Blue-green algae bloom confirmed in Wagner Lake - Tributaries north of Wagner Lake in Uxbridge and Brock townships also affected

Whitby, Ontario– Durham Region Health Department was notified by the Ontario Ministry of the Environment, Conservation and Parks (MECP) of the visual presence of a blue-green algae bloom in Wagner Lake, Uxbridge. As of Oct. 22, the blue-green algal bloom in Wagner Lake had dissipated. However, water samples collected by the MECP from an isolated pocket of algae in the north end of the lake was confirmed to be a blue-green algae bloom.

Additional reports of a confirmed blue-green algal bloom in tributary waters north of Wagner Lake were also reported to the Health Department. The bloom was last reported as entering Lake Simcoe at the mouth of the Pefferlaw River. It is possible that blue-green algal blooms will be observed elsewhere in streams and lakes at this time of year.

Blue-green algae are microscopic, plant-like organisms that occur naturally in ponds, rivers, lakes and streams, and although often blue-green in color, the algae can also be olive-green or red. The public are advised to be cautious around blue-green algae as some blooms can produce toxins which may be harmful to humans.

Residents who draw water from near-shore wells or directly from affected water bodies are advised not to drink the water for the duration of the bloom and for two weeks after the bloom dissipates, as home water treatment systems may not be able to remove toxins. An alternate source of potable drinking water is recommended. People and pets should not swim or play in areas where water appears discolored or where foam, scum or mats of algae are present on the water’s surface. Consuming fish from affected areas is also not advisable.

To report blue-green algae call the Spills Action Centre at 1-800-268-6060 or TTY 1-855-889-5775. For more information about blue-green algae, visit durham.ca/beaches or call the Environmental Help Line at 905-723-3818 or 1-888-777-9613.

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For more information, please contact Health Department.