County Water Quality Report

Collin County, Texas

5 public water systems serving 1,140,882 residents

Data sources: EPA SDWIS EPA ECHO EWG Tap Water Database Utility CCRs ⓘ How did we get these ratings?
County average grade
D
69/100
Utilities rated 5
Population served 1,140,882
Most recent test 2024
🇪🇺 Would fail EU standards 4 of 5

Top water quality concerns in Collin County

  • Haloacetic acids (HAA9) significantly above health guidelinein 4 of 5 utilities
  • Bromochloroacetic acid significantly above health guidelinein 4 of 5 utilities
  • Total trihalomethanes (TTHMs) significantly above health guidelinein 4 of 5 utilities
  • Haloacetic Acids (HAA5) significantly above health guidelinein 1 of 5 utilities
  • Total Trihalomethanes (TTHMs) significantly above health guidelinein 1 of 5 utilities

All utilities in Collin County

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

B
77/100

Plano Department of Public Works

Plano · 288,000 residents

Top concern: Haloacetic Acids (HAA5) significantly above health guideline

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C
67/100

CITY OF FRISCO

FRISCO · 231,910 residents

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

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C
67/100

CITY OF PLANO

PLANO · 292,059 residents

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

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C
67/100

CITY OF MCKINNEY

MCKINNEY · 224,043 residents

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

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C
65/100

CITY OF ALLEN

ALLEN · 104,870 residents

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

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