Hidalgo County, TX

ZIP 78557

In ZIP 78557, 4 of the 12 things we check have at least one part graded D or F.

• Drinking water: City Of Hidalgo Water System meets every EPA legal limit; 12 contaminants are above health goals, led by lithium at 5.9× the USGS health-based screening level.
• 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: Ge Engine Services Mcallen LP (100%), mostly cobalt.
• Fine particles (PM2.5) average 10.2 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 78557

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

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

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