Public water system · MT0005091
ActiveNws Arctic Mountain Winco Missoula
At a glance
Nws Arctic Mountain Winco Missoula (PWSID MT0005091) is an active transient non-community water system in Missoula County, Montana. It reports serving 26 people through 1 service connection. Its primary water source is purchased groundwater, and EPA lists it as privately owned. EPA's records list one violation for this system; it is not health-based, and the most recent began in October 2022.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
26
Service connections
1
Primary source
GWP
Purchased groundwater
System type
TNCWS
Transient non-community water system
System record
How does Nws Arctic Mountain Winco Missoula compare with other water systems in Missoula County?
By EPA's size categories, Nws Arctic Mountain Winco Missoula is a very small system (500 people or fewer). Missoula County has 244 active public water systems. Its population served is well below the county average of 576 people per system, and accounts for less than 0.1% of the 140,505 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 Nws Arctic Mountain Winco Missoula is well 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. Purchased groundwater means the system buys groundwater from another public water system rather than drawing its own. 104 Montana systems (4.4%) list purchased groundwater as their primary source.
Who owns and regulates Nws Arctic Mountain Winco Missoula?
EPA lists Nws Arctic Mountain Winco Missoula 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. 201 of the 244 active systems in Missoula County (82%) are also privately owned.
Does Nws Arctic Mountain Winco Missoula have drinking water violations?
EPA's records list one violation for this system; it is not health-based, and the most recent began in October 2022. By type: 1 monitoring. The contaminant or rule involved is Revised Total Coliform Rule. EPA lists 1 as resolved. 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.
| Began | Violation | Contaminant or rule | Health-based | Status |
|---|---|---|---|---|
| 2022-10-01 | MonitoringMonitoring, Routine (RTCR) · code 3A | Revised Total Coliform Rulecode 8000 | No | Resolved |
The one violation in EPA's records.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.
Nws Arctic Mountain Winco Missoula: frequently asked questions
Who runs Nws Arctic Mountain Winco Missoula?
Nws Arctic Mountain Winco Missoula (PWSID MT0005091) is a transient non-community water system privately owned. It is regulated by the MT state drinking water program.
How many people does Nws Arctic Mountain Winco Missoula serve?
Nws Arctic Mountain Winco Missoula reports serving 26 people through 1 service connection in Missoula County, Montana.
Where does Nws Arctic Mountain Winco Missoula get its water?
EPA SDWIS lists this system's primary water source as purchased groundwater. Purchased groundwater means the system buys groundwater from another public water system rather than drawing its own.
Does Nws Arctic Mountain Winco Missoula have any drinking water violations?
EPA's records list one violation for this system; it is not health-based, and the most recent began in October 2022. 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 Nws Arctic Mountain Winco Missoula'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 one violation for this system; it is not health-based, and the most recent began in October 2022. For current results, consult EPA ECHO, or the MT state drinking water program.
Where can I find Nws Arctic Mountain Winco Missoula's water quality report?
The annual Consumer Confidence Report requirement applies to community water systems. Nws Arctic Mountain Winco Missoula 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 Missoula County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Missoula Water | Missoula | 68,200 | Community | Groundwater |
| University of Montana | Missoula | 15,000 | Non-transient non-community | Purchased groundwater |
| Lolo Water and Sewer Dist | Missoula | 3,315 | Community | Groundwater |
| Town Pump Bonner 1 | Missoula | 2,460 | Non-transient non-community | Groundwater |
| Clearwater Junction Rest Area | Missoula | 2,002 | Transient non-community | Groundwater |
| Seeley Lake Water District | Missoula | 1,575 | Community | Surface water |
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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, “Nws Arctic Mountain Winco Missoula, PWSID MT0005091, Montana”, https://aquacensus.com/water-systems/montana/nws-arctic-mountain-winco-missoula-mt0005091 (data as of October 1, 2026).