Strafford County, NH

ZIP 03861

In ZIP 03861, 3 of the 12 things we check have at least one part graded D or F.

• Drinking water: Portsmouth Water Works has 2 contaminants at or over an EPA legal limit; 12 contaminants are above health goals, led by lead at 52× California’s Public Health Goal.
• Nearest Superfund site: Dover Municipal Landfill, 4.6 miles away (3 within 10 miles).
• Largest share of modeled toxic air from industry: Pratt & Whitney (74%), mostly cobalt.
• Fine particles (PM2.5) average 5.4 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 03861

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

Based on 1 census tract · compiled September 10, 2026 · how each grade works and its sources

Loading the full report, with every source…