Llano County, TX

ZIP 78639

In ZIP 78639, 5 of the 12 things we check have at least one part graded D or F.

• Drinking water: City Of Horseshoe Bay meets every EPA legal limit; 10 contaminants are above health goals, led by lead at 32× California’s Public Health Goal.
• Nearest Superfund site: Main Street Ground Water Plume, 9.1 miles away.
• Largest share of modeled toxic air from industry: Entegris Inc (81%), mostly catechol.
• Fine particles (PM2.5) average 7.0 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 7,674 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 78639

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

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

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