Iron County, MO

ZIP 63621

In ZIP 63621, 6 of the 12 things we check have at least one part graded D or F.

• Drinking water: Annapolis Pws has 1 contaminant at or over an EPA legal limit; 11 contaminants are above health goals, led by arsenic at 610× California’s Public Health Goal.
• Nearest Superfund site: Madison County Mines, 3.7 miles away.
• Largest share of modeled toxic air from industry: G.S. Roofing Products Co Inc. (68%), mostly chromium compounds.
• Fine particles (PM2.5) average 6.5 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 4,284 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 63621

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

Based on 4 census tracts · compiled October 25, 2026 · how each grade works and its sources

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