The Minnesota Department of Public Health (MDH) and Pollution Control Agency (MPCA) work together to investigate and mitigate the presence of PFAS in drinking water in both private wells and sources of supply for municipal systems throughout the state.

  • Minnesota first discovered PFAS in source of drinking water in 2002 near the Twin Cities that had been released into groundwater from manufacturing and waste disposal sites.
  • Over 150 square miles of groundwater contamination affecting the drinking water supplies of over 140,000 Minnesotans have been identified.
  • Homes that rely on contaminated wells are routinely either connected to municipal water systems or provided with granular activated carbon filters that are maintained by the state.
  • MDH has established health-based values for several PFAS 



  • Since 2002, MDH and MPCA have sampled over 2,800 private wells and issued drinking water advisories for nearly 1,050 where PFAS was detected in levels exceeding statewide health-based criteria.
  • Testing between 2008 and 2018 found that  PFAS levels in the bodies of participants were higher than average for the general U.S. population, declined following the installation of treatment systems.
  • An interactive map that contains information about sources of PFAS contamination, sampling results, and priority sampling area boundaries and a regularly-updated timeline that summarizes annual progress going back to 2002 is available online