Public water system · MT0000191
ActiveLittle Bighorn Battlefield Nm
At a glance
Little Bighorn Battlefield Nm (PWSID MT0000191) is an active non-transient non-community water system in Big Horn County, Montana. It reports serving 2,020 people through 11 service connections. Its primary water source is groundwater, and EPA lists it as owned by the federal government. Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in January 2022.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
2,020
Service connections
11
Primary source
GW
Groundwater
System type
NTNCWS
Non-transient non-community water system
System record
How does Little Bighorn Battlefield Nm compare with other water systems in Big Horn County?
By EPA's size categories, Little Bighorn Battlefield Nm is a small system (501 to 3,300 people). Big Horn County has 23 active public water systems, and Little Bighorn Battlefield Nm is the 2nd-largest of them by population served. Its population served is about 4.5 times the county average of 449 people per system, and accounts for 20% 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 non-transient non-community water system reports serving 430 people, so Little Bighorn Battlefield Nm is about 4.7 times that figure.
What does “non-transient non-community water system” mean?
A non-transient non-community water system regularly serves at least 25 of the same people for more than six months a year, but not where they live. Schools, factories, office buildings and hospitals with their own supply are typical examples. Montana has 319 active non-transient non-community water systems, 13% 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 Little Bighorn Battlefield Nm?
EPA lists Little Bighorn Battlefield Nm as owned by the federal 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 23 active systems in Big Horn County (13%) are also owned by the federal government.
Does Little Bighorn Battlefield Nm have drinking water violations?
Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in January 2022. The violations listed here began between January 2011 and January 2022. By type: 12 monitoring and reporting. The contaminant or rule involved most often is Lead and Copper Rule (4 of them). EPA lists 11 as resolved and 1 as archived. 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. Archived means the violation was not marked resolved but is more than five years past the end of the noncompliance period, so it no longer counts toward current compliance status.
| Began | Violation | Contaminant or rule | Health-based | Status |
|---|---|---|---|---|
| 2022-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Nitrate-Nitritecode 1038 | No | Resolved |
| 2021-01-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Total trihalomethanes (TTHM)code 2950 | No | Resolved |
| 2021-01-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Haloacetic acids (HAA5)code 2456 | No | Resolved |
| 2020-12-30 | Monitoring and reportingLead Consumer Notice · code 66 | Lead and Copper Rulecode 5000 | No | Resolved |
| 2019-10-01 | Monitoring and reportingFollow-up Or Routine LCR Tap M/R · code 52 | Lead and Copper Rulecode 5000 | No | Resolved |
| 2018-09-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Haloacetic acids (HAA5)code 2456 | No | Resolved |
| 2018-09-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Total trihalomethanes (TTHM)code 2950 | No | Resolved |
| 2014-01-01 | Monitoring and reportingLead Consumer Notice · code 66 | Lead and Copper Rulecode 5000 | No | Resolved |
| 2012-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Nitrate-Nitritecode 1038 | No | Resolved |
| 2011-11-01 | Monitoring and reportingMonitoring, Routine Minor (TCR) · code 24 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 2011-01-01 | Monitoring and reportingLead Consumer Notice · code 66 | Lead and Copper Rulecode 5000 | No | Resolved |
| 2011-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Asbestoscode 1094 | No | Archived |
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.
Little Bighorn Battlefield Nm: frequently asked questions
Who runs Little Bighorn Battlefield Nm?
Little Bighorn Battlefield Nm (PWSID MT0000191) is a non-transient non-community water system owned by the federal government. It is regulated by the MT state drinking water program.
How many people does Little Bighorn Battlefield Nm serve?
Little Bighorn Battlefield Nm reports serving 2,020 people through 11 service connections in Big Horn County, Montana.
Where does Little Bighorn Battlefield Nm 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 Little Bighorn Battlefield Nm have any drinking water violations?
Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in January 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 Little Bighorn Battlefield Nm'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, none is health-based, and the most recent began in January 2022. For current results, consult EPA ECHO, or the MT state drinking water program.
Where can I find Little Bighorn Battlefield Nm's water quality report?
The annual Consumer Confidence Report requirement applies to community water systems. Little Bighorn Battlefield Nm is a non-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 |
| 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 |
| Tongue River Campers Point | Big Horn | 305 | 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, “Little Bighorn Battlefield Nm, PWSID MT0000191, Montana”, https://aquacensus.com/water-systems/montana/little-bighorn-battlefield-nm-mt0000191 (data as of October 1, 2026).