Public water system · MT0003041
ActiveCuster Co Water and Sewer Dist
At a glance
Custer Co Water and Sewer Dist (PWSID MT0003041) is an active community water system in Custer County, Montana. It reports serving 480 people through 286 service connections. Its primary water source is purchased surface water, and EPA lists it as owned by a local government. EPA's records list 4 violations for this system; none is health-based, and the most recent began in July 2015.
This page covers its drinking water system only; sewer and wastewater service are not part of EPA's drinking water records.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
480
Service connections
286
Primary source
SWP
Purchased surface water
System type
CWS
Community water system
System record
How does Custer Co Water and Sewer Dist compare with other water systems in Custer County?
By EPA's size categories, Custer Co Water and Sewer Dist is a very small system (500 people or fewer). Custer County has 11 active public water systems, and Custer Co Water and Sewer Dist is the 2nd-largest of them by population served. Its population served is about half of the county average of 962 people per system, and accounts for 4.5% of the 10,579 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 Custer Co Water and Sewer Dist 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 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 Custer Co Water and Sewer Dist?
EPA lists Custer Co Water and Sewer Dist 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. 4 of the 11 active systems in Custer County (36%) are also owned by a local government.
Does Custer Co Water and Sewer Dist have drinking water violations?
EPA's records list 4 violations for this system; none is health-based, and the most recent began in July 2015. The violations listed here began between December 1997 and July 2015. By type: 3 monitoring and reporting and 1 public notice, recordkeeping or other. The contaminant or rule involved most often is Lead and Copper Rule (2 of them). EPA lists 4 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 |
|---|---|---|---|---|
| 2015-07-01 | Public notice, recordkeeping or otherConsumer Confidence Report Complete Failure to Report · code 71 | Consumer Confidence Rulecode 7000 | No | Resolved |
| 2007-10-01 | Monitoring and reportingFollow-up Or Routine LCR Tap M/R · code 52 | Lead and Copper Rulecode 5000 | No | Resolved |
| 2004-10-01 | Monitoring and reportingFollow-up Or Routine LCR Tap M/R · code 52 | Lead and Copper Rulecode 5000 | No | Resolved |
| 1997-12-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
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.
Custer Co Water and Sewer Dist: frequently asked questions
Who runs Custer Co Water and Sewer Dist?
Custer Co Water and Sewer Dist (PWSID MT0003041) is a community water system owned by a local government. It is regulated by the MT state drinking water program.
How many people does Custer Co Water and Sewer Dist serve?
Custer Co Water and Sewer Dist reports serving 480 people through 286 service connections in Custer County, Montana.
Where does Custer Co Water and Sewer Dist 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 Custer Co Water and Sewer Dist have any drinking water violations?
EPA's records list 4 violations for this system; none is health-based, and the most recent began in July 2015. 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 Custer Co Water and Sewer Dist'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 July 2015. For current results, consult the system's annual water quality report, EPA ECHO, or the MT state drinking water program.
Where can I find Custer Co Water and Sewer Dist's water quality report?
As a community water system, Custer Co Water and Sewer Dist 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 Custer County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Miles City City of | Custer | 9,565 | Community | Surface water |
| Pine Hills Youth Correct Facil | Custer | 193 | Community | Purchased surface water |
| Kinsey School District 63 | Custer | 86 | Non-transient non-community | Groundwater |
| Big Sky Camp and Rv Park | Custer | 56 | Transient non-community | Groundwater |
| Palisades Apartments | Custer | 50 | Community | Groundwater |
| Kircher School Dist 03 | Custer | 45 | Non-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, “Custer Co Water and Sewer Dist, PWSID MT0003041, Montana”, https://aquacensus.com/water-systems/montana/custer-co-water-and-sewer-dist-mt0003041 (data as of October 1, 2026).