Public water system · MI0004450
ActiveMonroe
At a glance
Monroe (PWSID MI0004450) is an active community water system in Monroe County, Michigan. It reports serving 49,467 people through 18,271 service connections. Its primary water source is surface water, and EPA lists it as owned by a local government. EPA's records list 4 violations for this system; all are health-based, and the most recent began in June 2017.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
49,467
Service connections
18,271
Primary source
SW
Surface water
System type
CWS
Community water system
System record
How does Monroe compare with other water systems in Monroe County?
By EPA's size categories, Monroe is a large system (10,001 to 100,000 people). Monroe County has 83 active public water systems, and Monroe is the largest of them by population served. Its population served is about 29 times the county average of 1,703 people per system, and accounts for 35% of the 141,308 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 Monroe is about 7.4 times 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 Monroe?
EPA lists Monroe 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. 9 of the 83 active systems in Monroe County (11%) are also owned by a local government.
Does Monroe have drinking water violations?
EPA's records list 4 violations for this system; all are health-based, and the most recent began in June 2017. The violations listed here began between October 1991 and June 2017. By type: 4 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 |
|---|---|---|---|---|
| 2017-06-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, E. coli (RTCR) · code 1A | Revised Total Coliform Rulecode 8000 | Yes | Resolved |
| 2011-06-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 2011-05-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 1991-10-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Acute (TCR) · code 21 | Total coliform bacteria (TCR)code 3100 | Yes | 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.
Monroe: frequently asked questions
Who runs Monroe?
Monroe (PWSID MI0004450) is a community water system owned by a local government. It is regulated by the MI state drinking water program.
How many people does Monroe serve?
Monroe reports serving 49,467 people through 18,271 service connections in Monroe County, Michigan.
Where does Monroe 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 Monroe have any drinking water violations?
EPA's records list 4 violations for this system; all are health-based, and the most recent began in June 2017. 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 Monroe'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; all are health-based, and the most recent began in June 2017. For current results, consult the system's annual water quality report, EPA ECHO, or the MI state drinking water program.
Where can I find Monroe's water quality report?
As a community water system, Monroe 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 Monroe County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Monroe South County | Monroe | 33,816 | Community | Purchased surface water |
| Frenchtown Township | Monroe | 21,609 | Community | Surface water |
| Berlin Township | Monroe | 9,900 | Community | Purchased surface water |
| Ash Township | Monroe | 5,959 | Community | Purchased surface water |
| Dundee | Monroe | 5,400 | Community | Purchased surface water |
| South Rockwood | Monroe | 1,587 | Community | Purchased surface water |
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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, “Monroe, PWSID MI0004450, Michigan”, https://aquacensus.com/water-systems/michigan/monroe-mi0004450 (data as of October 1, 2026).