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Water system · PWSID OR4100174

KNOLL TERRACE PARK

CORVALLIS, OR · ~452 people served

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

PWSID

OR4100174

State

Oregon

City

CORVALLIS

Population served

452

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

68

Violations on record

0

Unaddressed

1

Health-based

36

Enforcement actions

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

Other · EPA contaminant 7000 began Jul 2025 Resolved
Treatment technique · EPA contaminant 5200 health-based began Oct 2024 Resolved
Monitoring & reporting · Nitrate began Jan 2024 Resolved
Other · EPA contaminant 7000 began Jul 2023 Resolved
Monitoring · Lead & Copper Rule began May 2018 Resolved
Monitoring & reporting · EPA contaminant 3028 began Jan 2012 Resolved
Monitoring & reporting · EPA contaminant 3028 began Jan 2012 Resolved
Monitoring & reporting · Haloacetic acids (HAA5) began Jan 2005 Resolved
Monitoring & reporting · Lead & Copper Rule began Jan 2005 Resolved
Monitoring & reporting · Total trihalomethanes (TTHM) began Jan 2005 Resolved
Other · EPA contaminant 7000 began Oct 2004 Resolved
Other · EPA contaminant 7000 began Jul 2004 Resolved

Recent enforcement actions

  • State action · SIF Aug 2025
  • State action · SOX Jul 2025
  • State action · SOX Mar 2025
  • State action · SOX Feb 2025
  • State action · SOX Feb 2025
  • State action · SIF Nov 2024
  • State action · SOX Aug 2023
  • State action · SIF Aug 2023

This profile is built from EPA public records for system OR4100174 — 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.