Simpson County, MS

ZIP 39111

In ZIP 39111, 6 of the 12 things we check have at least one part graded D or F.

• Drinking water: Smiths Crossing Water Assn has 1 contaminant at or over an EPA legal limit; 2 contaminants are above health goals, led by pfos at 9.7× 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: Howard Industries Inc. (76%), mostly chromium compounds.
• Fine particles (PM2.5) average 7.6 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 27,415 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 39111

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

Based on 8 census tracts · compiled September 10, 2026 · how each grade works and its sources

Loading the full report, with every source…