Charleston County, SC

ZIP 29403

In ZIP 29403, 8 of the 12 things we check have at least one part graded D or F.

• Drinking water: Mt Pleasant Water Works (1010002) has 2 contaminants at or over an EPA legal limit; 13 contaminants are above health goals, led by pfos at 6.6× California’s Public Health Goal.
• Nearest Superfund site: Koppers Co., Inc. (charleston Plant), 1.3 miles away (2 within 10 miles).
• Largest share of modeled toxic air from industry: Lanxess Corp (85%), mostly ethylene oxide.
• Fine particles (PM2.5) average 8.1 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 199,042 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 29403

• Superfund sites nearbyF
• Factories and industrial sitesC to F
• Oil and gas wellsA
• Parks and nature nearbyD to F
• Air qualityC to D
• Drinking water qualityF
• Pesticide useD to F
• Neighborhood health statusA to D
• Past wildfire impactsA
• Past flood impactsC
• Noise levelsA to D

Based on 11 census tracts · compiled September 10, 2026 · how each grade works and its sources

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