Blue-green algae blooms (known specifically as cyanobacteria or sometimes called “pond scum”) are large masses of a type of bacteria called cyanobacteria and occur naturally. They can be found in oceans and many freshwater lakes, bays and inlets. Harmful Algae Bloom (HAB) is another term to describe blue-green algae, since it can be harmful to people and pets. Know the facts to reduce your risk.
NOTE: Never boil the water, as it kills the algae resulting in the release of more toxins. If you feel unwell after encountering a HAB, seek medical attention.
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Blue-Green Algae (cyanobacteria) and their Toxins - Health Canada
Blue-green algae: Information for cottagers and home owners (PDF) - Ontario Ministry of the Environment
Blue-green algae - Province of Ontario
Guidelines for Canadian Drinking Water Quality - Cyanobacterial Toxins (PDF) - Health Canada