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Sweet Grass, MT Tap Water Quality 2026

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

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

Main Utility: Sweetgrass Water Users Assn PWSID: MT0000340 Updated: 2026 Q2
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Lead above the federal action level

Lead is 15.00 ppb, 100% of the action level and no violations are open. PFAS has never been sampled at this system.

D

Sweet Grass earns a D for water quality

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

Lead: 15.00 ppb — 100% of the federal action level
PFAS never sampled at this system
22 violations since 2015, 2 health-based
No violations currently open
Sweet Grass's lead level vs. all Montana community water systems
0 ppb5 ppb10 ppb15 ppb
Lead level: 15.00 ppb — 100% of the federal action level
✓ Lower lead than 5% of Montana utilities
Population Served
58
~97 connections
Water Source
Surface water
Purchased from another system — SDWIS source code SWP
Active Violations
0
22 since 2015, all resolved

Lead & Copper Testing

Lead (Pb)
90th percentile of tap samples collected across the distribution system
100% of EPA action level
15.00 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.
114.6% of EPA action level
1,490 ppb
Action level: 1,300 ppb
The 90th-percentile lead result is 15.00 ppb, 100% 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
TTHM MONITORING AND REPORTING — 0.080 mg/L 2026 Archived
Total Haloacetic Acids (HAA5) MONITORING AND REPORTING — 0.060 mg/L 2026 Archived
TTHM MCL EXCEEDANCE 0.083 MG/L 0.080 mg/L 2025 Resolved
Lead and Copper Rule MONITORING AND REPORTING — TT 2024 Unaddressed
Surface Water Treatment Rule MONITORING AND REPORTING — — 2024 Resolved
TTHM MONITORING AND REPORTING — 0.080 mg/L 2024 Resolved
Total Haloacetic Acids (HAA5) MONITORING AND REPORTING — 0.060 mg/L 2024 Resolved
TTHM MONITORING AND REPORTING — 0.080 mg/L 2022 Resolved
Total Haloacetic Acids (HAA5) MONITORING AND REPORTING — 0.060 mg/L 2022 Resolved
TTHM MONITORING AND REPORTING — 0.080 mg/L 2022 Resolved
Total Haloacetic Acids (HAA5) MONITORING AND REPORTING — 0.060 mg/L 2022 Resolved
Lead and Copper Rule MONITORING AND REPORTING — TT 2021 Resolved
TTHM MONITORING AND REPORTING — 0.080 mg/L 2021 Resolved
Total Haloacetic Acids (HAA5) MONITORING AND REPORTING — 0.060 mg/L 2021 Resolved
TTHM MONITORING AND REPORTING — 0.080 mg/L 2020 Resolved
Total Haloacetic Acids (HAA5) MONITORING AND REPORTING — 0.060 mg/L 2020 Resolved
Revised Total Coliform Rule MONITORING FAILURE — — 2017 Resolved
Coliform (TCR) MONITORING AND REPORTING — 5% of samples 2015 Resolved
TTHM MCL EXCEEDANCE 87 UG/L 0.080 mg/L 2015 Resolved
Coliform (TCR) MONITORING AND REPORTING — 5% of samples 2015 Resolved
TTHM MONITORING AND REPORTING — 0.080 mg/L 2015 Resolved
Total Haloacetic Acids (HAA5) MONITORING AND REPORTING — 0.060 mg/L 2015 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

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

About the Main Water System

Utility Sweetgrass Water Users Assn
PWSID MT0000340
Water source Surface water — Purchased from another system — SDWIS source code SWP
Population served 58
Service connections 97
Systems serving this area 1
Regulator State primacy agency
Data through 2026 Q2 — EPA SDWIS

Frequently Asked Questions

Is Sweet Grass tap water safe to drink? ▼
No federal limit is exceeded on record. No violations are currently open. Lead is 15.00 ppb, 100% of the action level.
Does Sweet Grass 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 Sweet Grass? ▼
Sweetgrass Water Users Assn (PWSID MT0000340). Surface water. Purchased from another system — SDWIS source code SWP
When was this system last inspected? ▼
It was last inspected on 2025-12-18. No significant deficiencies were recorded.

What Should Sweet Grass Residents Do?

1
Consider a filter certified for lead
Look for NSF/ANSI 53 certification for lead reduction.
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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