Charles County, MD

ZIP 20658

In ZIP 20658, 4 of the 12 things we check have at least one part graded D or F.

• Drinking water: Town Of Indian Head meets every EPA legal limit; 8 contaminants are above health goals, led by arsenic at 589× California’s Public Health Goal.
• Nearest Superfund site: Indian Head Naval Surface Warfare Center, 2.3 miles away.
• Largest share of modeled toxic air from industry: Micron Technology Inc. (38%), mostly chlorine.
• Fine particles (PM2.5) average 6.8 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 20658

• Superfund sites nearbyF
• Factories and industrial sitesA
• Oil and gas wellsA
• Parks and nature nearbyC
• Air qualityB
• Drinking water qualityC to D
• Pesticide useD
• Neighborhood health statusD
• Past wildfire impactsA
• Past flood impactsC
• Noise levelsA
• Radiation signalsC

Based on 1 census tract · compiled September 10, 2026 · how each grade works and its sources

Loading the full report, with every source…