Costilla County, CO

ZIP 81151

In ZIP 81151, 4 of the 12 things we check have at least one part graded D or F.

• Drinking water: Costilla Mdwca meets every EPA legal limit; 8 contaminants are above health goals, led by di(2-ethylhexyl) phthalate at 6.3× California’s Public Health Goal.
• Closer to Superfund sites than 53% of U.S. neighborhoods, with no listed site within 10 miles of its center.
• Largest share of modeled toxic air from industry: Alta Fuels Inc. (100%), mostly benzene.
• Fine particles (PM2.5) average 4.1 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 189,884 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 81151

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

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

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