Worcester County, MA

ZIP 01503

In ZIP 01503, 5 of the 12 things we check have at least one part graded D or F.

• Drinking water: Marlborough Dpw Water Div. (Mwra) has 1 contaminant at or over an EPA legal limit; 9 contaminants are above health goals, led by lead at 84× California’s Public Health Goal.
• Nearest Superfund site: Hocomonco Pond, 7.4 miles away (3 within 10 miles).
• Largest share of modeled toxic air from industry: Isomedix Operations Inc. (77%), mostly ethylene oxide.
• Fine particles (PM2.5) average 6.0 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 90,069 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 01503

• Superfund sites nearbyD
• Factories and industrial sitesC
• Oil and gas wellsA
• Parks and nature nearbyB
• Air qualityA
• Drinking water qualityB to F
• Pesticide useD
• Neighborhood health statusD
• 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

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