Are zebra mussels still a problem in the Great Lakes?
Zebra mussels are not native to the Great Lakes. They were first discovered in the area in the late 1980s, and it has been an ongoing battle to get rid of and control them ever since.
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Lake Michigan is generally clean and safe for swimming but it can become contaminated with harmful bacteria.
Significant progress has been made in reducing toxic chemicals in the Great Lakes, but some chemicals, such as PCBs, still pose a threat to human health and the environment. polycyclic aromatic hydrocarbons (PAHs), are higher in the waters of lakes Erie and Ontario than in other lakes.