Public water system · MT0005209
ActiveBison Ridge Retreat Unapproved
At a glance
Bison Ridge Retreat Unapproved (PWSID MT0005209) is an active transient non-community water system in Flathead County, Montana. It reports serving 44 people through 5 service connections. Its primary water source is groundwater, and EPA lists it as owned by a local government. EPA's records list 5 violations for this system; none is health-based, and the most recent began in April 2026.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
44
Service connections
5
Primary source
GW
Groundwater
System type
TNCWS
Transient non-community water system
System record
How does Bison Ridge Retreat Unapproved compare with other water systems in Flathead County?
By EPA's size categories, Bison Ridge Retreat Unapproved is a very small system (500 people or fewer). Flathead County has 327 active public water systems. Its population served is well below the county average of 324 people per system, and accounts for less than 0.1% of the 105,781 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 Bison Ridge Retreat Unapproved 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. 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 Bison Ridge Retreat Unapproved?
EPA lists Bison Ridge Retreat Unapproved as owned by a local 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. 38 of the 327 active systems in Flathead County (12%) are also owned by a local government.
Does Bison Ridge Retreat Unapproved have drinking water violations?
EPA's records list 5 violations for this system; none is health-based, and the most recent began in April 2026. The violations listed here began between December 2025 and April 2026. By type: 5 monitoring. The contaminant or rule involved most often is Revised Total Coliform Rule (5 of them). EPA lists 5 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 |
|---|---|---|---|---|
| 2026-04-01 | MonitoringMonitoring, Routine (RTCR) · code 3A | Revised Total Coliform Rulecode 8000 | No | Resolved |
| 2026-03-01 | MonitoringMonitoring, Routine (RTCR) · code 3A | Revised Total Coliform Rulecode 8000 | No | Resolved |
| 2026-02-01 | MonitoringMonitoring, Routine (RTCR) · code 3A | Revised Total Coliform Rulecode 8000 | No | Resolved |
| 2026-01-01 | MonitoringMonitoring, Routine (RTCR) · code 3A | Revised Total Coliform Rulecode 8000 | No | Resolved |
| 2025-12-01 | MonitoringMonitoring, Routine (RTCR) · code 3A | Revised Total Coliform Rulecode 8000 | 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.
Bison Ridge Retreat Unapproved: frequently asked questions
Who runs Bison Ridge Retreat Unapproved?
Bison Ridge Retreat Unapproved (PWSID MT0005209) is a transient non-community water system owned by a local government. It is regulated by the MT state drinking water program.
How many people does Bison Ridge Retreat Unapproved serve?
Bison Ridge Retreat Unapproved reports serving 44 people through 5 service connections in Flathead County, Montana.
Where does Bison Ridge Retreat 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 Bison Ridge Retreat Unapproved have any drinking water violations?
EPA's records list 5 violations for this system; none is health-based, and the most recent began in April 2026. 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 Bison Ridge Retreat 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; none is health-based, and the most recent began in April 2026. For current results, consult EPA ECHO, or the MT state drinking water program.
Where can I find Bison Ridge Retreat Unapproved's water quality report?
The annual Consumer Confidence Report requirement applies to community water systems. Bison Ridge Retreat 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 Flathead County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Kalispell Public Works | Flathead | 25,000 | Community | Groundwater |
| Whitefish City of | Flathead | 10,418 | Community | Surface water |
| Flathead County Water and Sewer | Flathead | 7,775 | Community | Groundwater |
| Bigfork County Water and Sewer | Flathead | 6,100 | Community | Groundwater |
| Columbia Falls City of | Flathead | 4,450 | Community | Groundwater |
| Ridge Run | Flathead | 3,500 | 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, “Bison Ridge Retreat Unapproved, PWSID MT0005209, Montana”, https://aquacensus.com/water-systems/montana/bison-ridge-retreat-unapproved-mt0005209 (data as of October 1, 2026).