Public water system · MT0004232
ActiveMosby Rest Area
At a glance
Mosby Rest Area (PWSID MT0004232) is an active transient non-community water system in Garfield County, Montana. It reports serving 100 people through 2 service connections. Its primary water source is groundwater, and EPA lists it as owned by a state government. EPA's records list one violation for this system; it is not health-based, and the most recent began in January 2024.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
100
Service connections
2
Primary source
GW
Groundwater
System type
TNCWS
Transient non-community water system
System record
How does Mosby Rest Area compare with other water systems in Garfield County?
By EPA's size categories, Mosby Rest Area is a very small system (500 people or fewer). Garfield County has 6 active public water systems, and Mosby Rest Area is the 4th-largest of them by population served. Its population served is about 40% below the county average of 168 people per system, and accounts for 9.9% of the 1,006 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 Mosby Rest Area is about 31% 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 Mosby Rest Area?
EPA lists Mosby Rest Area as owned by a state government. 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. 3 of the 6 active systems in Garfield County (50%) are also owned by a state government.
Does Mosby Rest Area have drinking water violations?
EPA's records list one violation for this system; it is not health-based, and the most recent began in January 2024. By type: 1 monitoring and reporting. The contaminant or rule involved is Nitrate-Nitrite. 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 |
|---|---|---|---|---|
| 2024-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Nitrate-Nitritecode 1038 | 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.
Mosby Rest Area: frequently asked questions
Who runs Mosby Rest Area?
Mosby Rest Area (PWSID MT0004232) is a transient non-community water system owned by a state government. It is regulated by the MT state drinking water program.
How many people does Mosby Rest Area serve?
Mosby Rest Area reports serving 100 people through 2 service connections in Garfield County, Montana.
Where does Mosby Rest Area 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 Mosby Rest Area 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 January 2024. 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 Mosby Rest Area'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 January 2024. For current results, consult EPA ECHO, or the MT state drinking water program.
Where can I find Mosby Rest Area's water quality report?
The annual Consumer Confidence Report requirement applies to community water systems. Mosby Rest Area 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 Garfield County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Jordan Town of | Garfield | 364 | Community | Groundwater |
| Under Canvas Bryce Canyon | Garfield | 240 | Transient non-community | Groundwater |
| Hell Creek Recreation Area LLC | Garfield | 202 | Transient non-community | Groundwater |
| Hell Creek Marina | Garfield | 50 | Transient non-community | Purchased groundwater |
| Flowing Wells Rest Stop | Garfield | 50 | 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, “Mosby Rest Area, PWSID MT0004232, Montana”, https://aquacensus.com/water-systems/montana/mosby-rest-area-mt0004232 (data as of October 1, 2026).