Mattapan, Massachusetts, within the 02126 zip code, currently carries a critical environmental hazard designation due to significant regional industrial contamination. The geographic area contains 14 hazardous waste sites within five miles and 41 sites within a ten-mile radius. The most prominent nearby Superfund location is the Allis & Chalmers Electrical Manufacturing Facility (Former), situated 3.5 miles from the center of Mattapan. This location maintains an active National Priorities List status, indicating that the Environmental Protection Agency continues to oversee mandatory long-term cleanup and containment efforts. Additional active hazards proximate to Mattapan include the Dudley Street Lead/Arsenic site and the Riverside Square PCB location. While the primary contaminants at the Allis & Chalmers Electrical Manufacturing Facility (Former) are listed as unspecified hazardous substances, surrounding sites contain confirmed heavy metals and polychlorinated biphenyls. These industrial chemicals readily migrate through local soil and groundwater. Chronic exposure to these legacy pollutants poses severe public health risks, including cumulative neurological damage, respiratory distress, and elevated rates of specific cancers. Given the active regulatory status of these multiple facilities, residents should implement immediate preventive measures. Households should install high-efficiency particulate air filters and NSF-certified drinking water filtration systems proven to remove heavy metals and volatile organic compounds. Residents engaging in urban agriculture should strictly utilize raised garden beds filled with tested, commercial topsoil to avoid contact with native contaminated earth. Finally, individuals should consistently remove footwear prior to entering homes to prevent tracking hazardous particulate matter and contaminated dust into interior living spaces.