Hill County, TX

ZIP 76631

In ZIP 76631, 4 of the 12 things we check have at least one part graded D or F.

• Drinking water: City Of Hillsboro meets every EPA legal limit; 9 contaminants are above health goals, led by pfoa at 300× 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: Martin Marietta North Texas Cement LLC (24%), mostly chromium compounds.
• Fine particles (PM2.5) average 7.3 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 171,478 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 76631

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

Based on 2 census tracts · compiled October 25, 2026 · how each grade works and its sources

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