County Water Quality Report

Williamson County, Texas

4 public water systems serving 507,570 residents

Data sources: EPA SDWIS EPA ECHO EWG Tap Water Database Utility CCRs ⓘ How did we get these ratings?
County average grade
D
62/100
Utilities rated 4
Population served 507,570
🇪🇺 Would fail EU standards 2 of 4

Top water quality concerns in Williamson County

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

All utilities in Williamson County

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

C
67/100

CITY OF LEANDER

LEANDER · 98,330 residents

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

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C
65/100

CITY OF ROUND ROCK

ROUND ROCK · 130,662 residents

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

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D
62/100

CITY OF CEDAR PARK

CEDAR PARK · 86,939 residents

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

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D
55/100

CITY OF GEORGETOWN

GEORGETOWN · 191,639 residents

Top concern: PFAS contamination

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