EPA Superfund site
SHIAWASSEE RIVER
Human exposure is NOT currently under control
Data limitations: Proximity to a Superfund site boundary does not mean your property is contaminated. EPA site boundaries show the area designated for cleanup, not the full extent of contamination. Groundwater plumes can extend beyond site boundaries. This tool shows publicly available EPA federal data. It is not affiliated with or endorsed by EPA, and is not a substitute for a professional environmental assessment.
About this site's exposure pathways
As of May 2026, the Shiawassee River site is considered "Current Human Exposure Not Under Control" (HENC) because new contaminants were identified in soil, groundwater, soil vapor, and indoor air. From September 2021 through February 2024, a preliminary vapor intrusion (VI) and groundwater investigation were conducted at the Site. Chlorinated volatile organic compounds (VOCs) were identified above criteria on-Site groundwater and sub-slab soil gas and chlorinated VOCs were detected in indoor air, indicating a complete VI pathway. Further, Per- and polyfluoroalkyl substances (PFAS) were identified in on-Site groundwater above the EPA Regional Screening Levels (RSLs). VOCs and PFAS were not identified as contaminants of concern regarding the 2001 Record of Decision. Beginning in June 2026, a remedial investigation/feasibility study (RI/FS) will evaluate the nature and extent of VOC and PFAS contamination. The RI/FS will be completed by December 2028, followed by a Record of Decision selecting a new remedy. Sufficient information to make human health exposure is by December 2028. It is estimated that human exposure will be under control by July 2030.