Public water system · MI0001130
ActiveCaro, City of
At a glance
City of Caro (PWSID MI0001130) is an active community water system in Tuscola County, Michigan. It reports serving 5,029 people through 1,800 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; 1 is health-based, and the most recent began in November 2024.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
5,029
Service connections
1,800
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does City of Caro compare with other water systems in Tuscola County?
By EPA's size categories, City of Caro is a medium system (3,301 to 10,000 people). Tuscola County has 91 active public water systems, and City of Caro is the largest of them by population served. Its population served is about 17 times the county average of 293 people per system, and accounts for 19% of the 26,657 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 Caro is about 25% 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 City of Caro?
EPA lists City of Caro 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 91 active systems in Tuscola County (12%) are also owned by a local government.
Does City of Caro have drinking water violations?
EPA's records list 10 violations for this system; 1 is health-based, and the most recent began in November 2024. The violations listed here began between July 2001 and November 2024. By type: 6 monitoring and reporting, 2 reporting, 1 contaminant level above the legal limit and 1 public notice, recordkeeping or other. The contaminant or rule involved most often is Arsenic (5 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 |
|---|---|---|---|---|
| 2024-11-01 | Monitoring and reportingMonitoring, Regular · code 03 | Arseniccode 1005 | No | Resolved |
| 2024-10-01 | Monitoring and reportingMonitoring, Regular · code 03 | Arseniccode 1005 | No | Resolved |
| 2021-07-11 | ReportingReport Sample Result/Fail Monitor (RTCR) · code 4B | Revised Total Coliform Rulecode 8000 | No | Resolved |
| 2018-11-06 | ReportingReporting, Assessment Forms (RTCR) · code 4A | Revised Total Coliform Rulecode 8000 | No | Resolved |
| 2018-01-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Total trihalomethanes (TTHM)code 2950 | No | Resolved |
| 2018-01-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Haloacetic acids (HAA5)code 2456 | No | Resolved |
| 2006-04-01 | Monitoring and reportingMonitoring, Regular · code 03 | Arseniccode 1005 | No | Resolved |
| 2006-01-23 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Arseniccode 1005 | Yes | Resolved |
| 2005-04-01 | Monitoring and reportingMonitoring, Regular · code 03 | Arseniccode 1005 | No | Resolved |
| 2001-07-01 | Public notice, recordkeeping or otherConsumer Confidence Report Complete Failure to Report · code 71 | Consumer Confidence Rulecode 7000 | 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.
City of Caro: frequently asked questions
Who runs City of Caro?
City of Caro (PWSID MI0001130) 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 Caro serve?
City of Caro reports serving 5,029 people through 1,800 service connections in Tuscola County, Michigan.
Where does City of Caro 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 City of Caro have any drinking water violations?
EPA's records list 10 violations for this system; 1 is 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 City of Caro'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; 1 is 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 City of Caro's water quality report?
As a community water system, City of Caro 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 Tuscola County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Vassar, City of | Tuscola | 2,697 | Community | Groundwater |
| Cass City, Village of | Tuscola | 2,428 | Community | Groundwater |
| G.C. Express | Tuscola | 1,400 | Transient non-community | Groundwater |
| Millington, Village of | Tuscola | 1,072 | Community | Groundwater |
| Mayville, Village of | Tuscola | 950 | Community | Groundwater |
| Ber Wa Ga Na Campground | Tuscola | 736 | 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, “Caro, City of, PWSID MI0001130, Michigan”, https://aquacensus.com/water-systems/michigan/caro-city-of-mi0001130 (data as of October 1, 2026).