Middlesex County, MA

ZIP 01720

In ZIP 01720, 6 of the 12 things we check have at least one part graded D or F.

• Drinking water: Sudbury Water District has 1 contaminant at or over an EPA legal limit; 15 contaminants are above health goals, led by arsenic at 338× California’s Public Health Goal.
• Nearest Superfund site: W.r. Grace & Co., Inc. (acton Plant), 2.5 miles away (3 within 10 miles).
• Largest share of modeled toxic air from industry: Tecomet (23%), mostly chromium.
• Fine particles (PM2.5) average 6.2 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 34,462 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 01720

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

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

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