Public water system · MN1110006
ActiveCass Lake
At a glance
Cass Lake (PWSID MN1110006) is an active community water system in Cass County, Minnesota. It reports serving 691 people through 323 service connections. Its primary water source is groundwater, and EPA lists it as owned by a local government. EPA's records list one violation for this system; it is not health-based, and the most recent began in January 1993.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
691
Service connections
323
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does Cass Lake compare with other water systems in Cass County?
By EPA's size categories, Cass Lake is a small system (501 to 3,300 people). Cass County has 248 active public water systems, and Cass Lake is the 4th-largest of them by population served. Its population served is about 7 times the county average of 98 people per system, and accounts for 2.8% of the 24,374 people reported by systems filed under the county. Across Minnesota, the 6,465 active systems average 820 people each. Nationally, the average active community water system reports serving 6,703 people, so Cass Lake 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. Minnesota has 987 active community water systems, 15% of the state's 6,465 active systems. Groundwater means the system draws its water from wells or springs fed by underground aquifers. 6,261 Minnesota systems (97%) list groundwater as their primary source.
Who owns and regulates Cass Lake?
EPA lists Cass Lake as owned by a local government. The MN 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 248 active systems in Cass County (3.2%) are also owned by a local government.
Does Cass Lake have drinking water violations?
EPA's records list one violation for this system; it is not health-based, and the most recent began in January 1993. By type: 1 monitoring and reporting. The contaminant or rule involved is Nitrate. EPA lists 1 as archived. Archived means the violation was not marked resolved but is more than five years past the end of the noncompliance period, so it no longer counts toward current compliance status.
| Began | Violation | Contaminant or rule | Health-based | Status |
|---|---|---|---|---|
| 1993-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Nitratecode 1040 | No | Archived |
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.
Cass Lake: frequently asked questions
Who runs Cass Lake?
Cass Lake (PWSID MN1110006) is a community water system owned by a local government. It is regulated by the MN state drinking water program.
How many people does Cass Lake serve?
Cass Lake reports serving 691 people through 323 service connections in Cass County, Minnesota.
Where does Cass Lake 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 Cass Lake 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 January 1993. 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 Cass Lake'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 January 1993. For current results, consult the system's annual water quality report, EPA ECHO, or the MN state drinking water program.
Where can I find Cass Lake's water quality report?
As a community water system, Cass Lake 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 Cass County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Walker | Cass | 990 | Community | Groundwater |
| Pine River | Cass | 939 | Community | Groundwater |
| Cass Lake Wayside Rest Mndot | Cass | 873 | Transient non-community | Groundwater |
| Pillager | Cass | 523 | Community | Groundwater |
| Y Mart | Cass | 500 | Transient non-community | Groundwater |
| The One Stop | Cass | 500 | 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, “Cass Lake, PWSID MN1110006, Minnesota”, https://aquacensus.com/water-systems/minnesota/cass-lake-mn1110006 (data as of October 1, 2026).