The Belleville Area Office of the Ministry of the Environment, Conservation and Parks (MECP) attended this site on August 31, 2023 in response to a notification regarding a possible blue green algal bloom in Jordan Lake, in the Township of Tudor and Cashel.

Final Laboratory results for both locations are indicative of blue-green algal blooms (specifically Phormidium, Dolichospermum, and Spirulina at Location 1 and Phormidium, Planktothrix, and Spirulina at Location 2) and mats of green algae at both locations (specifically Mougeotia).

The samples from Location 1 and 2 had Total Microcystin concentrations of 0.37 μg/L and 0.21 μg/L, respectively. Anatoxin-A and Microcystin-LR for both locations were below the laboratories reported detection limit.

Health Canada’s Recreational Limit for Microcystin is 10 μg/L, and Ontario’s Drinking Water Standard is 1.5 μg/L.

These results are based on the amount of algal material in the submitted samples. Algal blooms have the potential to change over time if conditions are favourable for growth.

If you use water from the lake for household purposes please contact the Health Unit for further information 613-966-5500 ext 677

Health related questions should be directed to local Public Health or a Physician.

Avoid swimming in areas of the lake where blooms are visible by both yourself and pets.

For general information on blue-green algae, please refer to the Ministry of the Environment, Conservation and Parks’ website at Blue-green algae | ontario.ca or the fact sheet attached.

Fact Sheet – Information About Blue Green Algae – English – High Resolution Version