PlainWater
States → Montana

Community Water System · PWS MT0000208

Ennis Town Of

Ennis, Montana 59729 - drinking water served from groundwater sources to 1,400 people, tracked in EPA SDWIS and UCMR5.

1,400
People served
175
EPA violations
3
Health-based
Untested
UCMR5 result

The verdict

EPA records 175 drinking-water violations at Ennis Town Of, 2% of them health-based - above the Montana per-system average.

175
Total EPA violations on record
2%
Health-based (MCL / treatment failure)
1,400
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Ennis Town Of

Ennis Town Of is a local-owned community water system that delivers drinking water to 1,400 residents in Ennis, Montana (Madison County) through 757 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 175 total violations for this system , of which 3 (2%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 168 monitoring and reporting violations are on file. The most recent violation on record dates to 2023.

The most frequently cited contaminant at this system is Coliform (TCR), recorded in 14 violations (MR). 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%).

Ennis Town Of's 175 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
1,400
Total Violations
175
Health-Based Violations
3
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Local
Connections
757
County
Madison
School/Daycare
No
MCL Violations
3
Monitoring Violations
168
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Coliform (TCR) MR 14 2008
Lead and Copper Rule MR 9 2023
BHC-GAMMA MR 6 2018
Dalapon MR 6 2018
Toxaphene MR 6 2018
Di(2-ethylhexyl) adipate MR 6 2018
OXAMYL MR 6 2018
Dinoseb MR 6 2018
Hexachlorocyclopentadiene MR 6 2018
Carbofuran MR 6 2018
Atrazine MR 6 2018
LASSO MR 6 2018
Heptachlor MR 6 2018
Heptachlor epoxide MR 6 2018
2,4-D MR 6 2018
2,4,5-TP MR 6 2018
Benzo(a)pyrene MR 6 2018
Chlordane MR 6 2018
Methoxychlor MR 6 2018
Picloram MR 6 2018
Pentachlorophenol MR 6 2018
Simazine MR 6 2018
Di(2-ethylhexyl) phthalate MR 6 2018
Endrin MR 6 2018
HEXACHLOROBENZENE MR 6 2018
Coliform (TCR) MCL 3 1994
Gross Alpha, Excl. Radon and U MR 3 2018
Combined Radium (-226 and -228) MR 3 2018
Nitrate MR 1 1998

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 Ennis 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 MT0000208 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
2023 Lead and Copper Rule MR 9 SDWIS / MT0000208 / 5000
2018 BHC-GAMMA MR 6 SDWIS / MT0000208 / 2010
2018 Dalapon MR 6 SDWIS / MT0000208 / 2031
2018 Toxaphene MR 6 SDWIS / MT0000208 / 2020
2018 Di(2-ethylhexyl) adipate MR 6 SDWIS / MT0000208 / 2035
2018 OXAMYL MR 6 SDWIS / MT0000208 / 2036
2018 Dinoseb MR 6 SDWIS / MT0000208 / 2041
2018 Hexachlorocyclopentadiene MR 6 SDWIS / MT0000208 / 2042
2018 Carbofuran MR 6 SDWIS / MT0000208 / 2046
2018 Atrazine MR 6 SDWIS / MT0000208 / 2050
2018 LASSO MR 6 SDWIS / MT0000208 / 2051
2018 Heptachlor MR 6 SDWIS / MT0000208 / 2065
2018 Heptachlor epoxide MR 6 SDWIS / MT0000208 / 2067
2018 2,4-D MR 6 SDWIS / MT0000208 / 2105
2018 2,4,5-TP MR 6 SDWIS / MT0000208 / 2110

How Ennis Town Of Compares

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

Metric Ennis Town Of Montana avg Federal benchmark
Total violations 175 131.4 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 3 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 1,400 492 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 Ennis Town Of water safe to drink? ▼
Ennis Town Of (PWS ID: MT0000208) has 175 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 1,400 people using Groundwater sources.
How many people does Ennis Town Of serve? ▼
Ennis Town Of serves 1,400 people in Ennis, Montana. It is a Local-owned system using Groundwater water sources with 757 service connections.
What type of violations does Ennis Town Of have? ▼
Ennis Town Of has 175 total violations: 3 health-based violations (MCL exceedances or treatment failures), 168 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Ennis Town Of water? ▼
No PFAS testing data is available for Ennis Town Of under the EPA's UCMR5 monitoring program.
What water source does Ennis Town Of use? ▼
Ennis Town Of uses Groundwater 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.