Harris County, TX

ZIP 77336

In ZIP 77336, 4 of the 12 things we check have at least one part graded D or F.

• Drinking water: Walraven Subdivision meets every EPA legal limit; 3 contaminants are above health goals, led by arsenic at 663× California’s Public Health Goal.
• Closer to Superfund sites than 58% of U.S. neighborhoods, with no listed site within 10 miles of its center.
• Largest share of modeled toxic air from industry: Equistar Chemicals Bayport Chemicals Plant (24%), mostly ethylene oxide.
• Fine particles (PM2.5) average 8.4 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 38,374 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 77336

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

Based on 3 census tracts · compiled October 25, 2026 · how each grade works and its sources

Loading the full report, with every source…