Montgomery County, TX

ZIP 77356

In ZIP 77356, 7 of the 12 things we check have at least one part graded D or F.

• Drinking water: Vista Verde Water Systems has 2 contaminants at or over an EPA legal limit; 5 contaminants are above health goals, led by arsenic at 413× California’s Public Health Goal.
• Nearest Superfund site: United Creosoting Co., 7.1 miles away (2 within 10 miles).
• Largest share of modeled toxic air from industry: Huntsman Petrochemical LLC (78%), 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 43,817 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 77356

• Superfund sites nearbyA to D
• Factories and industrial sitesA to D
• Oil and gas wellsB to D
• Parks and nature nearbyA to D
• Air qualityB to C
• Drinking water qualityA to F
• Pesticide useA to F
• Neighborhood health statusC to F
• Past wildfire impactsA
• Past flood impactsC
• Noise levelsA

Based on 17 census tracts · compiled October 25, 2026 · how each grade works and its sources

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