Public water system · MT0004936
ActiveNcmrwa Shelby To Ethridge
At a glance
Ncmrwa Shelby To Ethridge (PWSID MT0004936) is an active community water system in Toole County, Montana. It reports serving 70 people through 1 service connection. Its primary water source is purchased groundwater, and EPA lists it as privately owned. EPA's records list one violation for this system; it is not health-based, and the most recent began in November 2017.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
70
Service connections
1
Primary source
GWP
Purchased groundwater
System type
CWS
Community water system
System record
How does Ncmrwa Shelby To Ethridge compare with other water systems in Toole County?
By EPA's size categories, Ncmrwa Shelby To Ethridge is a very small system (500 people or fewer). Toole County has 18 active public water systems. Its population served is well below the county average of 361 people per system, and accounts for 1.1% of the 6,498 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 Ncmrwa Shelby To Ethridge 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. Purchased groundwater means the system buys groundwater from another public water system rather than drawing its own. 104 Montana systems (4.4%) list purchased groundwater as their primary source.
Who owns and regulates Ncmrwa Shelby To Ethridge?
EPA lists Ncmrwa Shelby To Ethridge 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. 10 of the 18 active systems in Toole County (56%) are also privately owned.
Does Ncmrwa Shelby To Ethridge have drinking water violations?
EPA's records list one violation for this system; it is not health-based, and the most recent began in November 2017. By type: 1 monitoring. The contaminant or rule involved is Revised Total Coliform Rule. EPA lists 1 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 |
|---|---|---|---|---|
| 2017-11-01 | MonitoringMonitoring, Routine (RTCR) · code 3A | Revised Total Coliform Rulecode 8000 | No | Resolved |
The one violation in EPA's records. 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.
Ncmrwa Shelby To Ethridge: frequently asked questions
Who runs Ncmrwa Shelby To Ethridge?
Ncmrwa Shelby To Ethridge (PWSID MT0004936) is a community water system privately owned. It is regulated by the MT state drinking water program.
How many people does Ncmrwa Shelby To Ethridge serve?
Ncmrwa Shelby To Ethridge reports serving 70 people through 1 service connection in Toole County, Montana.
Where does Ncmrwa Shelby To Ethridge get its water?
EPA SDWIS lists this system's primary water source as purchased groundwater. Purchased groundwater means the system buys groundwater from another public water system rather than drawing its own.
Does Ncmrwa Shelby To Ethridge have any drinking water violations?
EPA's records list one violation for this system; it is not health-based, and the most recent began in November 2017. 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 Ncmrwa Shelby To Ethridge'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 one violation for this system; it is not health-based, and the most recent began in November 2017. For current results, consult the system's annual water quality report, EPA ECHO, or the MT state drinking water program.
Where can I find Ncmrwa Shelby To Ethridge's water quality report?
As a community water system, Ncmrwa Shelby To Ethridge 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 Toole County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Shelby City of | Toole | 3,970 | Community | Groundwater |
| Sunburst Town of | Toole | 459 | Community | Groundwater |
| Oilmont County Water District | Toole | 300 | Community | Groundwater |
| Ncmrwa North Shelby | Toole | 300 | Community | Purchased groundwater |
| Kevin Town of | Toole | 290 | Community | Groundwater |
| Galata County Water District | Toole | 200 | Community | Groundwater |
Related pages
Working with water-system records? Pro adds alerts, change history and CSV export ($49/mo); Enterprise adds full national files, the API and an MCP server for AI tools.
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, “Ncmrwa Shelby To Ethridge, PWSID MT0004936, Montana”, https://aquacensus.com/water-systems/montana/ncmrwa-shelby-to-ethridge-mt0004936 (data as of October 1, 2026).