RIVERGROVE WATER DISTRICT

LAKE OSWEGO, OR · ~4,000 people served

Check your exact address → LAKE OSWEGO overview

100

Excellent

PurityRadar safety score

PWSID

OR4100461

State

Oregon

City

LAKE OSWEGO

Population served

4,000

Primary source

Groundwater

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

Latest detections from EPA’s UCMR5 monitoring (through Jun 2025). Levels in parts per trillion (ppt).

Lithium

12,000 ppt

limit —

No federal limit

Violations & enforcement

Violations on record

Unaddressed

Health-based

Enforcement actions

From EPA ECHO (SDWIS), most recent enforcement Jan 2021. Official EPA record →

Monitoring & reporting · EPA contaminant 3028 began Jan 2020 Resolved

Monitoring & reporting · EPA contaminant 3028 began Jan 2017 Resolved

Monitoring & reporting · Nitrate began Jan 2013 Resolved

Max contaminant level (MCL) · Total coliform health-based began Oct 2012 Resolved

Monitoring & reporting · EPA contaminant 3014 began Sep 2012 Resolved

Max contaminant level (MCL) · Total coliform health-based began Sep 2012 Resolved

Monitoring & reporting · EPA contaminant 2383 began Jan 2011 Resolved

Monitoring & reporting · EPA contaminant 2035 began Jan 2011 Resolved

Recent enforcement actions

State action · SOX Jan 2021
State action · SOX Feb 2018
State action · SOX Apr 2014
State action · SOX Feb 2014
State action · SOX Jan 2013
State action · SOX Jan 2013
State action · SOX Dec 2012
State action · SOX Dec 2012

This profile is built from EPA public records for system OR4100461 — 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.