Public water system · MT0000157
ActiveBlack Eagle Cascade County Water Sewer
At a glance
Black Eagle Cascade County Water Sewer (PWSID MT0000157) is an active community water system in Cascade County, Montana. It reports serving 1,233 people through 501 service connections. Its primary water source is purchased surface water, and EPA lists it as owned by a local government. EPA's records list 10 violations for this system; 5 are health-based, and the most recent began in January 2019.
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
1,233
Service connections
501
Primary source
SWP
Purchased surface water
System type
CWS
Community water system
System record
How does Black Eagle Cascade County Water Sewer compare with other water systems in Cascade County?
By EPA's size categories, Black Eagle Cascade County Water Sewer is a small system (501 to 3,300 people). Cascade County has 98 active public water systems. Its population served is about 25% above the county average of 985 people per system, and accounts for 1.3% of the 96,513 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 Black Eagle Cascade County Water Sewer 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 Black Eagle Cascade County Water Sewer?
EPA lists Black Eagle Cascade County Water Sewer 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. 14 of the 98 active systems in Cascade County (14%) are also owned by a local government.
Does Black Eagle Cascade County Water Sewer have drinking water violations?
EPA's records list 10 violations for this system; 5 are health-based, and the most recent began in January 2019. The violations listed here began between December 1993 and January 2019. By type: 5 contaminant level above the legal limit and 5 monitoring and reporting. The contaminant or rule involved most often is Haloacetic acids (HAA5) (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 |
|---|---|---|---|---|
| 2019-01-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Haloacetic acids (HAA5)code 2456 | Yes | Resolved |
| 2018-10-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Haloacetic acids (HAA5)code 2456 | Yes | Resolved |
| 2018-07-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Haloacetic acids (HAA5)code 2456 | Yes | Resolved |
| 2018-04-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Haloacetic acids (HAA5)code 2456 | Yes | Resolved |
| 2014-06-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 2014-01-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Total trihalomethanes (TTHM)code 2950 | No | Resolved |
| 2014-01-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Haloacetic acids (HAA5)code 2456 | No | Resolved |
| 2008-07-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 1998-06-01 | Monitoring and reportingMonitoring, Routine Minor (TCR) · code 24 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 1993-12-01 | Monitoring and reportingMonitoring, Routine Minor (TCR) · code 24 | Total coliform bacteria (TCR)code 3100 | 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.
Black Eagle Cascade County Water Sewer: frequently asked questions
Who runs Black Eagle Cascade County Water Sewer?
Black Eagle Cascade County Water Sewer (PWSID MT0000157) is a community water system owned by a local government. It is regulated by the MT state drinking water program.
How many people does Black Eagle Cascade County Water Sewer serve?
Black Eagle Cascade County Water Sewer reports serving 1,233 people through 501 service connections in Cascade County, Montana.
Where does Black Eagle Cascade County Water Sewer 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 Black Eagle Cascade County Water Sewer have any drinking water violations?
EPA's records list 10 violations for this system; 5 are health-based, and the most recent began in January 2019. 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 Black Eagle Cascade County Water Sewer'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; 5 are health-based, and the most recent began in January 2019. For current results, consult the system's annual water quality report, EPA ECHO, or the MT state drinking water program.
Where can I find Black Eagle Cascade County Water Sewer's water quality report?
As a community water system, Black Eagle Cascade County Water Sewer 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 Cascade County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Great Falls City of | Cascade | 60,000 | Community | Surface water |
| Malmstrom Air Force Base | Cascade | 8,850 | Community | Purchased surface water |
| Source Giant Springs Inc. | Cascade | 3,007 | Non-transient non-community | Groundwater |
| Montana Expo Park Cascade County | Cascade | 2,510 | Transient non-community | Purchased surface water |
| Sun Prairie Village County | Cascade | 1,800 | Community | Groundwater |
| University of Providence | Cascade | 1,472 | Non-transient non-community | Purchased surface water |
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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, “Black Eagle Cascade County Water Sewer, PWSID MT0000157, Montana”, https://aquacensus.com/water-systems/montana/black-eagle-cascade-county-water-sewer-mt0000157 (data as of October 1, 2026).