Lake Superior stretches between the upper Midwest and Canada, touching Michigan, Minnesota, Wisconsin, and Ontario. The lake features oxygen-rich water, low mineral content, nearly undetectable algae-friendly phosphorus levels, and crystal-clear visibility, earning a pollution score of 0 out of 10. Washington's Lake Chelan and Lake Hartwell (straddling Georgia and South Carolina) ranked as the next-cleanest with low pollution scores of 0.14 and 1.73 respectively. Florida's Lake Okeechobee scored 10 with visibly murky water and lead contamination. American Falls Reservoir showed ammonia presence despite clear appearance, and Lake Texoma ranked among the dirtiest.
"We are pleased to find that, generally speaking, large lakes remain very clean and safe to swim in, though monitoring any signage near swimming spots and adhering to the indicated advice may save you from catching a rare but nasty stomach bug," David Ciccarelli, the CEO of Lake.com, said in a statement, adding "larger lakes seem to have three times less sulfates and nearly four times less [totality of minerals within the water]."
The honor belongs to Lake Superior, which stretches between the upper Midwest and Canada, touching Michigan, Minnesota, Wisconsin, and the province of Ontario, according to a study vacation rental platform Lake.com. The Great Lake was lauded for its oxygen-rich water and low mineral content. According to the study, the large lake boasted nearly undetectable algae-friendly phosphorus levels and "second-to-none crystal-clear water." In fact, Lake Superior was so clean, it received an overall pollution score of 0 out of 10.
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