Strafford County, NH

ZIP 03820

In ZIP 03820, 5 of the 12 things we check have at least one part graded D or F.

• Drinking water: Somersworth Water Works meets every EPA legal limit; 8 contaminants are above health goals, led by lead at 44× California’s Public Health Goal.
• Nearest Superfund site: Somersworth Sanitary Landfill, 0.1 miles away (3 within 10 miles).
• Largest share of modeled toxic air from industry: Pratt & Whitney (91%), mostly cobalt.
• Fine particles (PM2.5) average 5.3 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 4,299 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 03820

• Superfund sites nearbyF
• Factories and industrial sitesB to C
• Oil and gas wellsA
• Parks and nature nearbyC to D
• Air qualityA
• Drinking water qualityD to F
• Pesticide useB to D
• Neighborhood health statusB to C
• Past wildfire impactsA
• Past flood impactsC
• Noise levelsA to C
• Radiation signalsD

Based on 9 census tracts · compiled September 10, 2026 · how each grade works and its sources

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