Public water system · MT0004796
ActiveRocky Mountain College
At a glance
Rocky Mountain College (PWSID MT0004796) is an active non-transient non-community water system in Yellowstone County, Montana. It reports serving 5,700 people through 17 service connections. Its primary water source is purchased surface water, and EPA lists it as privately owned. EPA's records list 3 violations for this system; none is health-based, and the most recent began in December 2012.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
5,700
Service connections
17
Primary source
SWP
Purchased surface water
System type
NTNCWS
Non-transient non-community water system
System record
How does Rocky Mountain College compare with other water systems in Yellowstone County?
By EPA's size categories, Rocky Mountain College is a medium system (3,301 to 10,000 people). Yellowstone County has 119 active public water systems, and Rocky Mountain College is the 5th-largest of them by population served. Its population served is about 4 times the county average of 1,422 people per system, and accounts for 3.4% of the 169,240 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 Rocky Mountain College is about 13 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. Purchased surface water means the system buys surface water from another public water system rather than drawing its own. 212 Montana systems (8.9%) list purchased surface water as their primary source.
Who owns and regulates Rocky Mountain College?
EPA lists Rocky Mountain College 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. 97 of the 119 active systems in Yellowstone County (82%) are also privately owned.
Does Rocky Mountain College have drinking water violations?
EPA's records list 3 violations for this system; none is health-based, and the most recent began in December 2012. The violations listed here began between October 2012 and December 2012. By type: 3 monitoring and reporting. The contaminant or rule involved most often is Total coliform bacteria (TCR) (3 of them). EPA lists 3 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 |
|---|---|---|---|---|
| 2012-12-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 2012-11-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 2012-10-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
All 3 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 College: frequently asked questions
Who runs Rocky Mountain College?
Rocky Mountain College (PWSID MT0004796) is a non-transient non-community water system privately owned. It is regulated by the MT state drinking water program.
How many people does Rocky Mountain College serve?
Rocky Mountain College reports serving 5,700 people through 17 service connections in Yellowstone County, Montana.
Where does Rocky Mountain College get its water?
EPA SDWIS lists this system's primary water source as purchased surface water. Purchased surface water means the system buys surface water from another public water system rather than drawing its own.
Does Rocky Mountain College have any drinking water violations?
EPA's records list 3 violations for this system; none is health-based, and the most recent began in December 2012. 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 College'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 3 violations for this system; none is health-based, and the most recent began in December 2012. For current results, consult EPA ECHO, or the MT state drinking water program.
Where can I find Rocky Mountain College's water quality report?
The annual Consumer Confidence Report requirement applies to community water systems. Rocky Mountain College 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 Yellowstone County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Billings City of | Yellowstone | 114,000 | Community | Surface water |
| Billings Heights Co Water Dist of | Yellowstone | 12,000 | Community | Purchased surface water |
| Laurel Municipal Water System | Yellowstone | 6,339 | Community | Surface water |
| Lockwood Water and Sewer District | Yellowstone | 5,900 | Community | Surface water |
| Montana State University Billings | Yellowstone | 2,999 | Non-transient non-community | Purchased surface water |
| Pioneer Water Service | Yellowstone | 900 | Community | Purchased surface water |
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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 College, PWSID MT0004796, Montana”, https://aquacensus.com/water-systems/montana/rocky-mountain-college-mt0004796 (data as of October 1, 2026).