Public water system · ID7190028
ActiveIdaho Rocky Mountain Ranch
At a glance
Idaho Rocky Mountain Ranch (PWSID ID7190028) is an active transient non-community water system in Custer County, Idaho. It reports serving 65 people through 13 service connections. Its primary water source is groundwater, and EPA lists it as privately owned. EPA's records list 4 violations for this system; none is health-based, and the most recent began in April 1994.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
65
Service connections
13
Primary source
GW
Groundwater
System type
TNCWS
Transient non-community water system
System record
How does Idaho Rocky Mountain Ranch compare with other water systems in Custer County?
By EPA's size categories, Idaho Rocky Mountain Ranch is a very small system (500 people or fewer). Custer County has 57 active public water systems. Its population served is about 36% below the county average of 102 people per system, and accounts for 1.1% of the 5,823 people reported by systems filed under the county. Across Idaho, the 1,961 active systems average 899 people each. Nationally, the average active transient non-community water system reports serving 144 people, so Idaho Rocky Mountain Ranch is about half of 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. Idaho has 954 active transient non-community water systems, 49% of the state's 1,961 active systems. Groundwater means the system draws its water from wells or springs fed by underground aquifers. 1,861 Idaho systems (95%) list groundwater as their primary source.
Who owns and regulates Idaho Rocky Mountain Ranch?
EPA lists Idaho Rocky Mountain Ranch as privately owned. The ID 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 57 active systems in Custer County (53%) are also privately owned.
Does Idaho Rocky Mountain Ranch have drinking water violations?
EPA's records list 4 violations for this system; none is health-based, and the most recent began in April 1994. The violations listed here began between July 1992 and April 1994. By type: 4 monitoring and reporting. The contaminant or rule involved most often is Total coliform bacteria (TCR) (4 of them). EPA lists 4 as archived. 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 |
|---|---|---|---|---|
| 1994-04-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Archived |
| 1993-07-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Archived |
| 1993-04-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Archived |
| 1992-07-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Archived |
All 4 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.
Idaho Rocky Mountain Ranch: frequently asked questions
Who runs Idaho Rocky Mountain Ranch?
Idaho Rocky Mountain Ranch (PWSID ID7190028) is a transient non-community water system privately owned. It is regulated by the ID state drinking water program.
How many people does Idaho Rocky Mountain Ranch serve?
Idaho Rocky Mountain Ranch reports serving 65 people through 13 service connections in Custer County, Idaho.
Where does Idaho Rocky Mountain Ranch 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 Idaho Rocky Mountain Ranch have any drinking water violations?
EPA's records list 4 violations for this system; none is health-based, and the most recent began in April 1994. 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 Idaho Rocky Mountain Ranch'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 4 violations for this system; none is health-based, and the most recent began in April 1994. For current results, consult EPA ECHO, or the ID state drinking water program.
Where can I find Idaho Rocky Mountain Ranch's water quality report?
The annual Consumer Confidence Report requirement applies to community water systems. Idaho Rocky Mountain Ranch 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 Custer County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Challis City of | Custer | 900 | Community | Surface water |
| Mackay City of | Custer | 566 | Community | Groundwater |
| Blm Joe T Fallini | Custer | 540 | Transient non-community | Groundwater |
| Usfs Fishook Well | Custer | 460 | Transient non-community | Groundwater |
| Usfs Glacier View Campground | Custer | 314 | Transient non-community | Groundwater |
| Mountain Village Lodge and Restaurant | Custer | 225 | 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, “Idaho Rocky Mountain Ranch, PWSID ID7190028, Idaho”, https://aquacensus.com/water-systems/idaho/idaho-rocky-mountain-ranch-id7190028 (data as of October 1, 2026).