Benton County, WA

ZIP 99337

In ZIP 99337, 8 of the 12 things we check have at least one part graded D or F.

• Drinking water: Sundance Improvement Association has 1 contaminant at or over an EPA legal limit; 11 contaminants are above health goals, led by pfos at 5.1× California’s Public Health Goal.
• Nearest Superfund site: Pasco Sanitary Landfill, 7.6 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 7.3 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 99337

• Superfund sites nearbyC to D
• Factories and industrial sitesB to F
• Oil and gas wellsA to C
• Parks and nature nearbyB to C
• Air qualityA to C
• Drinking water qualityB to D
• 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 9 census tracts · compiled October 25, 2026 · how each grade works and its sources

Loading the full report, with every source…