Charles County, MD

ZIP 20645

In ZIP 20645, 4 of the 12 things we check have at least one part graded D or F.

• Drinking water: Thunderbird Motel has 1 contaminant at or over an EPA legal limit; 4 contaminants are above health goals, led by arsenic at 883× California’s Public Health Goal.
• Nearest Superfund site: Naval Surface Warfare Center - Dahlgren, 7.1 miles away.
• Largest share of modeled toxic air from industry: Stella-Jones Corp (36%), mostly sulfuric acid.
• Fine particles (PM2.5) average 6.6 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 43,120 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 20645

• Superfund sites nearbyD
• Factories and industrial sitesA
• Oil and gas wellsA
• Parks and nature nearbyC
• Air qualityA
• Drinking water qualityA to F
• Pesticide useD
• Neighborhood health statusD
• Past wildfire impactsA
• Past flood impactsC
• Noise levelsA
• Radiation signalsB

Based on 1 census tract · compiled October 25, 2026 · how each grade works and its sources

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