Public water system · MI0003837
ActiveLeoni Township
At a glance
Leoni Township (PWSID MI0003837) is an active community water system in Jackson County, Michigan. It reports serving 1,893 people through 757 service connections. Its primary water source is groundwater, and EPA lists it as owned by a local government. EPA's records list 7 violations for this system; none is health-based, and the most recent began in October 2025.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
1,893
Service connections
757
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does Leoni Township compare with other water systems in Jackson County?
By EPA's size categories, Leoni Township is a small system (501 to 3,300 people). Jackson County has 218 active public water systems. Its population served is about 3.2 times the county average of 583 people per system, and accounts for 1.5% 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 Leoni Township 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 Leoni Township?
EPA lists Leoni Township 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 Leoni Township have drinking water violations?
EPA's records list 7 violations for this system; none is health-based, and the most recent began in October 2025. The violations listed here began between September 2001 and October 2025. By type: 5 monitoring and reporting and 2 public notice, recordkeeping or other. The contaminant or rule involved most often is Total coliform bacteria (TCR) (4 of them). EPA lists 7 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 |
|---|---|---|---|---|
| 2025-10-11 | Monitoring and reportingFollow-up Or Routine LCR Tap M/R · code 52 | Lead and Copper Rulecode 5000 | No | Resolved |
| 2020-07-01 | Public notice, recordkeeping or otherConsumer Confidence Report Complete Failure to Report · code 71 | Consumer Confidence Rulecode 7000 | No | Resolved |
| 2010-08-01 | Monitoring and reportingMonitoring, Repeat Minor (TCR) · code 26 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 2004-12-01 | Monitoring and reportingMonitoring, Routine Minor (TCR) · code 24 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 2003-08-01 | Public notice, recordkeeping or otherPublic Notification Violation for NPDWR Violation · code 75 | Public Noticecode 7500 | No | Resolved |
| 2002-07-01 | Monitoring and reportingMonitoring, Repeat Minor (TCR) · code 26 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 2001-09-01 | Monitoring and reportingMonitoring, Repeat Minor (TCR) · code 26 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
All 7 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.
Leoni Township: frequently asked questions
Who runs Leoni Township?
Leoni Township (PWSID MI0003837) is a community water system owned by a local government. It is regulated by the MI state drinking water program.
How many people does Leoni Township serve?
Leoni Township reports serving 1,893 people through 757 service connections in Jackson County, Michigan.
Where does Leoni Township 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 Leoni Township have any drinking water violations?
EPA's records list 7 violations for this system; none is health-based, and the most recent began in October 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 Leoni Township'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 7 violations for this system; none is health-based, and the most recent began in October 2025. For current results, consult the system's annual water quality report, EPA ECHO, or the MI state drinking water program.
Where can I find Leoni Township's water quality report?
As a community water system, Leoni Township 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 |
| Grass Lake | Jackson | 1,986 | Community | Groundwater |
Related pages
Working with water-system records? Pro adds alerts, change history and CSV export ($49/mo); Enterprise adds full national files, the API and an MCP server for AI tools.
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, “Leoni Township, PWSID MI0003837, Michigan”, https://aquacensus.com/water-systems/michigan/leoni-township-mi0003837 (data as of October 1, 2026).