HILLSBORO, CITY OF

HILLSBORO, OR · ~92,632 people served

Check your exact address → HILLSBORO overview

100

Excellent

PurityRadar safety score

PWSID

OR4101513

State

Oregon

City

HILLSBORO

Population served

92,632

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

Violations on record

Unaddressed

Health-based

Enforcement actions

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

Other · EPA contaminant 7000 began Jul 2025 Resolved

Monitoring · Lead & Copper Rule began Jun 2016 Resolved

Monitoring & reporting · Total coliform began Apr 2010 Resolved

Monitoring & reporting · Total trihalomethanes (TTHM) began Jul 2009 Resolved

Monitoring & reporting · Haloacetic acids (HAA5) began Jul 2009 Resolved

Recent enforcement actions

State action · SOX Jul 2025
State action · SOX Jul 2016
State action · SIF Jun 2011
State action · SOX Jun 2010
State action · SIA May 2010
State action · SOX Jan 2010
State action · SOX Jan 2010
State action · SIA Dec 2009

Area water-quality monitoring

Environmental monitoring (rivers, wells, intakes) recorded in this system’s service area in the EPA/USGS Water Quality Portal since 2018 — source/ambient water, not finished tap water. Context for the watershed, not a reading from your tap.

ContaminantMedian · max · samples

Nitrate

6 stations · latest Dec 2022

0.35 · max 3.17 mg/l as N · 709

Manganese

5 stations · latest Oct 2022

110 · max 580 ug/l · 149

Arsenic

5 stations · latest Oct 2022

1.35 · max 12 ug/l · 136

Lead

5 stations · latest Oct 2022

0.2 · max 3.2 ug/l · 69

Source: Water Quality Portal (EPA/USGS/state agencies). Values are as-reported and aren’t health thresholds.

This profile is built from EPA public records for system OR4101513 — 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.