Medina County, TX

ZIP 78253

In ZIP 78253, 5 of the 12 things we check have at least one part graded D or F.

• Drinking water: City Of Castroville meets every EPA legal limit; 7 contaminants are above health goals, led by lead at 31× California’s Public Health Goal.
• Nearest Superfund site: River City Metal Finishing, 5.4 miles away (2 within 10 miles).
• Largest share of modeled toxic air from industry: Arvin Sango (50%), mostly chromium.
• Fine particles (PM2.5) average 8.3 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 154,767 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 78253

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

Based on 11 census tracts · compiled September 10, 2026 · how each grade works and its sources

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