County Water Quality Report

Multnomah County, Oregon

4 public water systems serving 1,459,575 residents

Data sources: EPA SDWIS EPA ECHO EWG Tap Water Database Utility CCRs ⓘ How did we get these ratings?
County average grade
C
72/100
Utilities rated 4
Population served 1,459,575
Most recent test 2024

Top water quality concerns in Multnomah County

  • Haloacetic acids (HAA9) significantly above health guidelinein 3 of 4 utilities
  • Haloacetic acids (HAA5) significantly above health guidelinein 3 of 4 utilities
  • Total trihalomethanes (TTHMs) significantly above health guidelinein 3 of 4 utilities
  • Arsenic detectedin 2 of 4 utilities
  • Lead detected in source waterin 1 of 4 utilities

All utilities in Multnomah County

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

B
81/100

GRESHAM, CITY OF

GRESHAM · 73,932 residents

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

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C
74/100

ROCKWOOD PUD

PORTLAND · 65,443 residents

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

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C
72/100

PORTLAND WATER BUREAU

PORTLAND · 666,200 residents

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

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D
63/100

Portland Water Authority

Portland · 654,000 residents

Top concern: Lead detected in source water

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