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County Water Quality Report

Washington County, Oregon

4 public water systems serving 467,777 residents

Data sources: EPA SDWIS EPA ECHO EWG Tap Water Database Utility CCRs ⓘ How did we get these ratings?
County average grade
B
85/100
Utilities rated 4
Population served 467,777

Top water quality concerns in Washington County

  • Haloacetic acids (HAA9) significantly above health guidelinein 4 of 4 utilities
  • Total trihalomethanes (TTHMs) significantly above health guidelinein 4 of 4 utilities
  • Haloacetic acids (HAA5) significantly above health guidelinein 4 of 4 utilities

All utilities in Washington County

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

A
87/100

TUALATIN VALLEY WATER DISTRICT

BEAVERTON · 224,600 residents

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

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A
85/100

HILLSBORO, CITY OF

HILLSBORO · 92,632 residents

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

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B
84/100

TIGARD, CITY OF

TIGARD · 62,500 residents

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

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B
83/100

BEAVERTON, CITY OF

BEAVERTON · 88,045 residents

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

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