Public water system · MN1070005
ActiveGood Thunder
At a glance
Good Thunder (PWSID MN1070005) is an active community water system in Blue Earth County, Minnesota. It reports serving 583 people through 256 service connections. Its primary water source is groundwater, and EPA lists it as owned by a local government. EPA's records list 5 violations for this system; 3 are health-based, and the most recent began in April 2025.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
583
Service connections
256
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does Good Thunder compare with other water systems in Blue Earth County?
By EPA's size categories, Good Thunder is a small system (501 to 3,300 people). Blue Earth County has 63 active public water systems. Its population served is about 37% below the county average of 931 people per system, and accounts for 1% 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 Good Thunder 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 Good Thunder?
EPA lists Good Thunder 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 Good Thunder have drinking water violations?
EPA's records list 5 violations for this system; 3 are health-based, and the most recent began in April 2025. The violations listed here began between October 1991 and April 2025. By type: 3 contaminant level above the legal limit, 1 monitoring and reporting and 1 monitoring. The contaminant or rule involved most often is Total coliform bacteria (TCR) (3 of them). EPA lists 5 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 |
|---|---|---|---|---|
| 2025-04-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Chlorinecode 0999 | No | Resolved |
| 2025-04-01 | MonitoringMonitoring, Routine (RTCR) · code 3A | Revised Total Coliform Rulecode 8000 | No | Resolved |
| 2002-10-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 2000-10-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 1991-10-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
All 5 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.
Good Thunder: frequently asked questions
Who runs Good Thunder?
Good Thunder (PWSID MN1070005) is a community water system owned by a local government. It is regulated by the MN state drinking water program.
How many people does Good Thunder serve?
Good Thunder reports serving 583 people through 256 service connections in Blue Earth County, Minnesota.
Where does Good Thunder 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 Good Thunder have any drinking water violations?
EPA's records list 5 violations for this system; 3 are health-based, and the most recent began in April 2025. 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 Good Thunder'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 5 violations for this system; 3 are health-based, and the most recent began in April 2025. For current results, consult the system's annual water quality report, EPA ECHO, or the MN state drinking water program.
Where can I find Good Thunder's water quality report?
As a community water system, Good Thunder 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 |
| Madison Lake | Blue Earth | 1,017 | Community | Groundwater |
| Saint Clair | Blue Earth | 846 | 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, “Good Thunder, PWSID MN1070005, Minnesota”, https://aquacensus.com/water-systems/minnesota/good-thunder-mn1070005 (data as of October 1, 2026).