Frederick County, MD

ZIP 21788

In ZIP 21788, 6 of the 12 things we check have at least one part graded D or F.

• Drinking water: Highfield meets every EPA legal limit; 10 contaminants are above health goals, led by pfos at 2.7× California’s Public Health Goal.
• Nearest Superfund site: Fort Detrick Area B Ground Water, 3.8 miles away.
• Largest share of modeled toxic air from industry: Holcim(Us) Inc. (55%), mostly chromium.
• Fine particles (PM2.5) average 7.3 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 196,170 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 21788

• Superfund sites nearbyA to D
• Factories and industrial sitesA to C
• Oil and gas wellsA
• Parks and nature nearbyC to D
• Air qualityB to C
• Drinking water qualityB to F
• Pesticide useD to F
• Neighborhood health statusC to D
• Past wildfire impactsA
• Past flood impactsB
• Noise levelsA
• Radiation signalsC to D

Based on 8 census tracts · compiled September 10, 2026 · how each grade works and its sources

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