Harris County, TX

ZIP 77066

In ZIP 77066, 7 of the 12 things we check have at least one part graded D or F.

• Drinking water: Northwest Harris County Mud 24 meets every EPA legal limit; 10 contaminants are above health goals, led by lead at 78× California’s Public Health Goal.
• Nearest Superfund site: Jones Road Ground Water Plume, 4.1 miles away.
• Largest share of modeled toxic air from industry: Lyondell Chemical Co (25%), mostly ethylene oxide.
• Fine particles (PM2.5) average 9.4 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 77066

• Superfund sites nearbyC to D
• Factories and industrial sitesD to F
• Oil and gas wellsD
• Parks and nature nearbyD to F
• Air qualityF
• Drinking water qualityD to F
• Pesticide useB to C
• Neighborhood health statusB to D
• Past wildfire impactsA
• Past flood impactsC
• Noise levelsA to B
• Radiation signalsB

Based on 9 census tracts · compiled September 10, 2026 · how each grade works and its sources

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