Washington County, KS

ZIP 66958

In ZIP 66958, 3 of the 12 things we check have at least one part graded D or F.

• Drinking water: Barnes, City Of meets every EPA legal limit; 11 contaminants are above health goals, led by nitrate at 3.1× https://journals.plos.org/water/article?id=10.1371/journal.pwat.0000329, https://www.polkcountyiowa.gov/media/lixlchbz/ciswra-currents-of-change_final-scientific-assessment-of-source-water-research-report_jun272025.pdf#page=222.
• Closer to Superfund sites than 0% of U.S. neighborhoods, with no listed site within 10 miles of its center.
• Largest share of modeled toxic air from industry: Endicott Clay Products Co Inc (70%), mostly chromium compounds.
• Fine particles (PM2.5) average 6.4 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 260,527 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 66958

• Superfund sites nearbyA
• Factories and industrial sitesC
• Oil and gas wellsB to C
• Parks and nature nearbyC
• Air qualityA
• Drinking water qualityB to C
• Pesticide useF
• Neighborhood health statusD
• Past wildfire impactsA
• Past flood impactsC
• Noise levelsA
• Radiation signalsF

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

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