The Barkhamsted-New Hartford Landfill is an active Superfund site under EPA ID 110044324978. It was placed on the National Priorities List due to the presence of unspecified hazardous substances that threaten local ecosystems. Contaminants primarily migrate through groundwater and soil vapor intrusion. Exposure pathways include the ingestion of contaminated well water and the inhalation of volatile organic compounds that may enter residential basements. Prolonged exposure to these substances is linked to increased risks of organ damage, developmental issues, and certain cancers. While the EPA monitors the site, residents should remain vigilant about local environmental quality. To defend against these risks, first, residents using private wells should conduct annual laboratory testing for heavy metals and volatile organic compounds. Second, install high-quality carbon filtration systems on all drinking water taps to reduce chemical intake. Third, ensure proper basement ventilation or install vapor barriers to prevent toxic gases from accumulating indoors. These steps are necessary because the site remains active and poses a persistent threat to the surrounding five-mile radius, which includes Collinsville.