County Water Quality Report

Arapahoe County, Colorado

5 public water systems serving 1,085,869 residents

Data sources: EPA SDWIS EPA ECHO EWG Tap Water Database Utility CCRs ⓘ How did we get these ratings?

County average grade

62/100

Utilities rated 5

Population served 1,085,869

Most recent test 2024

Top water quality concerns in Arapahoe County

PFAS contaminationin 3 of 5 utilities
Haloacetic acids (HAA9) significantly above health guidelinein 3 of 5 utilities
Perfluorohexane sulfonate (PFHXS) significantly above health guidelinein 3 of 5 utilities
Arsenic detectedin 3 of 5 utilities
Total trihalomethanes (TTHMs) significantly above health guidelinein 2 of 5 utilities