News release

Warm Temperatures May Cause Algae Blooms

Environment (April 2008 - Feb. 2021)
Health and Wellness

As temperatures rise across the province, Nova Scotians should keep an eye out for blue-green algae blooms in lakes and rivers.

"In the right conditions, algae blooms can naturally form on any lake or river in the province and the public should avoid contact with the bloom and the water, until it has dissipated," said medical officer of health, Dr. Richard Gould. "While the risk to health is fairly low, if you come in contact with a bloom and develop symptoms that persist for a few days, you should consult a physician."

Also known as pond scum, it can be spotted by its blueish green, grassy or soupy appearance, and sometimes it gives off a distinct odour. Many types of blue-green algae are harmless, but some can produce toxins that pose a health risk to people and animals.

People should not swim in, drink from, or eat fish from water sources where blue-green algae is present. Water contaminated by the algae should not be used to prepare or cook food, and boiling the water will not eliminate the toxins.

If water containing the algae is swallowed, symptoms may include stomach ache, diarrhea, vomiting and nausea. Direct contact with skin from swimming may cause skin, nose, throat or eye irritations.

Nova Scotians who suspect an algae bloom can call and report it to their local Department of Environment office.

For more information, visit the departments of Environment and Health and Wellness websites at www.novascotia.ca/nse/water/docs/BlueGreenAlgae.pdf and www.novascotia.ca/hpp/environmental/ .