States ›Montana ›Fergus County ›Denton

Denton, MT Tap Water Quality 2026

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

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

Main Utility: Denton Town Of PWSID: MT0000199 Updated: 2026 Q2
✅

No federal limits exceeded on record

Lead is 4.00 ppb, 27% of the action level and no violations are open. PFAS has never been sampled at this system.

B

Denton earns a B for water quality

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

Lead: 4.00 ppb — 27% of the federal action level
PFAS never sampled at this system
88 violations since 2015, 76 health-based
No violations currently open
Denton's lead level vs. all Montana community water systems
0 ppb5 ppb10 ppb15 ppb
Lead level: 4.00 ppb — 27% of the federal action level
✓ Lower lead than 26% of Montana utilities
Population Served
172
~169 connections
Water Source
Surface water
Drawn from surface water — SDWIS source code SW
Active Violations
0
88 since 2015, all resolved

Lead & Copper Testing

Lead (Pb)
90th percentile of tap samples collected across the distribution system
27% of EPA action level
4.00 ppb
Action level: 15 ppb
The 90th-percentile lead result is 4.00 ppb, 27% 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.

Contaminant Violations (2015–Present)

ContaminantTypeMeasuredLimitPeriodStatus
Surface Water Treatment Rule MONITORING AND REPORTING — — 2026 Archived
Surface Water Treatment Rule MONITORING AND REPORTING — — 2026 Archived
Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2026 Archived
Surface Water Treatment Rule MONITORING AND REPORTING — — 2026 Archived
Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2026 Archived
Surface Water Treatment Rule MONITORING AND REPORTING — — 2025 Archived
Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2025 Archived
Surface Water Treatment Rule MONITORING AND REPORTING — — 2025 Archived
Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2025 Archived
Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2025 Archived
Surface Water Treatment Rule MONITORING AND REPORTING — — 2025 Archived
Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2025 Archived
Surface Water Treatment Rule MONITORING AND REPORTING — — 2025 Archived
Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2025 Archived
Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2025 Archived
Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2025 Archived
Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2025 Archived
Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2025 Archived
Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2025 Archived
Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2025 Archived
Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2025 Archived
Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2024 Archived
Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2024 Archived
Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2024 Archived
Long Term 2 Enhanced Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2024 Archived
Long Term 2 Enhanced Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2024 Archived
Long Term 2 Enhanced Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2024 Archived
Long Term 2 Enhanced Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2024 Archived
Long Term 2 Enhanced Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2024 Archived
Long Term 2 Enhanced Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2024 Archived
Long Term 2 Enhanced Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2024 Archived
Long Term 2 Enhanced Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2024 Archived
Long Term 2 Enhanced Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2024 Archived
Long Term 2 Enhanced Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2023 Archived
Long Term 2 Enhanced Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2023 Archived
Long Term 2 Enhanced Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2023 Archived
Long Term 2 Enhanced Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2023 Archived
Long Term 2 Enhanced Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2023 Archived
Long Term 2 Enhanced Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2023 Archived
Long Term 2 Enhanced Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2023 Archived
Long Term 2 Enhanced Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2023 Archived
Long Term 2 Enhanced Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2023 Archived
Long Term 2 Enhanced Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2023 Archived
Long Term 2 Enhanced Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2023 Archived
Long Term 2 Enhanced Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2023 Archived
Long Term 2 Enhanced Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2022 Archived
Long Term 2 Enhanced Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2022 Archived
Long Term 2 Enhanced Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2022 Archived
Long Term 2 Enhanced Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2022 Archived
Long Term 2 Enhanced Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2022 Archived
Consumer Confidence Rule OTHER — — 2022 Resolved
Long Term 2 Enhanced Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2022 Archived
Long Term 2 Enhanced Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2022 Archived
Long Term 2 Enhanced Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2022 Archived
Long Term 2 Enhanced Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2022 Archived
Long Term 2 Enhanced Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2022 Archived
Long Term 2 Enhanced Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2022 Archived
Long Term 2 Enhanced Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2022 Archived
Long Term 2 Enhanced Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2021 Archived
Long Term 2 Enhanced Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2021 Archived
Long Term 2 Enhanced Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2021 Archived
Long Term 2 Enhanced Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2021 Archived
Long Term 2 Enhanced Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2021 Archived
Consumer Confidence Rule OTHER — — 2021 Resolved
Long Term 2 Enhanced Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2021 Archived
Revised Total Coliform Rule MONITORING FAILURE — — 2021 Resolved
Long Term 2 Enhanced Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2021 Archived
Long Term 2 Enhanced Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2021 Archived
Long Term 2 Enhanced Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2021 Archived
Long Term 2 Enhanced Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2021 Archived
Long Term 2 Enhanced Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2021 Archived
Long Term 2 Enhanced Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2021 Archived
Long Term 2 Enhanced Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2020 Archived
Long Term 2 Enhanced Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2020 Archived
Long Term 2 Enhanced Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2020 Archived
Long Term 2 Enhanced Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2020 Archived
Long Term 2 Enhanced Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2020 Archived
Long Term 2 Enhanced Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2020 Archived
Long Term 2 Enhanced Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2020 Archived
Long Term 2 Enhanced Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2020 Archived
Long Term 2 Enhanced Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2020 Archived
Long Term 2 Enhanced Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2020 Archived
Long Term 2 Enhanced Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2020 Archived
Long Term 2 Enhanced Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2020 Archived
Long Term 2 Enhanced Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2019 Archived
Nitrate-Nitrite MONITORING AND REPORTING — — 2018 Resolved
Revised Total Coliform Rule MONITORING FAILURE — — 2017 Resolved
Nitrate-Nitrite MCL EXCEEDANCE 19.4 MG/L — 2016 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

88 violations are on record since 2015, of which 76 were health-based. All have been resolved and none remain open.

About the Main Water System

Utility Denton Town Of
PWSID MT0000199
Water source Surface water — Drawn from surface water — SDWIS source code SW
Population served 172
Service connections 169
Systems serving this area 1
Regulator State primacy agency
Data through 2026 Q2 — EPA SDWIS

Frequently Asked Questions

Is Denton tap water safe to drink? ▼
No federal limit is exceeded on record. No violations are currently open. Lead is 4.00 ppb, 27% of the action level.
Does Denton 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 Denton? ▼
Denton Town Of (PWSID MT0000199). Surface water. Drawn from surface water — SDWIS source code SW
When was this system last inspected? ▼
It was last inspected on 2023-11-13. No significant deficiencies were recorded.

What Should Denton 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

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