Cecil County, MD

ZIP 21921

In ZIP 21921, 7 of the 12 things we check have at least one part graded D or F.

• Drinking water: Stoney Chase/ Rock Creek M.h.p.s has 2 contaminants at or over an EPA legal limit; 4 contaminants are above health goals, led by pfoa at 914× California’s Public Health Goal.
• Nearest Superfund site: Ordnance Products, Inc., 2.6 miles away (3 within 10 miles).
• Largest share of modeled toxic air from industry: Croda Inc (56%), mostly ethylene oxide.
• Fine particles (PM2.5) average 6.8 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 89,478 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 21921

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

Based on 14 census tracts · compiled October 25, 2026 · how each grade works and its sources

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