Delaware County, OK

ZIP 74344

In ZIP 74344, 4 of the 12 things we check have at least one part graded D or F.

• Drinking water: Grand Lake Pwa has 1 contaminant at or over an EPA legal limit; 9 contaminants are above health goals, led by arsenic at 775× California’s Public Health Goal.
• Nearest Superfund site: Tar Creek (ottawa County), 6.6 miles away.
• Largest share of modeled toxic air from industry: Owens Corning Insulating Systems LLC (48%), mostly formaldehyde.
• Fine particles (PM2.5) average 7.2 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 72,563 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 74344

• Superfund sites nearbyA to F
• Factories and industrial sitesA
• Oil and gas wellsA
• Parks and nature nearbyC
• Air qualityB
• Drinking water qualityA to D
• Pesticide useD to F
• Neighborhood health statusF
• Past wildfire impactsA
• Past flood impactsA
• Noise levelsA
• Radiation signalsB to C

Based on 8 census tracts · compiled October 25, 2026 · how each grade works and its sources

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