Pathogens wash off the land from wild animal, farm animal and pet waste, and can also enter the lake from improperly functioning septic systems, leaky sewer lines and boat sanitary disposal systems.
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The blue in Lake Michigan and Lake Huron is sediment brought to the surface when strong winds churned the lakes. The green in Lake Erie and in Lake Huron's Saginaw Bay is algae, which builds on the surface when winds are calm.
Chemical contamination, non-native invasive species, habitat loss, poor coastal health, and aquatic food web changes are the greatest threats to the Lake Huron ecosystem. Fathom Five National Park, Canada. Photo: Environment Canada.
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.
Of all of the Great Lakes, Lake Erie had become predominantly polluted by the 1960s, largely due to the heavy industrial presence along its shores. With 11.6 million people living in its basin, and with big cities and sprawling farmland dominating its watershed, Lake Erie is severely impacted by human activities.
1. Lake Huron. Lake Huron is a large lake that is connected to Lake Michigan. This Great Lake is known for having less algae-laden water than many other Michigan lakes, along with numerous clean beaches.
With the longest shoreline of all of the Great Lakes, Lake Huron is one of the most unique lakes on Earth. It is the second largest of the Great Lakes, and the fourth largest lake in the world by surface area. Huron is renowned for its beaches, sand dunes, wetlands, forests, and extensive river systems.
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.