CENTENNIAL HOMEOWNER'S ASSOCIATION, INC

CORVALLIS, MT · ~115 people served

Check your exact address → CORVALLIS overview

100

Excellent

PurityRadar safety score

PWSID

MT0004438

State

Montana

City

CORVALLIS

Population served

115

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

Violations on record

Unaddressed

Health-based

Enforcement actions

From EPA ECHO (SDWIS), most recent enforcement Dec 2010. Official EPA record →

Max contaminant level (MCL) · Total coliform health-based began Nov 2010 Resolved

Max contaminant level (MCL) · Total coliform health-based began Aug 2010 Resolved

Max contaminant level (MCL) · Total coliform health-based began Oct 2008 Resolved

Monitoring & reporting · Total coliform began Nov 2007 Resolved

Monitoring & reporting · Gross alpha began Jul 2007 Resolved

Monitoring & reporting · Uranium began Jul 2007 Resolved

Recent enforcement actions

State action · SOX Dec 2010
State action · SIF Nov 2010
State action · SIA Nov 2010
State action · SIE Nov 2010
State action · SIA Nov 2010
State action · SOX Sep 2010
State action · SIA Aug 2010
State action · SIE Aug 2010

This profile is built from EPA public records for system MT0004438 — 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.