County Water Quality Report

Snohomish County, Washington

6 public water systems serving 751,018 residents

Data sources: EPA SDWIS EPA ECHO EWG Tap Water Database Utility CCRs ⓘ How did we get these ratings?
County average grade
D
65/100
Utilities rated 6
Population served 751,018
🇪🇺 Would fail EU standards 1 of 6

Top water quality concerns in Snohomish County

  • Haloacetic acids (HAA9) significantly above health guidelinein 6 of 6 utilities
  • Haloacetic acids (HAA5) significantly above health guidelinein 6 of 6 utilities
  • Total trihalomethanes (TTHMs) significantly above health guidelinein 4 of 6 utilities
  • Arsenic significantly above health guidelinein 2 of 6 utilities

All utilities in Snohomish County

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

C
67/100

ALDERWOOD WATER DISTRICT

Lynnwood · 245,715 residents

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

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C
67/100

EVERETT PUBLIC WORKS DEPT. CITY OF

Everett · 215,774 residents

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

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C
67/100

SILVER LAKE WATER & SEWER DISTRICT

Bothell · 65,033 residents

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

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C
65/100

LYNNWOOD CITY OF

Lynnwood · 68,204 residents

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

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D
62/100

MARYSVILLE UTILITIES

Marysville · 88,582 residents

Top concern: Arsenic significantly above health guideline

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D
62/100

SNO PUD 1 - LAKE STEVENS

Everett · 67,710 residents

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

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