Harmon County, OK

ZIP 73550

In ZIP 73550, 2 of the 12 things we check have at least one part graded D or F.

• Drinking water: Rra Dodson Water System meets every EPA legal limit; 8 contaminants are above health goals, led by nitrate at 3.3× 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: American Gypsum Wallboard Plant (69%), mostly lead.
• Fine particles (PM2.5) average 5.6 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 64,879 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 73550

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

Based on 1 census tract · compiled October 25, 2026 · how each grade works and its sources

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