Hidalgo County, TX

ZIP 78558

In ZIP 78558, 5 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; 13 contaminants are above health goals, led by lithium at 3.8× the USGS health-based screening level.
• Nearest Superfund site: Donna Reservoir and Canal System, 9.9 miles away.
• Largest share of modeled toxic air from industry: Ge Engine Services Mcallen LP (96%), mostly cobalt.
• Fine particles (PM2.5) average 8.4 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 78558

• Superfund sites nearbyA to C
• Factories and industrial sitesC
• Oil and gas wellsF
• Parks and nature nearbyD
• Air qualityD
• Drinking water qualityC
• Pesticide useF
• Neighborhood health statusC to D
• Past wildfire impactsA
• Past flood impactsA
• Noise levelsA
• Radiation signalsB

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

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