Is it safe to swim in Lake Ontario?

Yes! Lake Ontario offers fantastic swimming at many beaches. Not all beaches are 'public beaches', some are naturally occurring 'wild beaches' along Lake Ontario's shoreline. Local Health Units often test water quality at public beaches and lifeguards may supervise swimmers in designated swimming areas.



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Along with Lake Erie, Lake Ontario is the most polluted of the Great Lakes. This contributes to potential health risks associated with bathing in its waters, an issue that the other three Great Lakes do not add to the mix.

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The opposite of Lake Superior in almost every way, Lake Ontario is the easternmost, lowest in elevation, smallest in surface area and perhaps the most polluted Great Lake.

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Lake Ontario continues to be a good source of high-quality drinking water. Toxic chemicals monitored in Lake Ontario are assessed as Fair and long-term trends indicate that concentrations are declining, including declines in contaminant concentrations in fish filets.

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Stay out of the water if Cloudy water can be a warning that there are more germs in the water than normal. Discolored or smelly water could mean there is a harmful algal bloom (HAB) in the water.

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The State of the Great Lakes 2022 Report by the Michigan Department of Environment, Great Lakes and Energy have analyzed and reported that Lake Superior and Lake Huron are rated as “good” ecosystems as Lake Michigan and Lake Ontario are rated “fair” and Lake Erie was ranked as “poor.”

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Little Cove, Tobermory Located in Little Cove Provincial Park, the rugged Lake Huron shoreline provides some of the clearest water in Ontario.

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The reason Lake Ontario stays cold is because it's so deep. The temperature of the lake changes at different depths, which is due to changes in the density of the water. This is called thermal stratification.

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If there is scum or algae visible in the water, it won't be clean enough to swim in. There are also natural hazards to outdoor waters compared with pools, especially in the summer. Blue-green algae is a type of bacteria naturally found in lake ecosystems.

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The rougher the Lake is, the more likely you are to get sick, and the much quicker it will occur. After all, you are less likely to get sick on a flat body of water or calm seas! Finding out whether you are prone to sea sickess or not, as well as to what degree, comes with experience.

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Dry yourself off with a towel as soon as you come out of the water. If possible, have a shower and dry off right away. However, showering will not remove any larvae that have already burrowed under your skin.

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Randle Reef is now considered the largest contaminated site on the Canadian side of the Great Lakes and the second-most contaminated site in Canada after the Sydney Tar Ponds in Nova Scotia. The volume of contaminated sediment in the Hamilton Harbour could fill up three hockey arenas.

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Italy's Lugano and Maggiore were the most polluted in an international survey of 38 lakes.

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The opposite of Lake Superior in almost every way, Lake Ontario is the easternmost, lowest in elevation, smallest in surface area and perhaps the most polluted Great Lake.

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1. Peyto Lake. Starting our list of the clearest lakes in Canada is Peyto Lake.

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The Great Lakes are not (noticeably) salty because water flows into them as well as out of them, carrying away the low concentrations of minerals in the water, writes Michael Moore of Toronto. Eventually, this water, with its small load of dissolved minerals or salts, reaches the sea.

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Fast-moving currents, waves and rapids, even in shallow water. Hazards, such as dams, underwater obstacles, or rocks and debris. Vegetation, animals and fish. Drop-offs that can unexpectedly change water depth.

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