Montgomery County, TX

ZIP 77355

In ZIP 77355, 5 of the 12 things we check have at least one part graded D or F.

• Drinking water: Towering Oaks And Rosewood Hills Subdivi meets every EPA legal limit; 3 contaminants are above health goals, led by arsenic at 496× California’s Public Health Goal.
• Closer to Superfund sites than 0% of U.S. neighborhoods, with no listed site within 10 miles of its center.
• Largest share of modeled toxic air from industry: Huntsman Petrochemical LLC (30%), mostly chromium.
• Fine particles (PM2.5) average 7.3 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 90,852 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 77355

• Superfund sites nearbyA
• Factories and industrial sitesC to D
• Oil and gas wellsD
• Parks and nature nearbyC
• Air qualityC
• Drinking water qualityA to F
• Pesticide useA to D
• Neighborhood health statusB to D
• Past wildfire impactsA
• Past flood impactsC
• Noise levelsA
• Radiation signalsA

Based on 8 census tracts · compiled October 25, 2026 · how each grade works and its sources

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