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Wilsall, MT Tap Water Quality 2026

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

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

Main Utility: Wilsall Water District PWSID: MT0000362 Updated: 2026 Q2
✅

No federal limits exceeded on record

Lead is 2.00 ppb, 13% of the action level and no violations are open. PFAS has never been sampled at this system.

C

Wilsall earns a C for water quality

Graded on violations and lead, with state inspection findings. PFAS not tested.

Lead: 2.00 ppb — 13% of the federal action level
PFAS never sampled at this system
6 violations since 2015, 4 health-based
No violations currently open
Wilsall's lead level vs. all Montana community water systems
0 ppb5 ppb10 ppb15 ppb
Lead level: 2.00 ppb — 13% of the federal action level
✓ Lower lead than 67% of Montana utilities
Population Served
197
~130 connections
Water Source
Surface water
Groundwater under the direct influence of surface water — SDWIS source code GU
Active Violations
0
6 since 2015, all resolved

Lead & Copper Testing

Lead (Pb)
90th percentile of tap samples collected across the distribution system
13% of EPA action level
2.00 ppb
Action level: 15 ppb
Copper (Cu)
90th percentile of tap samples. SDWIS reports a copper figure only when a system exceeds the action level, so any value here is an exceedance.
207.7% of EPA action level
2,700 ppb
Action level: 1,300 ppb
The 90th-percentile lead result is 2.00 ppb, 13% of the 15 ppb federal action level. The action level is a treatment trigger, not a legal maximum, and it is measured across sampled taps rather than at any single home. Copper reached the action level here; a copper figure appears in SDWIS only when a system triggers it.

Contaminant Violations (2015–Present)

ContaminantTypeMeasuredLimitPeriodStatus
Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2025 Resolved
Surface Water Treatment Rule MONITORING AND REPORTING — — 2025 Resolved
Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2025 Resolved
Surface Water Treatment Rule MONITORING AND REPORTING — — 2025 Resolved
Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2019 Addressed
Nitrate-Nitrite MCL EXCEEDANCE 10.6 MG/L — 2018 Resolved
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

6 violations are on record since 2015, of which 4 were health-based. All have been resolved and none remain open.

About the Main Water System

Utility Wilsall Water District
PWSID MT0000362
Water source Surface water — Groundwater under the direct influence of surface water — SDWIS source code GU
Population served 197
Service connections 130
Systems serving this area 1
Regulator State primacy agency
Data through 2026 Q2 — EPA SDWIS

Frequently Asked Questions

Is Wilsall tap water safe to drink? ▼
No federal limit is exceeded on record. No violations are currently open. Lead is 2.00 ppb, 13% of the action level.
Does Wilsall 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 Wilsall? ▼
Wilsall Water District (PWSID MT0000362). Surface water. Groundwater under the direct influence of surface water — SDWIS source code GU
When was this system last inspected? ▼
It was last inspected on 2023-10-30. No significant deficiencies were recorded.

What Should Wilsall 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.

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