Public water system · MI0003730

Active

Lake Odessa

At a glance

Lake Odessa (PWSID MI0003730) is an active community water system in Ionia County, Michigan. It reports serving 2,018 people through 956 service connections. Its primary water source is groundwater, and EPA lists it as owned by a local government. EPA's records list 10 violations for this system; 2 are health-based, and the most recent began in November 2024.

Dataset updated October 2026 . Source: EPA SDWIS/ECHO public records.

Population served

2,018

Service connections

956

Primary source

Groundwater

System type

CWS

Community water system

System record

PWSIDMI0003730

System typeCommunity water system

Activity statusActive

Population served2,018

Service connections956

Primary water sourceGroundwater

Owner typeLocal government

Primacy agencyMI state drinking water program

City servedLake Odessa

StateMichigan

ZIP—

CountyIonia County

How does Lake Odessa compare with other water systems in Ionia County?

By EPA's size categories, Lake Odessa is a small system (501 to 3,300 people). Ionia County has 123 active public water systems, and Lake Odessa is the 4th-largest of them by population served. Its population served is about 5.4 times the county average of 376 people per system, and accounts for 4.4% 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 Lake Odessa 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 Lake Odessa?

EPA lists Lake Odessa 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 Lake Odessa have drinking water violations?

EPA's records list 10 violations for this system; 2 are health-based, and the most recent began in November 2024. The violations listed here began between August 1991 and November 2024. By type: 6 monitoring and reporting, 2 reporting, 1 required treatment not met and 1 contaminant level above the legal limit. The contaminant or rule involved most often is Total coliform bacteria (TCR) (4 of them). EPA lists 10 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
2024-11-11	ReportingReport Sample Result/Fail Monitor (RTCR) · code 4B	Revised Total Coliform Rulecode 8000	No	Resolved
2024-10-17	Required treatment not metLSL Inventory · code 2E	Lead and Copper Rule Revisionscode 5200	Yes	Resolved
2024-10-17	ReportingLSL Reporting · code 4G	Lead and Copper Rule Revisionscode 5200	No	Resolved
2021-10-01	Monitoring and reportingMonitoring and Reporting (DBP) · code 27	Total trihalomethanes (TTHM)code 2950	No	Resolved
2021-10-01	Monitoring and reportingMonitoring and Reporting (DBP) · code 27	Haloacetic acids (HAA5)code 2456	No	Resolved
2014-07-01	Monitoring and reportingMonitoring and Reporting (DBP) · code 27	Chlorinecode 0999	No	Resolved
2008-03-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22	Total coliform bacteria (TCR)code 3100	Yes	Resolved
2000-12-01	Monitoring and reportingMonitoring, Routine Major (TCR) · code 23	Total coliform bacteria (TCR)code 3100	No	Resolved
1993-06-01	Monitoring and reportingMonitoring, Routine Major (TCR) · code 23	Total coliform bacteria (TCR)code 3100	No	Resolved
1991-08-01	Monitoring and reportingMonitoring, Routine Major (TCR) · code 23	Total coliform bacteria (TCR)code 3100	No	Resolved

All 10 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.

Lake Odessa: frequently asked questions

Who runs Lake Odessa?

Lake Odessa (PWSID MI0003730) is a community water system owned by a local government. It is regulated by the MI state drinking water program.

How many people does Lake Odessa serve?

Lake Odessa reports serving 2,018 people through 956 service connections in Ionia County, Michigan.

Where does Lake Odessa 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 Lake Odessa have any drinking water violations?

EPA's records list 10 violations for this system; 2 are health-based, and the most recent began in November 2024. 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 Lake Odessa'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 10 violations for this system; 2 are health-based, and the most recent began in November 2024. For current results, consult the system's annual water quality report, EPA ECHO, or the MI state drinking water program.

Where can I find Lake Odessa's water quality report?

As a community water system, Lake Odessa 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
Ionia	Ionia	11,708	Community	Groundwater
Belding	Ionia	5,769	Community	Groundwater
Portland	Ionia	3,883	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, “Lake Odessa, PWSID MI0003730, Michigan”, https://aquacensus.com/water-systems/michigan/lake-odessa-mi0003730 (data as of October 1, 2026).