Rio Arriba County, NM

ZIP 87521

In ZIP 87521, 5 of the 12 things we check have at least one part graded D or F.

• Drinking water: Alcalde Mdwca has 1 contaminant at or over an EPA legal limit; 8 contaminants are above health goals, led by arsenic at 5,153× California’s Public Health Goal.
• Closer to Superfund sites than 69% of U.S. neighborhoods, with no listed site within 10 miles of its center.
• Fine particles (PM2.5) average 4.6 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 31,004 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 87521

• Superfund sites nearbyA to D
• Factories and industrial sitesA
• Oil and gas wellsA
• Parks and nature nearbyB
• Air qualityA
• Drinking water qualityC to F
• Pesticide useD to F
• Neighborhood health statusC to D
• Past wildfire impactsA to C
• Past flood impactsA
• Noise levelsA
• Radiation signalsD to F

Based on 4 census tracts · compiled September 10, 2026 · how each grade works and its sources

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