County Water Quality Report

Jefferson County, Colorado

2 public water systems serving 253,010 residents

Data sources: EPA SDWIS EPA ECHO EWG Tap Water Database Utility CCRs ⓘ How did we get these ratings?
County average grade
D
61/100
Utilities rated 2
Population served 253,010

Top water quality concerns in Jefferson County

  • Haloacetic acids (HAA9) significantly above health guidelinein 2 of 2 utilities
  • Total trihalomethanes (TTHMs) significantly above health guidelinein 2 of 2 utilities
  • Haloacetic acids (HAA5) significantly above health guidelinein 1 of 2 utilities
  • Arsenic detectedin 1 of 2 utilities
  • PFAS contaminationin 1 of 2 utilities

All utilities in Jefferson County

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

C
67/100

ARVADA CITY OF

ARVADA · 171,610 residents

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

View report →
D
55/100

CONSOLIDATED MUTUAL MAPLE GROVE

LAKEWOOD · 81,400 residents

Top concern: PFAS contamination

View report →