Is Lake Ontario clean to drink?

Millions of people rely on the Great Lakes for their drinking water, which is considered safe if filtered properly. The city of Toronto treats over 1 billion litres of drinking water every day. That water is collected from Lake Ontario through intake pipes deep below the surface and at least 1 km from the shore.



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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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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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As the last lake in the chain, Ontario receives the accumulation of contaminants from the other Great Lakes in addition to the agricultural runoff, and urban and industrial waste discharges within its own basin.

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Sediment runoff such as clay or sand can also change the colour of the water to beige or light brown, especially after heavy rains.

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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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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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coli in the lake water originates from a variety of sources, with the primary sources being birds (especially geese and gulls at the beach), humans (faulty septic systems and sewage treatment plants along the shoreline), urban runoff (storm sewers and road discharges to the lake), and agriculture (manure spills and ...

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Smelly or Discolored Water The smell or appearance of water can also indicate water pollution. Water contaminated with sulfur or certain bacteria will emit the smell of rotten eggs. High iron levels give water an orange color. High manganese levels will cause water to look purple or black.

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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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Spending time in natural bodies of water—like oceans, lakes, and rivers—is a great way to enjoy the outdoors with family and friends. While this can help you stay active, it is important to know that the water we swim, play, wade, and relax in can also spread germs and make you, and those you care about, sick.

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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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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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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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