Johnston County, NC

ZIP 27520

In ZIP 27520, 6 of the 12 things we check have at least one part graded D or F.

• Drinking water: Camelot S/D has 1 contaminant at or over an EPA legal limit; 7 contaminants are above health goals, led by lead at 40× California’s Public Health Goal.
• Closer to Superfund sites than 65% of U.S. neighborhoods, with no listed site within 10 miles of its center.
• Largest share of modeled toxic air from industry: Mallinckrodt Pharmaceuticals (70%), mostly nitrobenzene.
• Fine particles (PM2.5) average 6.9 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 519,890 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 27520

• Superfund sites nearbyA to D
• Factories and industrial sitesA to D
• Oil and gas wellsA
• Parks and nature nearbyB to D
• Air qualityB
• Drinking water qualityA to F
• Pesticide useC to F
• Neighborhood health statusA to F
• Past wildfire impactsA
• Past flood impactsB to C
• Noise levelsA to C
• Radiation signalsB to C

Based on 17 census tracts · compiled October 25, 2026 · how each grade works and its sources

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