Hillsborough, NH

ZIP 03051

In ZIP 03051, 5 of the 12 things we check have at least one part graded D or F.

• Drinking water: Pennichuck Water Works meets every EPA legal limit; 7 contaminants are above health goals, led by bromodichloromethane at 132× California’s Public Health Goal.
• Nearest Superfund site: Mohawk Tannery, 4.1 miles away (3 within 10 miles).
• Largest share of modeled toxic air from industry: Proto Labs Inc (22%), mostly chromium.
• Fine particles (PM2.5) average 6.7 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 24,072 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 03051

• Superfund sites nearbyD to F
• Factories and industrial sitesC to D
• Oil and gas wellsA
• Parks and nature nearbyC
• Air qualityA to B
• Drinking water qualityC to F
• Pesticide useB to D
• Neighborhood health statusB to C
• Past wildfire impactsA
• Past flood impactsC
• Noise levelsA
• Radiation signalsF

Based on 6 census tracts · compiled October 25, 2026 · how each grade works and its sources

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