Public water system · MN1070009
ActiveMankato
At a glance
Mankato (PWSID MN1070009) is an active community water system in Blue Earth County, Minnesota. It reports serving 42,803 people through 10,779 service connections. Its primary water source is groundwater under influence of surface water, 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 1994.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
42,803
Service connections
10,779
Primary source
GU
Groundwater under influence of surface water
System type
CWS
Community water system
System record
How does Mankato compare with other water systems in Blue Earth County?
By EPA's size categories, Mankato is a large system (10,001 to 100,000 people). Blue Earth County has 63 active public water systems, and Mankato is the largest of them by population served. Its population served is about 46 times the county average of 931 people per system, and accounts for 73% 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 Mankato is about 6.4 times 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 under the influence of surface water is well or spring water that the regulator has found to be affected by nearby surface water, so it is regulated under the surface-water treatment rules. 17 Minnesota systems (0.3%) list groundwater under influence of surface water as their primary source.
Who owns and regulates Mankato?
EPA lists Mankato 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 Mankato 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 1994. 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 |
|---|---|---|---|---|
| 1994-01-01 | 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.
Mankato: frequently asked questions
Who runs Mankato?
Mankato (PWSID MN1070009) is a community water system owned by a local government. It is regulated by the MN state drinking water program.
How many people does Mankato serve?
Mankato reports serving 42,803 people through 10,779 service connections in Blue Earth County, Minnesota.
Where does Mankato get its water?
EPA SDWIS lists this system's primary water source as groundwater under influence of surface water. Groundwater under the influence of surface water is well or spring water that the regulator has found to be affected by nearby surface water, so it is regulated under the surface-water treatment rules.
Does Mankato 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 1994. 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 Mankato'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 1994. For current results, consult the system's annual water quality report, EPA ECHO, or the MN state drinking water program.
Where can I find Mankato's water quality report?
As a community water system, Mankato 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 |
|---|---|---|---|---|
| Eagle Lake | Blue Earth | 3,268 | Community | Groundwater |
| Lake Crystal | Blue Earth | 2,554 | Community | Groundwater |
| Mapleton | Blue Earth | 1,756 | Community | Groundwater |
| Madison Lake | Blue Earth | 1,017 | 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, “Mankato, PWSID MN1070009, Minnesota”, https://aquacensus.com/water-systems/minnesota/mankato-mn1070009 (data as of October 1, 2026).