San Jacinto County, TX
ZIP 77378
In ZIP 77378, 5 of the 12 things we check have at least one part graded D or F.
- Drinking water: Mercy Wsc meets every EPA legal limit; 6 contaminants are above health goals, led by arsenic at 723× California’s Public Health Goal.
- Nearest Superfund site: United Creosoting Co., 5.6 miles away (2 within 10 miles).
- Largest share of modeled toxic air from industry: Huntsman Petrochemical LLC (83%), mostly ethylene oxide.
- Fine particles (PM2.5) average 7.3 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
- About 7,023 kg of agricultural pesticides are applied in the county each year.
Grades for ZIP 77378
- Superfund sites nearbyA to D
- Factories and industrial sitesB to F
- Oil and gas wellsB to D
- Parks and nature nearbyB to C
- Air qualityB to C
- Drinking water qualityA to C
- Pesticide useB to D
- Neighborhood health statusC to F
- Past wildfire impactsA
- Past flood impactsC
- Noise levelsA to C
Based on 8 census tracts · compiled October 25, 2026 · how each grade works and its sources
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