Grayson County, TX

ZIP 75459

In ZIP 75459, 5 of the 12 things we check have at least one part graded D or F.

• Drinking water: City Of Southmayd meets every EPA legal limit; 7 contaminants are above health goals, led by lead at 102× 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: Denison Industries (88%), mostly diisocyanates.
• Fine particles (PM2.5) average 7.3 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 71,861 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 75459

• Superfund sites nearbyA
• Factories and industrial sitesB
• Oil and gas wellsC to D
• Parks and nature nearbyC to D
• Air qualityC
• Drinking water qualityC to F
• Pesticide useF
• Neighborhood health statusC to D
• Past wildfire impactsA
• Past flood impactsA
• Noise levelsA
• Radiation signalsC

Based on 3 census tracts · compiled September 10, 2026 · how each grade works and its sources

Loading the full report, with every source…