County Water Quality Report

Jefferson County, Kentucky

2 public water systems serving 1,381,769 residents

Data sources: EPA SDWIS EPA ECHO EWG Tap Water Database Utility CCRs ⓘ How did we get these ratings?
County average grade
D
64/100
Utilities rated 2
Population served 1,381,769
Most recent test 2024

Top water quality concerns in Jefferson County

  • PFAS contaminationin 1 of 2 utilities
  • Haloacetic acids (HAA9) significantly above health guidelinein 1 of 2 utilities
  • Total trihalomethanes (TTHMs) significantly above health guidelinein 1 of 2 utilities
  • Haloacetic acids (HAA5) significantly above health guidelinein 1 of 2 utilities
  • Lead detected in source waterin 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

City of Louisville Water Department

Louisville · 617,000 residents

Top concern: Lead detected in source water

View report →
D
62/100

LOUISVILLE WATER COMPANY

LOUISVILLE · 764,769 residents

Top concern: PFAS contamination

View report →