Public water system · MT0000328

Active

Shelby City of

At a glance

City of Shelby (PWSID MT0000328) is an active community water system in Toole County, Montana. It reports serving 3,970 people through 1,233 service connections. Its primary water source is groundwater, and EPA lists it as owned by a local government. Of the 12 most recent violations in EPA's records, one is health-based, and the most recent began in October 2024.

Dataset updated October 2026 . Source: EPA SDWIS/ECHO public records.

Population served

3,970

Service connections

1,233

Primary source

Groundwater

System type

CWS

Community water system

System record

PWSIDMT0000328

System typeCommunity water system

Activity statusActive

Population served3,970

Service connections1,233

Primary water sourceGroundwater

Owner typeLocal government

Primacy agencyMT state drinking water program

City servedShelby

StateMontana

ZIP—

CountyToole County

How does City of Shelby compare with other water systems in Toole County?

By EPA's size categories, City of Shelby is a medium system (3,301 to 10,000 people). Toole County has 18 active public water systems, and City of Shelby is the largest of them by population served. Its population served is about 11 times the county average of 361 people per system, and accounts for 61% 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 City of Shelby is about 41% 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 City of Shelby?

EPA lists City of 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 City of Shelby have drinking water violations?

Of the 12 most recent violations in EPA's records, one is health-based, and the most recent began in October 2024. The violations listed here began between January 2004 and October 2024. By type: 8 monitoring and reporting, 3 public notice, recordkeeping or other and 1 contaminant level above the legal limit. The contaminant or rule involved most often is Lead and Copper Rule (3 of them). EPA lists 11 as resolved and 1 as unaddressed. 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. Unaddressed means the violation is not resolved or archived and is not yet covered by formal enforcement.

Began	Violation	Contaminant or rule	Health-based	Status
2024-10-01	Monitoring and reportingFollow-up Or Routine LCR Tap M/R · code 52	Lead and Copper Rulecode 5000	No	Unaddressed
2020-07-22	Monitoring and reportingMonitoring, Source Water (GWR) · code 34	E. colicode 3014	No	Resolved
2020-01-01	Monitoring and reportingMonitoring, Regular · code 03	Asbestoscode 1094	No	Resolved
2019-10-09	Monitoring and reportingMonitoring, Source Water (GWR) · code 34	E. colicode 3014	No	Resolved
2017-12-30	Monitoring and reportingLead Consumer Notice · code 66	Lead and Copper Rulecode 5000	No	Resolved
2015-06-01	Monitoring and reportingMonitoring, Routine Minor (TCR) · code 24	Total coliform bacteria (TCR)code 3100	No	Resolved
2014-12-30	Monitoring and reportingLead Consumer Notice · code 66	Lead and Copper Rulecode 5000	No	Resolved
2014-07-01	Public notice, recordkeeping or otherConsumer Confidence Report Complete Failure to Report · code 71	Consumer Confidence Rulecode 7000	No	Resolved
2013-07-01	Public notice, recordkeeping or otherConsumer Confidence Report Complete Failure to Report · code 71	Consumer Confidence Rulecode 7000	No	Resolved
2012-09-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22	Total coliform bacteria (TCR)code 3100	Yes	Resolved
2011-07-01	Public notice, recordkeeping or otherConsumer Confidence Report Complete Failure to Report · code 71	Consumer Confidence Rulecode 7000	No	Resolved
2004-01-01	Monitoring and reportingMonitoring and Reporting (DBP) · code 27	Total trihalomethanes (TTHM)code 2950	No	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.

City of Shelby: frequently asked questions

Who runs City of Shelby?

City of Shelby (PWSID MT0000328) is a community water system owned by a local government. It is regulated by the MT state drinking water program.

How many people does City of Shelby serve?

City of Shelby reports serving 3,970 people through 1,233 service connections in Toole County, Montana.

Where does City of Shelby 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 City of Shelby have any drinking water violations?

Of the 12 most recent violations in EPA's records, one is health-based, and the most recent began in October 2024. 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 City of 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. Of the 12 most recent violations in EPA's records, one is health-based, and the most recent began in October 2024. For current results, consult the system's annual water quality report, EPA ECHO, or the MT state drinking water program.

Where can I find City of Shelby's water quality report?

As a community water system, City of 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
Sunburst Town of	Toole	459	Community	Groundwater
Ncmrwa North Shelby	Toole	300	Community	Purchased 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, “Shelby City of, PWSID MT0000328, Montana”, https://aquacensus.com/water-systems/montana/shelby-city-of-mt0000328 (data as of October 1, 2026).