Callahan County, TX

ZIP 79504

In ZIP 79504, 5 of the 12 things we check have at least one part graded D or F.

• Drinking water: Potosi Wsc has 2 contaminants at or over an EPA legal limit; 11 contaminants are above health goals, led by pfos at 18× 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: Petrosmith Equipment LP (95%), mostly chromium.
• Fine particles (PM2.5) average 6.3 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 16,850 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 79504

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

Based on 4 census tracts · compiled October 25, 2026 · how each grade works and its sources

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