Thurston County, WA

ZIP 98556

In ZIP 98556, 2 of the 12 things we check have at least one part graded D or F.

• Drinking water: Whispering Woods Home Park meets every EPA legal limit; 3 contaminants are above health goals, led by pfos at 1.8× California’s Public Health Goal.
• Nearest Superfund site: Palermo Well Field Ground Water Contamination, 8.8 miles away.
• Largest share of modeled toxic air from industry: Kloeckner Metals Corp (53%), mostly chromium.
• Fine particles (PM2.5) average 4.8 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 11,135 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 98556

• Superfund sites nearbyA to D
• Factories and industrial sitesA
• Oil and gas wellsA to C
• Parks and nature nearbyB to C
• Air qualityA
• Drinking water qualityA to C
• Pesticide useB to C
• Neighborhood health statusD
• Past wildfire impactsA
• Past flood impactsA
• Noise levelsA
• Radiation signalsA

Based on 2 census tracts · compiled October 25, 2026 · how each grade works and its sources

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