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Water system · PWSID OR4100587

ONTARIO, CITY OF

ONTARIO, OR · ~14,465 people served

Check your exact address → ONTARIO overview
100
Excellent
PurityRadar safety score

PWSID

OR4100587

State

Oregon

City

ONTARIO

Population served

14,465

Primary source

Surface water

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 Feb 2025). Levels in parts per trillion (ppt).

Lithium

34,900 ppt

limit —

No federal limit

Violations & enforcement

99

Violations on record

0

Unaddressed

1

Health-based

97

Enforcement actions

From EPA ECHO (SDWIS), most recent enforcement May 2023. Official EPA record →

Monitoring & reporting · EPA contaminant 0200 began Mar 2023 Resolved
Monitoring & reporting · EPA contaminant 0200 began Mar 2023 Resolved
Monitoring & reporting · EPA contaminant 0200 began Mar 2023 Resolved
Monitoring & reporting · EPA contaminant 0300 began Mar 2023 Resolved
Monitoring & reporting · EPA contaminant 0200 began Mar 2023 Resolved
Monitoring & reporting · EPA contaminant 0300 began Mar 2023 Resolved
Monitoring · Lead & Copper Rule began Jan 2023 Resolved
Monitoring & reporting · Total trihalomethanes (TTHM) began Jul 2015 Resolved
Monitoring & reporting · Haloacetic acids (HAA5) began Jul 2015 Resolved
Monitoring & reporting · EPA contaminant 0200 began Aug 2014 Resolved
Monitoring & reporting · EPA contaminant 0300 began Aug 2014 Resolved
Monitoring & reporting · EPA contaminant 0200 began Aug 2014 Resolved

Recent enforcement actions

  • State action · SOX May 2023
  • State action · SOX Feb 2023
  • State action · SIF Jan 2016
  • State action · SIF Jan 2016
  • State action · SOX Oct 2015
  • State action · SOX Oct 2014
  • State action · SOX Sep 2013
  • State action · SOX Mar 2012

This profile is built from EPA public records for system OR4100587 — 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.