Hidalgo County, TX

ZIP 78577

In ZIP 78577, 8 of the 12 things we check have at least one part graded D or F.

• Drinking water: North Alamo Wsc meets every EPA legal limit; 21 contaminants are above health goals, led by lead at 55× California’s Public Health Goal.
• Nearest Superfund site: Donna Reservoir and Canal System, 7.2 miles away.
• Largest share of modeled toxic air from industry: Ge Engine Services Mcallen LP (100%), mostly cobalt.
• Fine particles (PM2.5) average 10.1 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 764,635 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 78577

• Superfund sites nearbyA to D
• Factories and industrial sitesB to C
• Oil and gas wellsD to F
• Parks and nature nearbyC to F
• Air qualityF
• Drinking water qualityD to F
• Pesticide useD to F
• Neighborhood health statusB to D
• Past wildfire impactsA
• Past flood impactsA
• Noise levelsA to D
• Radiation signalsC

Based on 20 census tracts · compiled September 10, 2026 · how each grade works and its sources

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