map

The map status of blue-green algae reflects conditions and data as of the date of report. Test site observations and samples are collected once each week.

Current lake conditions may change. If you see blue-green algae, don't go in the water.

The interactive Lake Champlain status map brings together in one place environmental and public health surveillance data about Blue-green algae. The map is a data collaboration project of the Departments of Health and Environmental Conservation.

For more information call 1-800-439-8550 or email Environmental Health Division.

Archive: 2012 Status Reports and Tracking Map

Find searchable data and information about the links between the environment and public health at our Vermont Environmental Public Health Tracking Portal.

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Alert Level Descriptions

Generally Safe - green
No toxic blue-green algae blooms were present along these shoreline areas when we sampled. These areas should be safe for recreational uses.

Low Alert - yellow
These shoreline areas have blue-green algae that produce toxins, but toxin concentrations are currently below levels of concern. These areas are open for recreation, but caution is advised in any areas where dense accumulations or scums are apparent.

High Alert - red
These shorelines have blue-green algae in dense scums at least in some areas, and toxin concentrations are above levels of concern. The water is not safe for recreational use in areas that contain scums. Please see Department of Health information about beach closings and hazardous areas.

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Report a Bloom

If you have questions or want to report a suspected bloom:
Call 800-439-8550 or 802-863-7220, or email

If you believe that someone has become ill because of exposure to blue-green algae, seek medical attention and contact the Health Department at 1-800-439-8550.

Updates and data are provided in cooperation with the Vermont Agency of Natural Resources and the Lake Champlain Committee.

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