Public water system · MI0003370
ActiveIonia
At a glance
Ionia (PWSID MI0003370) is an active community water system in Ionia County, Michigan. It reports serving 11,708 people through 2,800 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; 1 is health-based, and the most recent began in June 2011.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
11,708
Service connections
2,800
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does Ionia compare with other water systems in Ionia County?
By EPA's size categories, Ionia is a large system (10,001 to 100,000 people). Ionia County has 123 active public water systems, and Ionia is the largest of them by population served. Its population served is about 31 times the county average of 376 people per system, and accounts for 25% of the 46,250 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 Ionia is about 75% above 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 Ionia?
EPA lists Ionia 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. 8 of the 123 active systems in Ionia County (6.5%) are also owned by a local government.
Does Ionia have drinking water violations?
EPA's records list 4 violations for this system; 1 is health-based, and the most recent began in June 2011. The violations listed here began between September 2007 and June 2011. By type: 3 monitoring and reporting and 1 contaminant level above the legal limit. The contaminant or rule involved most often is Total coliform bacteria (TCR) (3 of them). 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 |
|---|---|---|---|---|
| 2011-06-01 | Monitoring and reportingMonitoring, Repeat Minor (TCR) · code 26 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 2011-06-01 | Monitoring and reportingMonitoring, Source Water (GWR) · code 34 | E. colicode 3014 | No | Resolved |
| 2010-08-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 2007-09-01 | Monitoring and reportingMonitoring, Repeat Minor (TCR) · code 26 | 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.
Ionia: frequently asked questions
Who runs Ionia?
Ionia (PWSID MI0003370) is a community water system owned by a local government. It is regulated by the MI state drinking water program.
How many people does Ionia serve?
Ionia reports serving 11,708 people through 2,800 service connections in Ionia County, Michigan.
Where does Ionia 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 Ionia have any drinking water violations?
EPA's records list 4 violations for this system; 1 is health-based, and the most recent began in June 2011. 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 Ionia'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; 1 is health-based, and the most recent began in June 2011. For current results, consult the system's annual water quality report, EPA ECHO, or the MI state drinking water program.
Where can I find Ionia's water quality report?
As a community water system, Ionia 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 Ionia County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Belding | Ionia | 5,769 | Community | Groundwater |
| Portland | Ionia | 3,883 | Community | Groundwater |
| Lake Odessa | Ionia | 2,018 | Community | Groundwater |
| 1-9 Pilot LLC | Ionia | 1,522 | Transient non-community | Groundwater |
| Saranac | Ionia | 1,343 | Community | Groundwater |
| Mdot - Saranac, R532 | Ionia | 1,001 | Transient non-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, “Ionia, PWSID MI0003370, Michigan”, https://aquacensus.com/water-systems/michigan/ionia-mi0003370 (data as of October 1, 2026).