Public water system · MT0004863
ActiveMerry Widow Health Mine Unapproved
At a glance
Merry Widow Health Mine Unapproved (PWSID MT0004863) is an active transient non-community water system in Jefferson County, Montana. It reports serving 52 people through 4 service connections. Its primary water source is groundwater, and EPA lists it as privately owned. EPA's records list 5 violations for this system; 1 is health-based, and the most recent began in November 2025.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
52
Service connections
4
Primary source
GW
Groundwater
System type
TNCWS
Transient non-community water system
System record
How does Merry Widow Health Mine Unapproved compare with other water systems in Jefferson County?
By EPA's size categories, Merry Widow Health Mine Unapproved is a very small system (500 people or fewer). Jefferson County has 41 active public water systems. Its population served is well below the county average of 241 people per system, and accounts for 0.5% of the 9,886 people reported by systems filed under the county. Across Montana, the 2,378 active systems average 489 people each. Nationally, the average active transient non-community water system reports serving 144 people, so Merry Widow Health Mine Unapproved is about 64% below that figure.
What does “transient non-community water system” mean?
A transient non-community water system serves places where people do not stay long, such as gas stations and campgrounds, and regularly serves at least 25 people a day for at least 60 days a year. Montana has 1,206 active transient non-community water systems, 51% of the state's 2,378 active systems. Groundwater means the system draws its water from wells or springs fed by underground aquifers. 1,994 Montana systems (84%) list groundwater as their primary source.
Who owns and regulates Merry Widow Health Mine Unapproved?
EPA lists Merry Widow Health Mine Unapproved as privately owned. The MT state drinking water program is its primacy agency, the regulator with primary enforcement responsibility for the system under the Safe Drinking Water Act. 30 of the 41 active systems in Jefferson County (73%) are also privately owned.
Does Merry Widow Health Mine Unapproved have drinking water violations?
EPA's records list 5 violations for this system; 1 is health-based, and the most recent began in November 2025. The violations listed here began between May 2014 and November 2025. By type: 2 monitoring and reporting, 1 required treatment not met, 1 monitoring and 1 public notice, recordkeeping or other. The contaminant or rule involved most often is Revised Total Coliform Rule (3 of them). EPA lists 4 as resolved and 1 as unaddressed. Resolved means at least one resolving action is on record: the system returned to compliance, the rule no longer applies, or no further action was needed. Unaddressed means the violation is not resolved or archived and is not yet covered by formal enforcement.
| Began | Violation | Contaminant or rule | Health-based | Status |
|---|---|---|---|---|
| 2025-11-01 | Required treatment not metTreatment Technique Startup Procedures (RTCR) · code 2D | Revised Total Coliform Rulecode 8000 | Yes | Unaddressed |
| 2018-11-01 | MonitoringMonitoring, Routine (RTCR) · code 3A | Revised Total Coliform Rulecode 8000 | No | Resolved |
| 2016-04-02 | Public notice, recordkeeping or otherSample Siting Plan Errors (RTCR) · code 5A | Revised Total Coliform Rulecode 8000 | No | Resolved |
| 2015-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Nitrate-Nitritecode 1038 | No | Resolved |
| 2014-05-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
All 5 violations in EPA's records, newest first.Labels and codes come from EPA's SDWIS reference tables. A monitoring or reporting violation means a required test or report was missed or late; it does not by itself mean a contaminant was found. "Health-based" marks violations of a legal limit or required treatment.
Merry Widow Health Mine Unapproved: frequently asked questions
Who runs Merry Widow Health Mine Unapproved?
Merry Widow Health Mine Unapproved (PWSID MT0004863) is a transient non-community water system privately owned. It is regulated by the MT state drinking water program.
How many people does Merry Widow Health Mine Unapproved serve?
Merry Widow Health Mine Unapproved reports serving 52 people through 4 service connections in Jefferson County, Montana.
Where does Merry Widow Health Mine Unapproved get its water?
EPA SDWIS lists this system's primary water source as groundwater. Groundwater means the system draws its water from wells or springs fed by underground aquifers.
Does Merry Widow Health Mine Unapproved have any drinking water violations?
EPA's records list 5 violations for this system; 1 is health-based, and the most recent began in November 2025. A monitoring or reporting violation means a required test or report was missed or late; it does not by itself mean a contaminant was found.
Is Merry Widow Health Mine Unapproved's water safe to drink?
AquaCensus shows EPA compliance records, not current water test results, so it cannot say whether the water is safe at a given moment. EPA's records list 5 violations for this system; 1 is health-based, and the most recent began in November 2025. For current results, consult EPA ECHO, or the MT state drinking water program.
Where can I find Merry Widow Health Mine Unapproved's water quality report?
The annual Consumer Confidence Report requirement applies to community water systems. Merry Widow Health Mine Unapproved is a transient non-community water system, so it is not required to publish one; like every public water system, it must notify the people it serves about violations under EPA's public notification rules.
Other water systems in Jefferson County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Whitehall Town of | Jefferson | 1,500 | Community | Groundwater |
| Boulder City of | Jefferson | 1,400 | Community | Groundwater |
| Jefferson Hills Wua | Jefferson | 780 | Community | Groundwater |
| Lewis and Clark Caverns Visitor Center | Jefferson | 615 | Transient non-community | Groundwater under influence of surface water |
| Jefferson City South Rest Stop | Jefferson | 600 | Transient non-community | Groundwater |
| Montana City School Dist 27 | Jefferson | 534 | Non-transient non-community | Groundwater |
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About this data
Source: U.S. EPA Safe Drinking Water Information System (SDWIS) and SDWA violation records, via EPA ECHO, as published October 1, 2026 — AquaCensus refreshes it quarterly. See the methodology for how records are matched, cleaned and scored.
Cite as: AquaCensus, “Merry Widow Health Mine Unapproved, PWSID MT0004863, Montana”, https://aquacensus.com/water-systems/montana/merry-widow-health-mine-unapproved-mt0004863 (data as of October 1, 2026).