Public water system · MT0004951
ActiveBig Sky Grocery Unapproved
At a glance
Big Sky Grocery Unapproved (PWSID MT0004951) is an active transient non-community water system in Fergus County, Montana. It reports serving 90 people through 2 service connections. Its primary water source is groundwater, and EPA lists it as privately owned. EPA's records list 2 violations for this system; none is health-based, and the most recent began in January 2024.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
90
Service connections
2
Primary source
GW
Groundwater
System type
TNCWS
Transient non-community water system
System record
How does Big Sky Grocery Unapproved compare with other water systems in Fergus County?
By EPA's size categories, Big Sky Grocery Unapproved is a very small system (500 people or fewer). Fergus County has 21 active public water systems. Its population served is well below the county average of 533 people per system, and accounts for 0.8% of the 11,187 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 Big Sky Grocery Unapproved is about 37% 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 Big Sky Grocery Unapproved?
EPA lists Big Sky Grocery 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. 15 of the 21 active systems in Fergus County (71%) are also privately owned.
Does Big Sky Grocery Unapproved have drinking water violations?
EPA's records list 2 violations for this system; none is health-based, and the most recent began in January 2024. The violations listed here began between June 2017 and January 2024. By type: 1 monitoring and reporting and 1 monitoring. The contaminants or rules involved are Nitrate-Nitrite and Revised Total Coliform Rule. EPA lists 2 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 |
| 2017-06-01 | MonitoringMonitoring, Routine (RTCR) · code 3A | Revised Total Coliform Rulecode 8000 | No | Resolved |
All 2 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.
Big Sky Grocery Unapproved: frequently asked questions
Who runs Big Sky Grocery Unapproved?
Big Sky Grocery Unapproved (PWSID MT0004951) is a transient non-community water system privately owned. It is regulated by the MT state drinking water program.
How many people does Big Sky Grocery Unapproved serve?
Big Sky Grocery Unapproved reports serving 90 people through 2 service connections in Fergus County, Montana.
Where does Big Sky Grocery 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 Big Sky Grocery Unapproved have any drinking water violations?
EPA's records list 2 violations for this system; none is 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 Big Sky Grocery 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 2 violations for this system; none is 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 Big Sky Grocery Unapproved's water quality report?
The annual Consumer Confidence Report requirement applies to community water systems. Big Sky Grocery 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 Fergus County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Lewistown City of | Fergus | 5,923 | Community | Groundwater |
| Lehrkinds Big Spring Water | Fergus | 2,575 | Non-transient non-community | Purchased groundwater |
| Eddies Corner | Fergus | 503 | Transient non-community | Groundwater |
| K-M Scout Ranch Water System | Fergus | 325 | Transient non-community | Groundwater |
| Mountain Acres Mb Hm Pk | Fergus | 320 | Community | Purchased groundwater |
| Winifred Town of | Fergus | 274 | 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, “Big Sky Grocery Unapproved, PWSID MT0004951, Montana”, https://aquacensus.com/water-systems/montana/big-sky-grocery-unapproved-mt0004951 (data as of October 1, 2026).