County Water Quality Report

Rock County, Wisconsin

1 public water system serving 64,415 residents

Data sources: EPA SDWIS EPA ECHO EWG Tap Water Database Utility CCRs ⓘ How did we get these ratings?
County average grade
F
54/100
Utilities rated 1
Population served 64,415

Top water quality concerns in Rock County

  • PFAS contaminationin 1 of 1 utilities
  • Perfluorohexane sulfonate (PFHXS) significantly above health guidelinein 1 of 1 utilities
  • Total trihalomethanes (TTHMs) significantly above health guidelinein 1 of 1 utilities
  • Bromodichloromethane significantly above health guidelinein 1 of 1 utilities

All utilities in Rock County

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

F
54/100

JANESVILLE WATER UTILITY

JANESVILLE · 64,415 residents

Top concern: PFAS contamination

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