Public water system · MT0042412
ActiveChief Plenty Coups Museum
At a glance
Chief Plenty Coups Museum (PWSID MT0042412) is an active transient non-community water system in Big Horn County, Montana. It reports serving 262 people through 4 service connections. Its primary water source is groundwater, and EPA lists it as owned by a state government. Of the 12 most recent violations in EPA's records, 2 are health-based, and the most recent began in April 2020.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
262
Service connections
4
Primary source
GW
Groundwater
System type
TNCWS
Transient non-community water system
System record
How does Chief Plenty Coups Museum compare with other water systems in Big Horn County?
By EPA's size categories, Chief Plenty Coups Museum is a very small system (500 people or fewer). Big Horn County has 23 active public water systems. Its population served is about 42% below the county average of 449 people per system, and accounts for 2.5% of the 10,335 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 Chief Plenty Coups Museum is about 82% above 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 Chief Plenty Coups Museum?
EPA lists Chief Plenty Coups Museum 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. 5 of the 23 active systems in Big Horn County (22%) are also owned by a state government.
Does Chief Plenty Coups Museum have drinking water violations?
Of the 12 most recent violations in EPA's records, 2 are health-based, and the most recent began in April 2020. The violations listed here began between May 2012 and April 2020. By type: 8 monitoring and reporting, 2 monitoring and 2 required treatment not met. The contaminant or rule involved most often is Groundwater Rule (7 of them). EPA lists 12 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 |
|---|---|---|---|---|
| 2020-04-01 | MonitoringMonitoring, Routine (RTCR) · code 3A | Revised Total Coliform Rulecode 8000 | No | Resolved |
| 2017-07-01 | MonitoringMonitoring, Routine (RTCR) · code 3A | Revised Total Coliform Rulecode 8000 | No | Resolved |
| 2016-04-01 | Required treatment not metTreatment Technique (SWTR and GWR) · code 41 | Groundwater Rulecode 0700 | Yes | Resolved |
| 2016-02-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 2016-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Nitrate-Nitritecode 1038 | No | Resolved |
| 2015-10-01 | Monitoring and reportingMonitoring of Treatment (SWTR-Unfilt/GWR) · code 31 | Groundwater Rulecode 0700 | No | Resolved |
| 2015-09-01 | Monitoring and reportingMonitoring of Treatment (SWTR-Unfilt/GWR) · code 31 | Groundwater Rulecode 0700 | No | Resolved |
| 2015-05-01 | Required treatment not metTreatment Technique (SWTR and GWR) · code 41 | Groundwater Rulecode 0700 | Yes | Resolved |
| 2014-09-01 | Monitoring and reportingMonitoring of Treatment (SWTR-Unfilt/GWR) · code 31 | Groundwater Rulecode 0700 | No | Resolved |
| 2014-08-01 | Monitoring and reportingMonitoring of Treatment (SWTR-Unfilt/GWR) · code 31 | Groundwater Rulecode 0700 | No | Resolved |
| 2014-04-01 | Monitoring and reportingMonitoring of Treatment (SWTR-Unfilt/GWR) · code 31 | Groundwater Rulecode 0700 | No | Resolved |
| 2012-05-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
The 12 most recent 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.
Chief Plenty Coups Museum: frequently asked questions
Who runs Chief Plenty Coups Museum?
Chief Plenty Coups Museum (PWSID MT0042412) 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 Chief Plenty Coups Museum serve?
Chief Plenty Coups Museum reports serving 262 people through 4 service connections in Big Horn County, Montana.
Where does Chief Plenty Coups Museum 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 Chief Plenty Coups Museum have any drinking water violations?
Of the 12 most recent violations in EPA's records, 2 are health-based, and the most recent began in April 2020. 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 Chief Plenty Coups Museum'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. Of the 12 most recent violations in EPA's records, 2 are health-based, and the most recent began in April 2020. For current results, consult EPA ECHO, or the MT state drinking water program.
Where can I find Chief Plenty Coups Museum's water quality report?
The annual Consumer Confidence Report requirement applies to community water systems. Chief Plenty Coups Museum 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 Big Horn County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Hardin City of | Big Horn | 3,500 | Community | Surface water |
| Little Bighorn Battlefield Nm | Big Horn | 2,020 | Non-transient non-community | Groundwater |
| Hardin Eastbound Rest Area | Big Horn | 877 | Transient non-community | Groundwater |
| Hardin Westbound Rest Area | Big Horn | 715 | Transient non-community | Groundwater |
| Lodge Grass Town of | Big Horn | 480 | Community | Groundwater |
| Fort Smith Water and Sewer District | Big Horn | 450 | 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, “Chief Plenty Coups Museum, PWSID MT0042412, Montana”, https://aquacensus.com/water-systems/montana/chief-plenty-coups-museum-mt0042412 (data as of October 1, 2026).