Johnston County, NC

ZIP 27577

In ZIP 27577, 5 of the 12 things we check have at least one part graded D or F.

• Drinking water: Town Of Clayton - North meets every EPA legal limit; 8 contaminants are above health goals, led by lead at 43× 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 (68%), mostly nitrobenzene.
• Fine particles (PM2.5) average 6.8 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 27577

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

Based on 13 census tracts · compiled September 10, 2026 · how each grade works and its sources

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