EUREKA TOWN OF

EUREKA, MT · ~1,995 people served

Check your exact address → EUREKA overview

100

Excellent

PurityRadar safety score

PWSID

MT0000210

State

Montana

City

EUREKA

Population served

1,995

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

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 Jan 2018. Official EPA record →

Monitoring & reporting · Lead & Copper Rule began Jan 2017 Resolved

Treatment technique · EPA contaminant 0200 health-based began Aug 2011 Resolved

Max contaminant level (MCL) · Total coliform health-based began Mar 2009 Resolved

Monitoring & reporting · Haloacetic acids (HAA5) began Jan 2007 Resolved

Monitoring & reporting · Total trihalomethanes (TTHM) began Jan 2007 Resolved

Treatment technique · Lead & Copper Rule health-based began Oct 2006 Resolved

Monitoring & reporting · Lead & Copper Rule began Jul 2004 Resolved

Monitoring & reporting · Lead & Copper Rule began Jan 2004 Resolved

Monitoring & reporting · Lead & Copper Rule began Jul 2003 Resolved

Monitoring & reporting · Arsenic began Jan 2003 Resolved

Monitoring & reporting · Lead & Copper Rule began Jan 2003 Resolved

Recent enforcement actions

State action · SOX Jan 2018
State action · SIA Jul 2017
State action · SIE Jul 2017
State action · SOX Jun 2017
State action · SFL Mar 2012
State action · SO8 Aug 2011
State action · SIA Aug 2011
State action · SIE Aug 2011

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

1 station · latest Jul 2023

0.072 · max 0.108 mg/l as N · 16

Manganese

1 station · latest Nov 2023

5.57 · max 5.7 ug/l · 2

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 MT0000210 — 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.