Blue-green algae is blooming as summer approaches
Posted May 19, 2025 12:42:11 PM.
Last Updated May 20, 2025 10:56:41 AM.
With rising temperatures and increasing rainfall, the province is reminding individuals to know the signs of blue-green algae.
Algae can appear like fine grass clippings in the water, spilled paint or a thick thick scum on the surface. Algae mats often look like clumps of vegetation and can appear brown, black or green in the water.
But not all blue-green algae is visible. Even if it is not detectable by sight, algae blooms can still cause illness.
The Department of Environment and Climate Change publishes a list of potential blue-green algae bloom sightings. Once a location is listed, it stays in place for the entire season. Reoccurrences of blue-green algae are common.
Halifax Regional Municipality also monitors and reports on the status of supervised beaches across the municipality between July 1 and August 31.
“Nova Scotia is known for our abundance of beautiful lakes, which are enjoyed for swimming, boating and walking along the shore,” Timothy Halman, Minister of Environment and Climate Change, said in a news release. “Climate change is causing more blue-green algae in our lakes and other freshwater bodies. As summer approaches, we are reminding Nova Scotians about the tools available to help them recognize and prevent exposure so they can enjoy our lakes and other freshwater safely.”
Exposure to blue-green algae when swimming can cause itchy and irritated skin and eyes. Inhalation or ingestion can cause headaches, fever, diarrhea, abdominal pain, nausea, vomiting, and in extreme cases, liver damage. Children are at greater risk due to their lower body weights and the likelihood of spending more time in the water. If you come into contact with blue-green algae, it is recommended that you wash your skin and clothing.
The province is also reminding Nova Scotians to take extra precautions to protect their pets. Pets are attracted to the smell of algae blooms, but ingestion can be fatal. Pets who come into contact with the algae should receive immediate veterinarian attention.
In 2024, the Nova Scotia NDP renewed calls to create a Provincial Lake Advisory Commission that would be responsible for the protection and conservation of healthy lakes and other bodies of water.
The commission has yet to be established.
