Understanding Blue-Green Algae: Identification and Risks

Blue-green algae, also known as cyanobacteria, are microscopic, plant-like organisms that occur naturally in ponds, rivers, lakes, and streams. They can appear in various colors, including blue-green, olive-green, or red. The presence of blue-green algae can be identified by observing water that appears discolored or has foam, scum, or mats on the surface. Residents are advised to avoid swimming or playing in areas where these conditions are present, as some blue-green algae can produce toxins harmful to humans and pets.

The Durham Region Health Department has reported the presence of blue-green algae in Lake Scugog, specifically near Platten Island. While there is currently no evidence of blue-green algae at Kinsmen Beach (Palmer Park, Port Perry), advisory signs will be posted as a precaution due to the history of blue-green algae in that area.

To protect themselves and their pets, individuals should refrain from entering the water in areas where blue-green algae is suspected. Children and pets should not play in or drink water from areas with posted beach advisories. Additionally, consuming fish from waters where algae mats are present or where swimming advisories are in effect is not recommended.

The Health Department monitors 14 public beaches throughout Durham Region from early June until the end of August, posting information notices about blue-green algae during the monitoring season. It is important to note that the monitoring program does not cover all accessible lake waters or privately owned waterfront properties, where blue-green algae may also be present. Residents are encouraged to exercise caution in these areas.