The A. H. Nilson Machine Company site remains an active threat under National Priorities List status. The EPA ID 110009334666 tracks unspecified hazardous substances that require ongoing monitoring and remediation. Exposure pathways in Ansonia include the inhalation of contaminated dust, ingestion of groundwater, and direct contact with polluted soil from 12 nearby sites within a five-mile radius. High concentrations of industrial pollutants increase long-term risks for respiratory illnesses, neurological damage, and certain cancers. Cleanup efforts at sites like the Ansonia Brass Mill and O’Sullivan’s Island are in various stages of assessment or emergency response. Residents must take specific defensive measures to mitigate these risks. First, use high-efficiency particulate air (HEPA) filters in home ventilation systems to capture airborne contaminants. Second, conduct professional soil testing before starting any backyard gardens to ensure no heavy metals are present. Third, utilize a certified water filtration system that meets NSF/ANSI standards for chemical reduction if relying on local ground sources. Monitoring federal updates on the Pandel Properties and Liberty Street sites is essential for understanding shifting plume dynamics. These actions provide a necessary layer of protection against the documented high-density industrial contamination found throughout the Ansonia corridor.