Wurtsmith Air Force Base is a decommissioned United States Air Force base in Iosco County, Michigan. It operated from 1923 until decommissioned in 1993. On January 18, 1994 it was listed as a Superfund due to extensive groundwater contamination with heavy metals, polycyclic aromatic hydrocarbons, volatile organic compounds, including trichloroethylene, 1,1-dichloroethane, 1,1,1-trichloroethane, and vinyl chloride. In 2010, Per- and polyfluoroalkyl substances contamination was discovered, and as of 2022 remediation is still ongoing.