Public water system · MT0005064
ActiveNcmrwa North Shelby
At a glance
Ncmrwa North Shelby (PWSID MT0005064) is an active community water system in Toole County, Montana. It reports serving 300 people through 8 service connections. Its primary water source is purchased groundwater, and EPA lists it as owned by a local government. EPA's records list 10 violations for this system; none is health-based, and the most recent began in April 2025.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
300
Service connections
8
Primary source
GWP
Purchased groundwater
System type
CWS
Community water system
System record
How does Ncmrwa North Shelby compare with other water systems in Toole County?
By EPA's size categories, Ncmrwa North Shelby is a very small system (500 people or fewer). Toole County has 18 active public water systems, and Ncmrwa North Shelby is the 3rd-largest of them by population served. Its population served is about 17% below the county average of 361 people per system, and accounts for 4.6% 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 North Shelby 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 North Shelby?
EPA lists Ncmrwa North Shelby as owned by a local 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. 8 of the 18 active systems in Toole County (44%) are also owned by a local government.
Does Ncmrwa North Shelby have drinking water violations?
EPA's records list 10 violations for this system; none is health-based, and the most recent began in April 2025. The violations listed here began between January 2021 and April 2025. By type: 9 monitoring and reporting and 1 monitoring. The contaminant or rule involved most often is Lead and Copper Rule (5 of them). EPA lists 10 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 |
|---|---|---|---|---|
| 2025-04-01 | Monitoring and reportingLead Consumer Notice · code 66 | Lead and Copper Rulecode 5000 | No | Resolved |
| 2024-01-01 | Monitoring and reportingInitial Tap Sampling for Pb and Cu · code 51 | Lead and Copper Rulecode 5000 | No | Resolved |
| 2022-09-29 | Monitoring and reportingLead Consumer Notice · code 66 | Lead and Copper Rulecode 5000 | No | Resolved |
| 2022-01-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Haloacetic acids (HAA5)code 2456 | No | Resolved |
| 2022-01-01 | Monitoring and reportingInitial Tap Sampling for Pb and Cu · code 51 | Lead and Copper Rulecode 5000 | No | Resolved |
| 2021-09-29 | Monitoring and reportingLead Consumer Notice · code 66 | Lead and Copper Rulecode 5000 | No | Resolved |
| 2021-07-01 | Monitoring and reportingMonitoring of Treatment (SWTR-Unfilt/GWR) · code 31 | Groundwater Rulecode 0700 | No | Resolved |
| 2021-06-01 | Monitoring and reportingMonitoring of Treatment (SWTR-Unfilt/GWR) · code 31 | Groundwater Rulecode 0700 | No | Resolved |
| 2021-03-01 | MonitoringMonitoring, Routine (RTCR) · code 3A | Revised Total Coliform Rulecode 8000 | No | Resolved |
| 2021-01-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Haloacetic acids (HAA5)code 2456 | No | Resolved |
All 10 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.
Ncmrwa North Shelby: frequently asked questions
Who runs Ncmrwa North Shelby?
Ncmrwa North Shelby (PWSID MT0005064) is a community water system owned by a local government. It is regulated by the MT state drinking water program.
How many people does Ncmrwa North Shelby serve?
Ncmrwa North Shelby reports serving 300 people through 8 service connections in Toole County, Montana.
Where does Ncmrwa North Shelby 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 North Shelby have any drinking water violations?
EPA's records list 10 violations for this system; none is health-based, and the most recent began in April 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 Ncmrwa North Shelby'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 10 violations for this system; none is health-based, and the most recent began in April 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 Ncmrwa North Shelby's water quality report?
As a community water system, Ncmrwa North Shelby 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 |
| Kevin Town of | Toole | 290 | Community | Groundwater |
| Galata County Water District | Toole | 200 | Community | Groundwater |
| Rimrock Colony | Toole | 124 | 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, “Ncmrwa North Shelby, PWSID MT0005064, Montana”, https://aquacensus.com/water-systems/montana/ncmrwa-north-shelby-mt0005064 (data as of October 1, 2026).