The Durham Region Health Department has issued a Blue-Green Algae Advisory for the eastern shore of Lake Scugog near William’s Point Road in Caesarea.
The advisory follows test results from a water sample collected on July 9 by the Ontario Ministry of the Environment, Conservation and Parks, which confirmed the presence of blue-green algae in the area.
Blue-green algae, also known as cyanobacteria, are microscopic organisms that occur naturally in lakes, rivers, ponds, and streams. During summer months, changing weather conditions can increase the likelihood of algae blooms. These blooms can form quickly and may produce toxins that pose health risks to both humans and animals.
Residents and visitors are advised to avoid contact with water that appears discoloured or contains visible algae mats, which may be blue-green, olive-green, or red in colour. The Health Department warns that some types of blue-green algae can release toxins harmful to skin, eyes, and internal organs if ingested.
Those who draw water from near-shore wells or directly from the lake are advised not to drink the water while the bloom is present and for two weeks after it clears, as typical home treatment systems may not remove the toxins. Boiling the water will not destroy these toxins. An alternate source of potable water is recommended.
The Health Department issued the following safety reminders:
- Do not swim, wade, or play in water where algae are visible.
- Do not drink untreated lake water under any circumstances.
- Keep children and pets away from affected areas.
- Avoid consuming fish caught in areas with visible algae or where an advisory has been issued.
Foam, scum, or mats on the water’s surface are common indicators of a bloom. Anyone who spots suspected algae is encouraged to report it by calling the Spills Action Centre at 1-800-268-6060 or TTY 1-855-889-5775.
For more information on blue-green algae and beach water quality in Durham Region, visit durham.ca/Beaches or contact the Durham Health Connection Line at 905-668-2020 or 1-800-841-2729.