Which Great Lake has the most pollution?

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 Erie is the fourth-largest lake in North America (by surface area) and the eleventh-largest worldwide. It is the Great Lakes' southernmost, shallowest, and smallest by volume. By the 1960s, Lake Erie had become the most polluted of the Great Lakes, owing to the substantial industrial presence along its coasts.

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Watershed's surface: 209,000 square kms. Lake Superior is the largest, cleanest, and wildest of all the Great Lakes.

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Unfortunately, the Great Lakes suffer from pollution, like many other water bodies around the world.

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Sources of pollution include:
  • runoff of soils and farm chemicals from agricultural lands.
  • waste from cities.
  • discharges from industrial areas.
  • leachate from disposal sites.
  • direct atmospheric pollutants that fall as rain, snow, or dust on the lake surface, or exchange as gases with the lake water.


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Lake Michigan is generally clean and safe for swimming but it can become contaminated with harmful bacteria.

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Currents in Lake Erie can be dangerous! Any current flowing faster than 2 mph is considered dangerous. Dangerous currents can exceed 5 mph — faster than an Olympic swimmer can swim.

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Lake Erie and Lake Michigan are ranked the third and fourth most polluted lakes in the United States, according to nature website AZ Animals.

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During the 1960s, Lake Erie was declared a “dead lake” due to eutrophication and pollution. The children's book, The Lorax, written by Dr. Seuss, actually included the following line referring to fish: “They will walk on their fins and get woefully weary in search of some water that isn't so smeary.

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Lake Superior is the world's largest freshwater lake by area (31,700 mi2 /82,100 km2). It is also the coldest and deepest of the Great Lakes, with a maximum depth of 406 meters (1,332 feet). By most measures, it is the healthiest of all the Great Lakes.

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Lake Erie is the shallowest and warmest of the Great Lakes.

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Lake Superior is safe for swimming. In fact, it has the lowest drowning rate of all the Great Lakes, as reflected in the statistics provided by the Great Lakes Surf Rescue Project. There were 108 confirmed drownings in the Great Lakes in 2022, along with 12 unknown final outcomes.

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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 highest median levels were found in Lake Michigan and Lake Ontario. Though myriad microplastic sources exist, wastewater treatment plants seem to be a major Great Lakes basin contributor, as they are elsewhere, Hataley said.

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The highest median levels were found in Lake Michigan and Lake Ontario. Though myriad microplastic sources exist, wastewater treatment plants seem to be a major Great Lakes basin contributor, as they are elsewhere, Hataley said.

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The good news is that because Lake Erie is so shallow and turns over every 2.6 years, that it can get healthy pretty fast if the problem sources are reduced/eliminated.

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It has been marked as good for ecosystems, suggesting that it is relatively healthy. Lake Huron is also known for its clear waters. The lack of significant amounts of algae blooms or pollution sources contributes to water clarity. Additionally, its location in the Great Lakes system contributes to its water quality.

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Lake Erie provides drinking water for more people than any other, but algae blooms are making it toxic. Every year, an explosion of microscopic life reigns over western Lake Erie, forming a green slick of algae and bacteria so massive and vibrant that it can be seen from space.

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The first recorded swimmer to cross Lake Erie was Pennsylvania teenager Pat Budney in 1975. He swam from Long Point to Presque Isle in Pennsylvania, a distance of 26 miles that took him 26 ½ hours. The state park beach where he finished now bears his name.

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Lake Erie is the second smallest Great Lake by surface area, and the smallest by volume. Because of this, the water of Lake Erie also has the shortest residence time. Water in this lake replaces itself every 2.6 years, as opposed to Lake Superior, which takes two centuries.

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Lake Erie has an astonishing 2,000-plus shipwrecks which is among the highest concentration of shipwrecks in the world. Only about 400 of Lake Erie's wrecks have ever been found. There are schooners, freighters, steamships, tugs and fishing boats among them.

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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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These lakes are the perfect backdrop for swimming, boating, and other water-related activities. But there can be more danger in these Great Lakes waves than what you'd find in the ocean. The Great Lakes are more than capable of generating waves over 10 feet high, despite being smaller than our oceans.

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