Marion County, SC

ZIP 29574

In ZIP 29574, 3 of the 12 things we check have at least one part graded D or F.

• Drinking water: Marco Rural Water Co (Sc3320001) meets every EPA legal limit; 11 contaminants are above health goals, led by lead at 17× 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: Westrock Cp LLC (41%), mostly formaldehyde.
• Fine particles (PM2.5) average 6.3 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 154,878 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 29574

• Superfund sites nearbyA
• Factories and industrial sitesA to B
• Oil and gas wellsA
• Parks and nature nearbyC
• Air qualityA
• Drinking water qualityC to D
• Pesticide useF
• Neighborhood health statusD to F
• Past wildfire impactsA
• Past flood impactsC
• Noise levelsA to B
• Radiation signalsB to C

Based on 7 census tracts · compiled September 10, 2026 · how each grade works and its sources

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