Fifteen percent of the monitored beaches in Michigan were closed or had health advisories due to E. coli bacteria from fecal contamination, Tina Lam at the Detroit Free Press reports, and since only 40 percent portion of the states beaches are even tested for E. coli, it’s unknown how much contamination exists at some of the state’s most popular beaches.
This information comes from the annual beach report by the Natural Resources Defense Council. This years report found that beaches in the Great Lakes were dirty twice as often as beaches in other parts of the country.
Sewage overflows are a major source of E. coli contamination at beaches, the report states, and this problem is likely to get worse as climate change leads to more intense rains.
Information about current Michigan beach closings is available here.