Benton County, WA

ZIP 99350

In ZIP 99350, 7 of the 12 things we check have at least one part graded D or F.

• Drinking water: West Richland City Of meets every EPA legal limit; 14 contaminants are above health goals, led by pfos at 2.1× California’s Public Health Goal.
• Closer to Superfund sites than 62% of U.S. neighborhoods, with no listed site within 10 miles of its center.
• Largest share of modeled toxic air from industry: Alto Columbia LLC (66%), mostly acetaldehyde.
• Fine particles (PM2.5) average 6.7 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 2,424,406 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 99350

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

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

Loading the full report, with every source…