Why is Lake Ontario not safe to swim?

Swimming conditions on Lake Ontario can be unpredictable and may have serious hazards, such as rip currents and high waves.



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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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For those of you wondering if it is safe to swim in Lake Ontario, Waterkeeper's answer is, Yes! It just depends where and when you want to swim.

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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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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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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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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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Lake Drownings are Especially Common It is easier to drown in freshwater than in saltwater. Lake waters are dark and murky – it harder to spot someone who is drowning. Ice on lakes can be thinner than expected, causing someone to fall through and drown.

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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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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 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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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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Lakes can be affected by pollution from various sources such as agricultural runoff, urban development, and recreational activities. High levels of bacteria, harmful algae blooms, and pollutants in the water can pose health risks to swimmers.

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