Guaynabo Municipio, PR

ZIP 00971

In ZIP 00971, 3 of the 12 things we check have at least one part graded D or F.

• Nearest Superfund site: Hormigas Ground Water Plume, 5.1 miles away (2 within 10 miles).
• Largest share of modeled toxic air from industry: Steri-Tech Inc. (55%), mostly ethylene oxide.
• Fine particles (PM2.5) average 8.3 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.

Grades for ZIP 00971

• Superfund sites nearbyA
• Factories and industrial sitesC to D
• Oil and gas wellsA
• Air qualityD
• Past wildfire impactsA
• Past flood impactsD

Based on 14 census tracts · compiled September 10, 2026 · how each grade works and its sources

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