News release

Conditions Ripe for Blue-green Algae

Environment (April 2008 - Feb. 2021)

A mild winter, little snow and a dry start to spring means the conditions are right for early blooms of blue-green algae in Nova Scotia's lakes and rivers.

Also known as pond scum, the algae can be spotted by its blueish green, grassy or soupy appearance and its sometimes distinct odour. It can naturally form on any lake or river under the right conditions. Many types of blue-green algae are harmless, but some can produce toxins that pose a health risk to people and animals.

While the risk to human health is fairly low, 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. If symptoms persist, consult a health-care provider.

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

More information is available on our website at www.novascotia.ca/nse/water/docs/BlueGreenAlgae.pdf and http://novascotia.ca/dhw/environmental/blue-green-algae.asp.