Benton County, WA

ZIP 99336

In ZIP 99336, 7 of the 12 things we check have at least one part graded D or F.

• Drinking water: Richland City Of has 2 contaminants at or over an EPA legal limit; 14 contaminants are above health goals, led by pfos at 12× California’s Public Health Goal.
• Nearest Superfund site: Pasco Sanitary Landfill, 5.2 miles away.
• Largest share of modeled toxic air from industry: Tidewater Terminal Co Snake River Terminal (57%), mostly metham sodium (sodium methyldithiocarbamate).
• Fine particles (PM2.5) average 7.4 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 3,566,627 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 99336

• Superfund sites nearbyA to D
• Factories and industrial sitesB to C
• Oil and gas wellsA to B
• Parks and nature nearbyD to F
• Air qualityB to C
• Drinking water qualityF
• Pesticide useF
• Neighborhood health statusC to D
• Past wildfire impactsA
• Past flood impactsA
• Noise levelsA to D
• Radiation signalsD

Based on 12 census tracts · compiled September 10, 2026 · how each grade works and its sources

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