Charleston County, SC

ZIP 29426

In ZIP 29426, 4 of the 12 things we check have at least one part graded D or F.

• Drinking water: Dcwa Knightsville (Sc1820001) has 2 contaminants at or over an EPA legal limit; 16 contaminants are above health goals, led by pfos at 7.2× 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: Century Aluminum Of South Carolina (28%), mostly ethylene oxide.
• Fine particles (PM2.5) average 6.5 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 29426

• Superfund sites nearbyA
• Factories and industrial sitesB to C
• Oil and gas wellsA to B
• Parks and nature nearbyB
• Air qualityA
• Drinking water qualityA to F
• Pesticide useD to F
• Neighborhood health statusB to D
• Past wildfire impactsA
• Past flood impactsC
• Noise levelsA to D
• Radiation signalsB

Based on 2 census tracts · compiled September 10, 2026 · how each grade works and its sources

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