Humphreys County, MS

ZIP 39166

In ZIP 39166, 3 of the 12 things we check have at least one part graded D or F.

• Drinking water: Humphreys Co. W/A #1-Midnight meets every EPA legal limit; 5 contaminants are above health goals, led by arsenic at 125× 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: Cf Industries Nitrogen LLC - Yazoo City Mississippi Plant (63%), mostly chromium compounds.
• Fine particles (PM2.5) average 7.2 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 312,102 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 39166

• Superfund sites nearbyA
• Factories and industrial sitesA
• Oil and gas wellsA
• Parks and nature nearbyC
• Air qualityB
• Drinking water qualityD
• Pesticide useF
• Neighborhood health statusF
• Noise levelsA
• Radiation signalsC

Based on 1 census tract · compiled September 10, 2026 · how each grade works and its sources

Loading the full report, with every source…