Public water system · MI0002830
ActiveGrass Lake
At a glance
Grass Lake (PWSID MI0002830) is an active community water system in Jackson County, Michigan. It reports serving 1,986 people through 636 service connections. Its primary water source is groundwater, and EPA lists it as owned by a local government. EPA's records list 4 violations for this system; none is health-based, and the most recent began in January 2023.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
1,986
Service connections
636
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does Grass Lake compare with other water systems in Jackson County?
By EPA's size categories, Grass Lake is a small system (501 to 3,300 people). Jackson County has 218 active public water systems, and Grass Lake is the 6th-largest of them by population served. Its population served is about 3.4 times the county average of 583 people per system, and accounts for 1.6% of the 126,981 people reported by systems filed under the county. Across Michigan, the 10,599 active systems average 847 people each. Nationally, the average active community water system reports serving 6,703 people, so Grass 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. Michigan has 1,332 active community water systems, 13% of the state's 10,599 active systems. Groundwater means the system draws its water from wells or springs fed by underground aquifers. 10,214 Michigan systems (96%) list groundwater as their primary source.
Who owns and regulates Grass Lake?
EPA lists Grass Lake as owned by a local government. The MI state drinking water program is its primacy agency, the regulator with primary enforcement responsibility for the system under the Safe Drinking Water Act. 11 of the 218 active systems in Jackson County (5%) are also owned by a local government.
Does Grass Lake have drinking water violations?
EPA's records list 4 violations for this system; none is health-based, and the most recent began in January 2023. The violations listed here began between February 1996 and January 2023. By type: 3 monitoring and reporting and 1 reporting. The contaminants or rules involved are Total trihalomethanes (TTHM), Haloacetic acids (HAA5), Revised Total Coliform Rule and Total coliform bacteria (TCR). EPA lists 4 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 |
|---|---|---|---|---|
| 2023-01-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Total trihalomethanes (TTHM)code 2950 | No | Resolved |
| 2023-01-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Haloacetic acids (HAA5)code 2456 | No | Resolved |
| 2022-09-11 | ReportingReport Sample Result/Fail Monitor (RTCR) · code 4B | Revised Total Coliform Rulecode 8000 | No | Resolved |
| 1996-02-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
All 4 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.
Grass Lake: frequently asked questions
Who runs Grass Lake?
Grass Lake (PWSID MI0002830) is a community water system owned by a local government. It is regulated by the MI state drinking water program.
How many people does Grass Lake serve?
Grass Lake reports serving 1,986 people through 636 service connections in Jackson County, Michigan.
Where does Grass 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 Grass Lake have any drinking water violations?
EPA's records list 4 violations for this system; none is health-based, and the most recent began in January 2023. 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 Grass 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 4 violations for this system; none is health-based, and the most recent began in January 2023. For current results, consult the system's annual water quality report, EPA ECHO, or the MI state drinking water program.
Where can I find Grass Lake's water quality report?
As a community water system, Grass 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 Jackson County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Jackson | Jackson | 33,165 | Community | Groundwater under influence of surface water |
| Summit Township | Jackson | 25,355 | Community | Groundwater |
| Blackman Township | Jackson | 21,222 | Community | Purchased groundwater under influence |
| Mdot - Sandstone, R819 | Jackson | 2,000 | Transient non-community | Groundwater |
| Mdot - Grass Lake, R818 | Jackson | 2,000 | Transient non-community | Groundwater |
| Leoni Township | Jackson | 1,893 | 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, “Grass Lake, PWSID MI0002830, Michigan”, https://aquacensus.com/water-systems/michigan/grass-lake-mi0002830 (data as of October 1, 2026).