States ›Montana ›Lewis and Clark County ›Unionville

Unionville, MT Tap Water Quality 2026

Water quality report for Unionville, MT — PFAS, lead and copper results, violation history and state inspection findings from EPA SDWIS.

A look at Unionville's drinking water using EPA enforcement records: violations, lead and copper results, PFAS sampling and state inspection findings.

Main Utility: Ncmrwa Pondera Co Service Area PWSID: MT0004834 Updated: 2026 Q2
✅

No federal limits exceeded on record

Lead has not been reported for this system and no violations are open. PFAS has never been sampled at this system.

B

Unionville earns a B for water quality

Graded on violations alone, with state inspection findings. PFAS not tested. Lead not reported.

Lead: not reported
PFAS never sampled at this system
2 violations since 2015, 0 health-based
No violations currently open
Unionville's lead level vs. all Montana community water systems
0 ppb5 ppb10 ppb15 ppb
Lead level: — 0% of the federal action level
✓ Lower lead than % of Montana utilities
Population Served
~1 connections
Water Source
Surface water
Purchased from another system — SDWIS source code SWP
Active Violations
0
2 since 2015, all resolved

Lead & Copper Testing

Lead (Pb)
90th percentile of tap samples collected across the distribution system
0% of EPA action level
Action level: 15 ppb
No lead result has been reported for this system in the current window. That is a gap in state reporting, not a finding of safety.

Contaminant Violations (2015–Present)

ContaminantTypeMeasuredLimitPeriodStatus
TTHM MONITORING AND REPORTING — 0.080 mg/L 2025 Archived
Total Haloacetic Acids (HAA5) MONITORING AND REPORTING — 0.060 mg/L 2025 Archived
Understanding violation types MCL violations mean a contaminant exceeded the federal maximum limit — the most serious type.
TT (Treatment Technique) violations mean required treatment procedures weren't followed, but don't necessarily mean contamination occurred.

Violation History

2 violations are on record since 2015, of which 0 were health-based. All have been resolved and none remain open.

About the Main Water System

Utility Ncmrwa Pondera Co Service Area
PWSID MT0004834
Water source Surface water — Purchased from another system — SDWIS source code SWP
Population served
Service connections 1
Systems serving this area 1
Regulator State primacy agency
Data through 2026 Q2 — EPA SDWIS

Frequently Asked Questions

Is Unionville tap water safe to drink? ▼
No federal limit is exceeded on record. No violations are currently open.
Does Unionville water have PFAS? ▼
This system has never been sampled for PFAS. EPA's national monitoring covered systems serving 3,300 people or more, so no results exist — which is not evidence that none is present.
Who supplies water to Unionville? ▼
Ncmrwa Pondera Co Service Area (PWSID MT0004834). Surface water. Purchased from another system — SDWIS source code SWP
When was this system last inspected? ▼
It was last inspected on 2024-08-05. No significant deficiencies were recorded.

What Should Unionville Residents Do?

1
Read your annual water report
Your supplier publishes a Consumer Confidence Report each July covering the prior year.
2
Check for a lead service line
Lead reaches tap water mainly through service lines and household plumbing. Suppliers now publish an inventory identifying lead lines.
3
Flush before drinking
If water has sat in pipes more than six hours, run the cold tap for two minutes before drinking or cooking.

Nearby Cities in Montana

Helena, Mt Tap Water Quality 2026 Lewis and Clark East Helena, Mt Tap Water Quality 2026 Lewis and Clark Helena Valley Southeast, Mt Tap Water Quality 2026 Lewis and Clark Helena Valley Northwest, Mt Tap Water Quality 2026 Lewis and Clark Helena West Side, Mt Tap Water Quality 2026 Lewis and Clark Helena Valley West Central, Mt Tap Water Quality 2026 Lewis and Clark