County Water Quality Report

Adams County, Colorado

4 public water systems serving 560,406 residents

Data sources: EPA SDWIS EPA ECHO EWG Tap Water Database Utility CCRs ⓘ How did we get these ratings?
County average grade
F
56/100
Utilities rated 4
Population served 560,406

Top water quality concerns in Adams County

  • Haloacetic acids (HAA9) significantly above health guidelinein 4 of 4 utilities
  • Total trihalomethanes (TTHMs) significantly above health guidelinein 3 of 4 utilities
  • PFAS contaminationin 2 of 4 utilities
  • Perfluorohexane sulfonate (PFHXS) significantly above health guidelinein 2 of 4 utilities
  • Arsenic detectedin 1 of 4 utilities

All utilities in Adams County

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

C
67/100

WESTMINSTER CITY OF

WESTMINSTER · 202,078 residents

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

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D
62/100

SOUTH ADAMS COUNTY WSD

COMMERCE CITY · 75,559 residents

Top concern: Arsenic significantly above health guideline

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F
48/100

BRIGHTON CITY OF

BRIGHTON · 56,304 residents

Top concern: PFAS contamination

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F
47/100

THORNTON CITY OF

THORNTON · 226,465 residents

Top concern: PFAS contamination

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