Per- and polyfluoroalkyl substances (PFAS) are a group of nearly 5,000 different synthetic chemicals that are used widely in products and industrial processes. A few of the most studied PFAS are known to be hazardous to human health. Since PFAS contamination was detected in drinking water in the eastern Twin Cities in the early 2000s, the chemicals have been found in water, sediment, soil, and fish all across Minnesota.

The MPCA tested for PFAS in groundwater at 101 of the 111 sites in the Closed Landfill Program:

  • PFAS were detected at 98 landfills.
  • At 59 landfills, PFAS levels exceeded Minnesota Department of Health drinking water guidance values.

Closed landfill sites with PFAS detections

97% of assessed closed landfills have PFAS contamination.

Map: 97% of assessed closed landfills have PFAS contamination
The map shows closed landfill sites around Minnesota and the level of PFAS found at each site labeled. PFAS was detected at 98 of the landfills. At 59 of the landfills PFAS levels exceeded health standards and PFAS levels were 10 times above health standards at 15 landfills.