Caroline County, MD

ZIP 21640

In ZIP 21640, 4 of the 12 things we check have at least one part graded D or F.

• Drinking water: Town Of Sudlersville meets every EPA legal limit; 6 contaminants are above health goals, led by arsenic at 1,191× California’s Public Health Goal.
• Closer to Superfund sites than 0% of U.S. neighborhoods, with no listed site within 10 miles of its center.
• Largest share of modeled toxic air from industry: Tnemec Co Inc (35%), mostly diisocyanates.
• Fine particles (PM2.5) average 7.0 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 193,271 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 21640

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

Based on 4 census tracts · compiled September 10, 2026 · how each grade works and its sources

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