Rockingham County, NH

ZIP 03874

In ZIP 03874, 6 of the 12 things we check have at least one part graded D or F.

• Drinking water: Seabrook Water Dept has 2 contaminants at or over an EPA legal limit; 17 contaminants are above health goals, led by pfos at 5.3× California’s Public Health Goal.
• Nearest Superfund site: Microfab Inc (former), 6.5 miles away (2 within 10 miles).
• Largest share of modeled toxic air from industry: Union Specialties Inc (82%), mostly hydrazine.
• Fine particles (PM2.5) average 5.5 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 18,148 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 03874

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

Based on 4 census tracts · compiled September 10, 2026 · how each grade works and its sources

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