San Jacinto County, TX

ZIP 77328

In ZIP 77328, 3 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: Conroe Creosoting Co., 9.9 miles away.
• Largest share of modeled toxic air from industry: Huntsman Petrochemical LLC (77%), 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 77328

• Superfund sites nearbyA to C
• Factories and industrial sitesB to C
• Oil and gas wellsC to D
• Parks and nature nearbyA 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
• Radiation signalsA

Based on 7 census tracts · compiled October 25, 2026 · how each grade works and its sources

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