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Water system · PWSID OR4100306

SOUTH HILLS WATER SYSTEM

HILLSBORO, OR · ~250 people served

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

PWSID

OR4100306

State

Oregon

City

HILLSBORO

Population served

250

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

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

10

Violations on record

0

Unaddressed

1

Health-based

10

Enforcement actions

From EPA ECHO (SDWIS), most recent enforcement Sep 2020. Official EPA record →

Monitoring & reporting · Haloacetic acids (HAA5) began Oct 2016 Resolved
Monitoring & reporting · Total trihalomethanes (TTHM) began Oct 2016 Resolved
Monitoring & reporting · Haloacetic acids (HAA5) began Jan 2008 Resolved
Monitoring & reporting · Total trihalomethanes (TTHM) began Jan 2008 Resolved
Monitoring & reporting · Arsenic began Jan 2005 Resolved
Monitoring & reporting · Total coliform began Jan 1999 Resolved
Monitoring & reporting · Total coliform began Jun 1996 Resolved
Monitoring & reporting · Total coliform began Aug 1992 Resolved
Max contaminant level (MCL) · Total coliform health-based began Jul 1991 Resolved
Monitoring & reporting · Total coliform began Apr 1991 Resolved

Recent enforcement actions

  • State action · SOX Sep 2020
  • State action · SOX Oct 2011
  • State action · SIA Feb 2011
  • State action · SOX Jul 2008
  • State action · SOX Jul 2001
  • State action · SOX Jul 2001
  • State action · SOX Jul 2001
  • State action · SOX Jul 2001

This profile is built from EPA public records for system OR4100306 — 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.