Collin County, TX

ZIP 75166

In ZIP 75166, 2 of the 12 things we check have at least one part graded D or F.

• Drinking water: City Of Royse City meets every EPA legal limit; 9 contaminants are above health goals, led by bromodichloromethane at 200× California’s Public Health Goal.
• 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: Tower Extrusions LLC (26%), mostly chromium.
• Fine particles (PM2.5) average 7.9 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 74,718 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 75166

• Superfund sites nearbyA
• Factories and industrial sitesA
• Oil and gas wellsC
• Parks and nature nearbyC
• Air qualityC to D
• Drinking water qualityC
• Pesticide useD
• Neighborhood health statusB
• Past wildfire impactsA
• Past flood impactsA
• Noise levelsA
• Radiation signalsB

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

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