What are PFAS?

Perfluoroalkyl and polyfluoroalkyl substances (PFAS), such as perfluorooctanoic acid (PFOA) and perfluorooctanesulfonic acid (PFOS), are part of a group of chemicals used globally during the past century in manufacturing, firefighting and thousands of common household and other consumer products. These chemicals can be present in personal care products such as cosmetics and lotions, some insect repellants and sunscreens, and even in pizza boxes and fast food wrappers.

In recent years, experts have become increasingly concerned by the potential effects of high concentrations of PFAS on human health. Learn more about PFAS at

Drinking Water Testing

The State of Michigan is working proactively to identify locations where PFAS may be present as a contaminant. The Michigan Department of Environmental Quality tested all of the public systems in Michigan in 2018.

Well Water

If you’re concerned about your well water, our Environmental Health staff can provide personalized information and guidance. Give them a call at 734-222-3800.

To find information about your well, including your well log, which is a detailed construction record for your well, please read our Instructions for Finding Your Well Log.

If you want to test your water, information is available on our page How to Test Drinking Water for PFAS

PFAS and Health

Scientists are still learning about the health effects of exposures to mixtures of PFAS. Although more research is needed, some studies in people have shown that certain PFAS may:

  • affect growth, learning, and behavior of infants and older children
  • lower a woman’s chance of getting pregnant
  • interfere with the body’s natural hormones
  • increase cholesterol levels
  • affect the immune system
  • increase the risk of certain types of cancer

More information about PFAS and health is available from the State of Michigan and the CDC.

Additional Information

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