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Lake Oswego, OR

—no score

Contamination score

Higher = more contaminated vs. other cities.

⚠️1 health-based violation on record.
0
Water sources
4
Violations
0
Pollution sources
0
Self-reported
0
Lawsuits

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Reported illness & cancer claims

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Self-reported issues

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Pollution sources & reported claims near your water

Factories, greenhouses, and contaminated sites mapped around the water supply. Tap any circle for detail.

Critical High Medium Reported claim

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Public water systems

LAKE OSWEGO MUNICIPAL WATER

PWSID:
OR4100457
Source:
Surface water
Serves:
40,000 people

EPA & DEP violations

LAKE OSWEGO MUNICIPAL WATER

PWSID OR41004574 violations

  • Other violation — LAKE OSWEGO MUNICIPAL WATER

    low severityResolved

    EPA SDWIS violation 900692820 (code 71) at LAKE OSWEGO MUNICIPAL WATER (PWSID OR4100457).

    EPA SDWIS · Other violation · Began Jul 1, 2025 · 1 year ago · Source ↗

  • Other violation — LAKE OSWEGO MUNICIPAL WATER

    low severityResolved

    EPA SDWIS violation 900692819 (code 71) at LAKE OSWEGO MUNICIPAL WATER (PWSID OR4100457).

    EPA SDWIS · Other violation · Began Jul 1, 2024 · 2 years ago · Source ↗

  • Monitoring violation — LAKE OSWEGO MUNICIPAL WATER

    low severityResolved

    EPA SDWIS violation 900692817 (code 27) at LAKE OSWEGO MUNICIPAL WATER (PWSID OR4100457).

    EPA SDWIS · Monitoring violation · Began Jan 1, 2019 · 7 years ago · Source ↗

  • Treatment technique violation — LAKE OSWEGO MUNICIPAL WATER

    high severityHealth-basedResolved

    EPA SDWIS violation 691198 (code 58) at LAKE OSWEGO MUNICIPAL WATER (PWSID OR4100457).

    EPA SDWIS · Treatment technique violation · Began Jan 1, 2000 · 26 years ago · Source ↗

Water-related lawsuits

No lawsuits on record.

In the news & sources

No coverage linked yet.