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County Water Quality Report

Dane County, Wisconsin

2 public water systems serving 531,000 residents

Data sources: EPA SDWIS EPA ECHO EWG Tap Water Database Utility CCRs ⓘ How did we get these ratings?
County average grade
D
66/100
Utilities rated 2
Population served 531,000
Most recent test 2024

Top water quality concerns in Dane County

  • PFAS contaminationin 1 of 2 utilities
  • Perfluorohexane sulfonate (PFHXS) significantly above health guidelinein 1 of 2 utilities
  • Radon significantly above health guidelinein 1 of 2 utilities
  • Total PFOS and PFOA significantly above health guidelinein 1 of 2 utilities
  • Lead detected in source waterin 1 of 2 utilities

All utilities in Dane County

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

C
72/100

Madison Department of Public Works

Madison · 259,000 residents

Top concern: Lead detected in source water

View report →
D
59/100

MADISON WATER UTILITY

MADISON · 272,000 residents

Top concern: PFAS contamination

View report →