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Water system · PWSID MT0002743

ROSEMARYS ADDITION

HELENA, MT · ~30 people served

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

PWSID

MT0002743

State

Montana

City

HELENA

Population served

30

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

38

Violations on record

0

Unaddressed

0

Health-based

27

Enforcement actions

From EPA ECHO (SDWIS), most recent enforcement Oct 2014. Official EPA record →

Monitoring & reporting · Lead & Copper Rule began Oct 2014 Resolved
Monitoring & reporting · Thallium began Jan 2012 Resolved
Other · EPA contaminant 7000 began Feb 2007 Resolved
Monitoring & reporting · Lead & Copper Rule began Oct 2004 Resolved
Monitoring & reporting · Chlorite began Jan 2002 Resolved
Monitoring & reporting · EPA contaminant 1075 began Jan 2002 Resolved
Monitoring & reporting · Beryllium began Jan 2002 Resolved
Monitoring & reporting · EPA contaminant 2040 began Jan 2002 Resolved
Monitoring & reporting · EPA contaminant 1036 began Jan 2002 Resolved
Monitoring & reporting · EPA contaminant 2041 began Jan 2002 Resolved
Monitoring & reporting · EPA contaminant 2031 began Jan 2002 Resolved
Monitoring & reporting · EPA contaminant 1085 began Jan 2002 Resolved

Recent enforcement actions

  • State action · SIE Oct 2014
  • State action · SIA Oct 2014
  • State action · SOX Oct 2014
  • State action · SOX Jan 2013
  • State action · SIE Jan 2013
  • State action · SIA Jan 2013
  • State action · SOX May 2009
  • State action · SOX May 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

Arsenic

1 station · latest Jun 2021

0.009 · max 0.009 mg/L · 1

Copper

1 station · latest Jun 2021

0.006 · max 0.006 mg/L · 1

Fluoride

1 station · latest Jun 2021

0.249 · max 0.249 mg/L · 1

Lead

1 station · latest Jun 2021

0.0028 · max 0.0028 mg/L · 1

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 MT0002743 — 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.