Charleston County, SC

ZIP 29420

In ZIP 29420, 5 of the 12 things we check have at least one part graded D or F.

• Drinking water: Dcws Ashley Phosphate (Sc1820008) has 2 contaminants at or over an EPA legal limit; 11 contaminants are above health goals, led by pfos at 6.6× California’s Public Health Goal.
• Nearest Superfund site: Geiger (c & M Oil), 9.4 miles away.
• Largest share of modeled toxic air from industry: Lanxess Corp (26%), mostly ethylene oxide.
• Fine particles (PM2.5) average 7.5 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 80,803 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 29420

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

Based on 6 census tracts · compiled September 10, 2026 · how each grade works and its sources

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