Public water system · MI0005120
ActiveOwosso, City of
At a glance
City of Owosso (PWSID MI0005120) is an active community water system in Shiawassee County, Michigan. It reports serving 16,353 people through 6,340 service connections. Its primary water source is surface water, and EPA lists it as owned by a local government. EPA's records list 5 violations for this system; 1 is health-based, and the most recent began in January 2023.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
16,353
Service connections
6,340
Primary source
SW
Surface water
System type
CWS
Community water system
System record
How does City of Owosso compare with other water systems in Shiawassee County?
By EPA's size categories, City of Owosso is a large system (10,001 to 100,000 people). Shiawassee County has 126 active public water systems, and City of Owosso is the largest of them by population served. Its population served is about 48 times the county average of 340 people per system, and accounts for 38% of the 42,865 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 City of Owosso is about 144% 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. Surface water means the system draws its water from rivers, lakes, streams or reservoirs. 68 Michigan systems (0.6%) list surface water as their primary source.
Who owns and regulates City of Owosso?
EPA lists City of Owosso 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. 7 of the 126 active systems in Shiawassee County (5.6%) are also owned by a local government.
Does City of Owosso have drinking water violations?
EPA's records list 5 violations for this system; 1 is health-based, and the most recent began in January 2023. The violations listed here began between October 1999 and January 2023. By type: 3 monitoring and reporting, 1 required treatment not met and 1 public notice, recordkeeping or other. The contaminants or rules involved are Haloacetic acids (HAA5), Total trihalomethanes (TTHM), Revised Total Coliform Rule and E. coli. 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 |
|---|---|---|---|---|
| 2023-01-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Haloacetic acids (HAA5)code 2456 | No | Resolved |
| 2023-01-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Total trihalomethanes (TTHM)code 2950 | No | Resolved |
| 2022-11-13 | Required treatment not metTreatment Technique, Level 1 Assessment (RTCR) · code 2A | Revised Total Coliform Rulecode 8000 | Yes | Resolved |
| 2022-10-14 | Monitoring and reportingMonitoring, Source Water (GWR) · code 34 | E. colicode 3014 | No | Resolved |
| 1999-10-19 | Public notice, recordkeeping or otherConsumer Confidence Report Complete Failure to Report · code 71 | Consumer Confidence Rulecode 7000 | No | 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.
City of Owosso: frequently asked questions
Who runs City of Owosso?
City of Owosso (PWSID MI0005120) is a community water system owned by a local government. It is regulated by the MI state drinking water program.
How many people does City of Owosso serve?
City of Owosso reports serving 16,353 people through 6,340 service connections in Shiawassee County, Michigan.
Where does City of Owosso get its water?
EPA SDWIS lists this system's primary water source as surface water. Surface water means the system draws its water from rivers, lakes, streams or reservoirs.
Does City of Owosso have any drinking water violations?
EPA's records list 5 violations for this system; 1 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 City of Owosso'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; 1 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 City of Owosso's water quality report?
As a community water system, City of Owosso 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 Shiawassee County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Durand, City of | Shiawassee | 3,446 | Community | Groundwater |
| Perry, City of | Shiawassee | 2,065 | Community | Groundwater |
| Corunna, City of | Shiawassee | 2,028 | Community | Purchased groundwater |
| Mdot - Woodbury Rest Area | Shiawassee | 1,200 | Transient non-community | Groundwater |
| Leisure Lake Snack Bar | Shiawassee | 1,000 | Transient non-community | Groundwater |
| Bancroft, Village of | Shiawassee | 616 | 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, “Owosso, City of, PWSID MI0005120, Michigan”, https://aquacensus.com/water-systems/michigan/owosso-city-of-mi0005120 (data as of October 1, 2026).