Can you swim on 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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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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In September 1954, 16-year-old Marilyn Bell became the first person to swim across Lake Ontario. Originally, the Lake Ontario swim had been planned by the Canadian National Exhibition (CNE) as a publicity event that offered American marathon swimmer Florence Chadwick $10,000 to cross the 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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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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Today, Lake Ontario is home - and a source of drinking water - to 9-million people living in Ontario, Canada and New York State, USA.

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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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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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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 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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Lake Ontario is one of the five Great Lakes of North America. It is bounded on the north, west, and southwest by the Canadian province of Ontario, and on the south and east by the U.S. state of New York. The Canada–United States border spans the centre of the lake.



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Glacial-fed alpine lakes in the Rocky Mountains are among the clearest in the world. Fine rock dust, produced by massive glaciers rubbing against bedrock, stays suspended in the water, reflecting light and creating the turquoise colours that Moraine Lake and Lake Louise are known for.

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