Benton County, WA

ZIP 99338

In ZIP 99338, 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.
• 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: Tidewater Terminal Co Snake River Terminal (43%), 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 99338

• Superfund sites nearbyA to C
• Factories and industrial sitesA to C
• Oil and gas wellsA to B
• Parks and nature nearbyC to F
• Air qualityA to C
• Drinking water qualityC to F
• Pesticide useF
• Neighborhood health statusB to F
• Past wildfire impactsA to F
• Past flood impactsA
• Noise levelsA to D
• Radiation signalsC to D

Based on 8 census tracts · compiled September 10, 2026 · how each grade works and its sources

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