Public water system · MT0000058
ActiveRocky Mountain Wua
At a glance
Rocky Mountain Wua (PWSID MT0000058) is an active community water system in Jefferson County, Montana. It reports serving 30 people through 15 service connections. Its primary water source is groundwater, and EPA lists it as privately owned. Of the 12 most recent violations in EPA's records, 5 are health-based, and the most recent began in June 2025.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
30
Service connections
15
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does Rocky Mountain Wua compare with other water systems in Jefferson County?
By EPA's size categories, Rocky Mountain Wua is a very small system (500 people or fewer). Jefferson County has 41 active public water systems. Its population served is well below the county average of 241 people per system, and accounts for 0.3% of the 9,886 people reported by systems filed under the county. Across Montana, the 2,378 active systems average 489 people each. Nationally, the average active community water system reports serving 6,703 people, so Rocky Mountain Wua is well below that figure.
What does “community water system” mean?
A community water system serves at least 15 connections used by year-round residents, or regularly serves at least 25 year-round residents. Homes, apartments and mobile-home parks are served by these. Montana has 853 active community water systems, 36% 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 Rocky Mountain Wua?
EPA lists Rocky Mountain Wua 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. 30 of the 41 active systems in Jefferson County (73%) are also privately owned.
Does Rocky Mountain Wua have drinking water violations?
Of the 12 most recent violations in EPA's records, 5 are health-based, and the most recent began in June 2025. The violations listed here began between January 2009 and June 2025. By type: 6 monitoring and reporting, 5 contaminant level above the legal limit and 1 monitoring. The contaminant or rule involved most often is E. coli (4 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 |
|---|---|---|---|---|
| 2025-06-01 | MonitoringMonitoring, Routine (RTCR) · code 3A | Revised Total Coliform Rulecode 8000 | No | Resolved |
| 2021-04-02 | Monitoring and reportingMonitoring, Source Water (GWR) · code 34 | E. colicode 3014 | No | Resolved |
| 2015-12-25 | Monitoring and reportingMonitoring, Source Water (GWR) · code 34 | E. colicode 3014 | No | Resolved |
| 2014-12-30 | Monitoring and reportingLead Consumer Notice · code 66 | Lead and Copper Rulecode 5000 | No | Resolved |
| 2014-09-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 2014-03-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 2014-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Combined Uraniumcode 4006 | No | Resolved |
| 2013-10-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 2013-10-01 | Monitoring and reportingMonitoring, Source Water (GWR) · code 34 | E. colicode 3014 | No | Resolved |
| 2011-10-01 | Monitoring and reportingMonitoring, Source Water (GWR) · code 34 | E. colicode 3014 | No | Resolved |
| 2009-04-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Combined Uraniumcode 4006 | Yes | Resolved |
| 2009-01-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Combined Uraniumcode 4006 | Yes | 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.
Rocky Mountain Wua: frequently asked questions
Who runs Rocky Mountain Wua?
Rocky Mountain Wua (PWSID MT0000058) is a community water system privately owned. It is regulated by the MT state drinking water program.
How many people does Rocky Mountain Wua serve?
Rocky Mountain Wua reports serving 30 people through 15 service connections in Jefferson County, Montana.
Where does Rocky Mountain Wua 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 Rocky Mountain Wua have any drinking water violations?
Of the 12 most recent violations in EPA's records, 5 are health-based, and the most recent began in June 2025. 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 Rocky Mountain Wua'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, 5 are health-based, and the most recent began in June 2025. For current results, consult the system's annual water quality report, EPA ECHO, or the MT state drinking water program.
Where can I find Rocky Mountain Wua's water quality report?
As a community water system, Rocky Mountain Wua must deliver an annual water quality report, called a Consumer Confidence Report, to its customers by July 1 each year, covering the previous calendar year. The system can provide a copy on request.
Other water systems in Jefferson County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Whitehall Town of | Jefferson | 1,500 | Community | Groundwater |
| Boulder City of | Jefferson | 1,400 | Community | Groundwater |
| Jefferson Hills Wua | Jefferson | 780 | Community | Groundwater |
| Lewis and Clark Caverns Visitor Center | Jefferson | 615 | Transient non-community | Groundwater under influence of surface water |
| Jefferson City South Rest Stop | Jefferson | 600 | Transient non-community | Groundwater |
| Montana City School Dist 27 | Jefferson | 534 | Non-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, “Rocky Mountain Wua, PWSID MT0000058, Montana”, https://aquacensus.com/water-systems/montana/rocky-mountain-wua-mt0000058 (data as of October 1, 2026).