Blue-green algae bloom detected in Missisquoi Bay

Free Press Staff Report • July 18, 2009

Elevated levels of toxins detected in a blue-green algae bloom on the eastern shores of Missisquoi Bay in Lake Champlain has prompted the Vermont Department of Health to advise boaters, swimmers and residents to avoid contact and take precautions.

Exposing skin to some kinds of blue-green algae can result in irritation or allergic reactions, and drinking water containing algae that is producing toxins can cause nausea, vomiting and diarrhea. Anyone who has symptoms is advised to seek medical attention.

Algae have also been observed in Shelburne Bay, and traces were seen along the shoreline at Red Rocks Park in South Burlington.

The Health Department suggests the follow precautions:

• Avoid contact with algae-contaminated water.

• Do not swim or bathe in the water. Children are considered to be at higher risk because they are more likely to drink the water.

• Monitor water intakes for private residences. If you see algae present near the intake, switch to an alternate safe source of water.

• Do not use algae contaminated water to prepare meals or brush teeth. Boiling water will not remove toxins.

• Do not allow pets in algae-contaminated water.

No human cases of illness related to blue-green algae have been documented in Vermont since the Health Department and partner agencies including the University of Vermont Rubenstein School of Environment and Natural Resources started a surveillance and monitoring system in 1999.

Blooms can be reported by calling the Health Department at 800-439-8550. Homeowner toxin test kits can be purchased from the Health Department Laboratory at 800-660-9997.

The Health Department posts an online status map of algae blooms in Lake Champlain, including facts and photographs. The map is posted at: http://healthvermont.gov/enviro/bg_algae/bgalgae.aspx .