Harris County, TX
ZIP 77521
In ZIP 77521, 9 of the 12 things we check have at least one part graded D or F.
- Drinking water: Sjolander Road Mobile Home Park has 1 contaminant at or over an EPA legal limit; 10 contaminants are above health goals, led by lead at 46× California’s Public Health Goal.
- Nearest Superfund site: San Jacinto River Waste Pits, 3.2 miles away (3 within 10 miles).
- Largest share of modeled toxic air from industry: Equistar Chemicals Bayport Chemicals Plant (43%), mostly ethylene oxide.
- Fine particles (PM2.5) average 8.9 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
- About 69,664 kg of agricultural pesticides are applied in the county each year.
Grades for ZIP 77521
- Superfund sites nearbyA to F
- Factories and industrial sitesF
- Oil and gas wellsD to F
- Parks and nature nearbyC to F
- Air qualityC to F
- Drinking water qualityC to F
- Pesticide useB to F
- Neighborhood health statusA to D
- Past wildfire impactsA
- Past flood impactsC
- Noise levelsA to D
- Radiation signalsB to C
Based on 16 census tracts · compiled September 10, 2026 · how each grade works and its sources
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