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Water system · PWSID OR4100457

LAKE OSWEGO MUNICIPAL WATER

LAKE OSWEGO, OR · ~40,000 people served

Check your exact address → LAKE OSWEGO overview
100
Excellent
PurityRadar safety score

PWSID

OR4100457

State

Oregon

City

LAKE OSWEGO

Population served

40,000

Primary source

SWP

Score history

No change since tracking began Jun 18, 2026.

Jun 18, 2026 · score 100 Jun 18, 2026 · score 100

2 score updates logged since tracking began Jun 18, 2026. Each future EPA re-score adds a point.

PFAS & contaminant readings

No PFAS detections are on record for this system from EPA’s UCMR5 monitoring (2023–25). Absence of a detection isn’t a guarantee — not every system was sampled, and this dataset doesn’t cover other contaminants.

Violations & enforcement

34

Violations on record

0

Unaddressed

1

Health-based

36

Enforcement actions

From EPA ECHO (SDWIS), most recent enforcement Sep 2025. Official EPA record →

Other · EPA contaminant 7000 began Jul 2025 Resolved
Other · EPA contaminant 7000 began Jul 2024 Resolved
Monitoring & reporting · EPA contaminant 1011 began Jan 2019 Resolved
Monitoring & reporting · Total coliform began Aug 2009 Resolved
Monitoring & reporting · Chlorite began Apr 2008 Resolved
Monitoring & reporting · EPA contaminant 2968 began Jan 2008 Resolved
Monitoring & reporting · EPA contaminant 2979 began Jan 2008 Resolved
Monitoring & reporting · EPA contaminant 2380 began Jan 2008 Resolved
Monitoring & reporting · EPA contaminant 2976 began Jan 2008 Resolved
Monitoring & reporting · EPA contaminant 2955 began Jan 2008 Resolved
Monitoring & reporting · EPA contaminant 2964 began Jan 2008 Resolved
Monitoring & reporting · EPA contaminant 2378 began Jan 2008 Resolved

Recent enforcement actions

  • State action · SOX Sep 2025
  • State action · SOX Jul 2024
  • State action · SOX Apr 2019
  • State action · SOX Oct 2009
  • State action · SIA Sep 2009
  • State action · SOX May 2009
  • State action · SOX May 2009
  • State action · SOX May 2009

This profile is built from EPA public records for system OR4100457 — SDWIS violations and UCMR5 PFAS sampling. The score is system-level and can’t account for your home’s plumbing (older pipes can add lead at the tap). For health decisions, check your exact address, read the utility’s Consumer Confidence Report, and confirm with your provider.