Public water system · MN1070007
ActiveMadison Lake
At a glance
Madison Lake (PWSID MN1070007) is an active community water system in Blue Earth County, Minnesota. It reports serving 1,017 people through 668 service connections. Its primary water source is groundwater, and EPA lists it as owned by a local government. EPA's records list 6 violations for this system; none is health-based, and the most recent began in July 2020.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
1,017
Service connections
668
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does Madison Lake compare with other water systems in Blue Earth County?
By EPA's size categories, Madison Lake is a small system (501 to 3,300 people). Blue Earth County has 63 active public water systems, and Madison Lake is the 5th-largest of them by population served. Its population served is roughly in line with the county average of 931 people per system, and accounts for 1.7% of the 58,656 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 Madison 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 Madison Lake?
EPA lists Madison 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. 17 of the 63 active systems in Blue Earth County (27%) are also owned by a local government.
Does Madison Lake have drinking water violations?
EPA's records list 6 violations for this system; none is health-based, and the most recent began in July 2020. The violations listed here began between June 1996 and July 2020. By type: 5 monitoring and reporting and 1 monitoring. The contaminants or rules involved are Chlorine, Revised Total Coliform Rule, Lead and Copper Rule and Haloacetic acids (HAA5). EPA lists 5 as resolved and 1 as archived. 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. 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 |
|---|---|---|---|---|
| 2020-07-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Chlorinecode 0999 | No | Resolved |
| 2020-07-01 | MonitoringMonitoring, Routine (RTCR) · code 3A | Revised Total Coliform Rulecode 8000 | No | Resolved |
| 2018-10-01 | Monitoring and reportingFollow-up Or Routine LCR Tap M/R · code 52 | Lead and Copper Rulecode 5000 | No | Resolved |
| 2014-01-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Haloacetic acids (HAA5)code 2456 | No | Resolved |
| 2014-01-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Total trihalomethanes (TTHM)code 2950 | No | Resolved |
| 1996-06-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Archived |
All 6 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.
Madison Lake: frequently asked questions
Who runs Madison Lake?
Madison Lake (PWSID MN1070007) is a community water system owned by a local government. It is regulated by the MN state drinking water program.
How many people does Madison Lake serve?
Madison Lake reports serving 1,017 people through 668 service connections in Blue Earth County, Minnesota.
Where does Madison 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 Madison Lake have any drinking water violations?
EPA's records list 6 violations for this system; none is health-based, and the most recent began in July 2020. 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 Madison 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 6 violations for this system; none is health-based, and the most recent began in July 2020. For current results, consult the system's annual water quality report, EPA ECHO, or the MN state drinking water program.
Where can I find Madison Lake's water quality report?
As a community water system, Madison 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 Blue Earth County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Mankato | Blue Earth | 42,803 | Community | Groundwater under influence of surface water |
| Eagle Lake | Blue Earth | 3,268 | Community | Groundwater |
| Lake Crystal | Blue Earth | 2,554 | Community | Groundwater |
| Mapleton | Blue Earth | 1,756 | Community | Groundwater |
| Saint Clair | Blue Earth | 846 | Community | Groundwater |
| Good Thunder | Blue Earth | 583 | 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, “Madison Lake, PWSID MN1070007, Minnesota”, https://aquacensus.com/water-systems/minnesota/madison-lake-mn1070007 (data as of October 1, 2026).