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
F
58/100
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

All utilities in Arapahoe County

Click any utility for full grade card, contaminant data, and treatment plant contact info.

C
69/100

Aurora Water Utilities

Aurora · 374,000 residents

Top concern: Haloacetic Acids (HAA5) significantly above health guideline

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C
67/100

SOUTHGATE WSD

CENTENNIAL · 55,000 residents

Top concern: Haloacetic acids (HAA9)* significantly above health guideline

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D
55/100

AURORA CITY OF

AURORA · 533,407 residents

Top concern: PFAS contamination

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F
50/100

ENGLEWOOD CITY OF

ENGLEWOOD · 57,332 residents

Top concern: PFAS contamination

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F
47/100

EAST CHERRY CREEK VALLEY WSD

AURORA · 66,130 residents

Top concern: PFAS contamination

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