PlainWater
States → Montana

Community Water System · PWS MT0000199

Denton Town Of

Denton, Montana 59430 - drinking water served from surface water sources to 255 people, tracked in EPA SDWIS and UCMR5.

255
People served
392
EPA violations
343
Health-based
Untested
UCMR5 result

The verdict

EPA records 392 drinking-water violations at Denton Town Of, 88% of them health-based - above the Montana per-system average.

392
Total EPA violations on record
88%
Health-based (MCL / treatment failure)
255
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Denton Town Of

Denton Town Of is a local-owned community water system that delivers drinking water to 255 residents in Denton, Montana (Fergus County) through 169 service connections. Its water is drawn from surface water sources. EPA's Safe Drinking Water Information System records 392 total violations for this system , of which 343 (88%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 32 monitoring and reporting violations are on file. The most recent violation on record dates to 2025.

The most frequently cited contaminant at this system is Long Term 2 Enhanced Surface Water Treatment Rule, recorded in 232 violations (TT, health-based). This system has not yet been sampled under EPA's UCMR5 PFAS monitoring program, so no PFAS detection data is available here.

Across Montana, EPA tracks 2,263 public water systems serving 1,112,267 people, with 297,270 cumulative violations and 25,922 health-based violations on record. About 95% of systems in the state carry at least one violation, and state-wide the average per system is 131.4 violations. Statewide, 28 of 45 UCMR5-tested systems have reported PFAS detections (62.2%).

Denton Town Of's 392 violations sit above the Montana average.

All figures above are sourced directly from EPA SDWIS and UCMR5 public data releases and are updated as EPA publishes new reporting cycles.

Population Served
255
Total Violations
392
Health-Based Violations
343
Water Source
Surface Water

System Details

System Type
Community
Owner Type
Local
Connections
169
County
Fergus
School/Daycare
No
MCL Violations
46
Monitoring Violations
32
Treatment Tech Violations
297

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Long Term 2 Enhanced Surface Water Treatment Rule TT 232 2024
Surface Water Treatment Rule TT 57 2025
Nitrate-Nitrite MCL 43 2016
Consumer Confidence Rule Other 14 2022
Groundwater Rule TT 8 2011
Nitrate-Nitrite MR 6 2018
Revised Total Coliform Rule MON 6 2021
Nitrate MCL 3 1987
Mercury MR 3 1999
Cadmium MR 3 1999
Chromium MR 3 1999
Barium MR 3 1999
Selenium MR 3 1999
Fluoride MR 3 1999
Lead and Copper Rule MR 2 2014

Verify This Water System

The figures above are aggregated from EPA's public databases. To verify the underlying records, or to file a complaint, request a Consumer Confidence Report, or check current monitoring status, go directly to the federal and state regulators that enforce the Safe Drinking Water Act for Denton Town Of.

Federal Source of Truth

EPA SDWIS, Federal Reports

EPA's Safe Drinking Water Information System (SDWIS) holds the federal compliance record for every regulated public water system. Open the system-level report by PWS ID:

View PWS ID MT0000199 on SDWIS

Source: EPA SDWIS Federal Reports Search

State Regulator

Montana Drinking Water Authority

Montana's primacy agency administers the Safe Drinking Water Act locally. Search EPA SDWIS for the current state contact, or use the state's public health or environment department portal.

Find MT regulator via EPA SDWIS

Violation Timeline

Each row links to the EPA SDWIS public record for verification. Cross-reference the contaminant code on EPA's federal report to see violation dates, return-to-compliance status, and enforcement actions.

Year (latest) Contaminant Category Count EPA Record
2025 Surface Water Treatment Rule TT 57 SDWIS / MT0000199 / 0200
2024 Long Term 2 Enhanced Surface Water Treatment Rule TT 232 SDWIS / MT0000199 / 0800
2022 Consumer Confidence Rule Other 14 SDWIS / MT0000199 / 7000
2021 Revised Total Coliform Rule MON 6 SDWIS / MT0000199 / 8000
2018 Nitrate-Nitrite MR 6 SDWIS / MT0000199 / 1038
2016 Nitrate-Nitrite MCL 43 SDWIS / MT0000199 / 1038
2014 Lead and Copper Rule MR 2 SDWIS / MT0000199 / 5000
2011 Groundwater Rule TT 8 SDWIS / MT0000199 / 0700
1999 Mercury MR 3 SDWIS / MT0000199 / 1035
1999 Cadmium MR 3 SDWIS / MT0000199 / 1015
1999 Chromium MR 3 SDWIS / MT0000199 / 1020
1999 Barium MR 3 SDWIS / MT0000199 / 1010
1999 Selenium MR 3 SDWIS / MT0000199 / 1045
1999 Fluoride MR 3 SDWIS / MT0000199 / 1025
1987 Nitrate MCL 3 SDWIS / MT0000199 / 1040

How Denton Town Of Compares

Cross-reference this system's record against state averages and the federal MCL framework for context.

Metric Denton Town Of Montana avg Federal benchmark
Total violations 392 131.4 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 343 11.5 Indicates a contaminant exceeded a federal MCL
PFAS detection None 62.2% EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 255 492 Sizing context for compliance burden

Sources: EPA SDWIS and EPA National Primary Drinking Water Regulations (40 CFR Part 141). State averages computed across 2,263 regulated public water systems in Montana.

Federal MCL reference, Safe Drinking Water Act thresholds ▼
Contaminant Federal MCL / Action Level Note
Lead 0 mg/L (Action Level: 0.015 mg/L) Lead and Copper Rule treatment technique
Arsenic 0.010 mg/L (10 ppb) Health-based MCL since 2006
Total Coliform Treatment technique (RTCR) Indicator organism, monitoring trigger
PFOA / PFOS (PFAS) 4.0 ppt each (final 2024 rule) Compliance deadline 2029 (EPA proposed extending to 2031, not yet final as of May 2026)
Nitrate (as N) 10 mg/L Acute health risk for infants

Frequently Asked Questions

Is Denton Town Of water safe to drink? ▼
Denton Town Of (PWS ID: MT0000199) has 392 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 255 people using Surface Water sources.
How many people does Denton Town Of serve? ▼
Denton Town Of serves 255 people in Denton, Montana. It is a Local-owned system using Surface Water water sources with 169 service connections.
What type of violations does Denton Town Of have? ▼
Denton Town Of has 392 total violations: 343 health-based violations (MCL exceedances or treatment failures), 32 monitoring/reporting violations, and 297 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Denton Town Of water? ▼
No PFAS testing data is available for Denton Town Of under the EPA's UCMR5 monitoring program.
What water source does Denton Town Of use? ▼
Denton Town Of uses Surface Water as its primary water source. It is classified as a Community Water System (CWS), serving residential populations year-round.
Where does this data come from? ▼
All data comes from the EPA Safe Drinking Water Information System (SDWIS) and the UCMR5 PFAS monitoring program. SDWIS tracks compliance for all public water systems regulated under the Safe Drinking Water Act.
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025. This data is provided for informational purposes only.

Read our methodology - how this data is sourced, computed, and verified.

Data sourced from EPA SDWIS and UCMR5 PFAS monitoring data. See our methodology for details. Retrieved and formatted by PlainWater Editorial

Every figure on PlainWater is rendered directly from EPA SDWIS drinking-water data, no number is typed in by an editor. This system's figures are rendered directly from EPA SDWIS data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.