Merrimack County, NH

ZIP 03303

In ZIP 03303, 5 of the 12 things we check have at least one part graded D or F.

• Drinking water: Pillsbury Lake/Peninsula has 2 contaminants at or over an EPA legal limit; 2 contaminants are above health goals, led by arsenic at 7,085× California’s Public Health Goal.
• Closer to Superfund sites than 0% of U.S. neighborhoods, with no listed site within 10 miles of its center.
• Largest share of modeled toxic air from industry: Pitco Frialator Inc (84%), mostly chromium.
• Fine particles (PM2.5) average 5.8 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 12,119 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 03303

• Superfund sites nearbyA
• Factories and industrial sitesA to C
• Oil and gas wellsA
• Parks and nature nearbyB to D
• Air qualityA
• Drinking water qualityC to F
• Pesticide useC to D
• Neighborhood health statusB to D
• Past wildfire impactsA
• Past flood impactsB
• Noise levelsA to C
• Radiation signalsC to F

Based on 6 census tracts · compiled September 10, 2026 · how each grade works and its sources

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