Sandown, New Hampshire, encompassing ZIP code 03873, currently holds a critical environmental hazard designation due to its direct proximity to a dense cluster of federal remediation areas. The municipality sits within ten miles of nine hazardous sites, with the nearest being the Mottolo Pig Farm, located 4.6 miles away. Other notable active sites within six miles include Ottati and Goss Kingston Steel Drum and Beede Waste Oil. The Mottolo Pig Farm remains on the Environmental Protection Agency National Priorities List with an active status, indicating that extensive remedial cleanup efforts, groundwater treatment, and environmental monitoring are currently underway. The primary pollutants associated with this federal site are classified as unspecified hazardous substances. These typically encompass volatile organic compounds, industrial solvents, and heavy metals. When these chemicals migrate into local groundwater or soil, they pose severe public health threats. Chronic exposure to these contaminants can cause neurological impairment, respiratory distress, organ damage, and elevated cancer risks among the local populations.

Because local aquifers remain highly vulnerable during ongoing federal cleanup phases, residents must take immediate protective action. First, households relying on private well water should commission biannual testing for volatile organic compounds and heavy metals through state certified independent commercial laboratories. Second, residents should install certified activated carbon or reverse osmosis point of use water filtration systems to proactively block potential drinking water exposure. Third, property owners should inspect basement foundations for structural cracks and permanently seal them immediately to prevent toxic vapor intrusion from contaminated subsurface soil gas migrating into residential living spaces.