Public water system · MI0003726
ActiveSouthwest Michigan Regional Sanitary Sew
At a glance
Southwest Michigan Regional Sanitary Sew (PWSID MI0003726) is an active community water system in Berrien County, Michigan. It reports serving 26,780 people through 10,712 service connections. Its primary water source is purchased surface water, and EPA lists it as owned by a local government. EPA's records list one violation for this system; it is not health-based, and the most recent began in July 2025.
This page covers its drinking water system only; sewer and wastewater service are not part of EPA's drinking water records.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
26,780
Service connections
10,712
Primary source
SWP
Purchased surface water
System type
CWS
Community water system
System record
How does Southwest Michigan Regional Sanitary Sew compare with other water systems in Berrien County?
By EPA's size categories, Southwest Michigan Regional Sanitary Sew is a large system (10,001 to 100,000 people). Berrien County has 196 active public water systems, and Southwest Michigan Regional Sanitary Sew is the largest of them by population served. Its population served is about 40 times the county average of 669 people per system, and accounts for 20% of the 131,038 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 Southwest Michigan Regional Sanitary Sew is about 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. Purchased surface water means the system buys surface water from another public water system rather than drawing its own. 262 Michigan systems (2.5%) list purchased surface water as their primary source.
Who owns and regulates Southwest Michigan Regional Sanitary Sew?
EPA lists Southwest Michigan Regional Sanitary Sew 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. 24 of the 196 active systems in Berrien County (12%) are also owned by a local government.
Does Southwest Michigan Regional Sanitary Sew have drinking water violations?
EPA's records list one violation for this system; it is not health-based, and the most recent began in July 2025. By type: 1 reporting. The contaminant or rule involved is Lead and Copper Rule Revisions. EPA lists 1 as unaddressed. Unaddressed means the violation is not resolved or archived and is not yet covered by formal enforcement.
| Began | Violation | Contaminant or rule | Health-based | Status |
|---|---|---|---|---|
| 2025-07-02 | ReportingNotification, Known or Potential LSL · code 4H | Lead and Copper Rule Revisionscode 5200 | No | Unaddressed |
The one violation in EPA's records.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.
Southwest Michigan Regional Sanitary Sew: frequently asked questions
Who runs Southwest Michigan Regional Sanitary Sew?
Southwest Michigan Regional Sanitary Sew (PWSID MI0003726) is a community water system owned by a local government. It is regulated by the MI state drinking water program.
How many people does Southwest Michigan Regional Sanitary Sew serve?
Southwest Michigan Regional Sanitary Sew reports serving 26,780 people through 10,712 service connections in Berrien County, Michigan.
Where does Southwest Michigan Regional Sanitary Sew get its water?
EPA SDWIS lists this system's primary water source as purchased surface water. Purchased surface water means the system buys surface water from another public water system rather than drawing its own.
Does Southwest Michigan Regional Sanitary Sew have any drinking water violations?
EPA's records list one violation for this system; it is not health-based, and the most recent began in July 2025. 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 Southwest Michigan Regional Sanitary Sew'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 one violation for this system; it is not health-based, and the most recent began in July 2025. For current results, consult the system's annual water quality report, EPA ECHO, or the MI state drinking water program.
Where can I find Southwest Michigan Regional Sanitary Sew's water quality report?
As a community water system, Southwest Michigan Regional Sanitary Sew 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 Berrien County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Niles | Berrien | 14,215 | Community | Groundwater |
| Benton Harbor | Berrien | 9,103 | Community | Surface water |
| St Joseph | Berrien | 7,930 | Community | Surface water |
| Benton Charter Township | Berrien | 6,768 | Community | Surface water |
| Buchanan | Berrien | 4,871 | Community | Groundwater |
| Lake Charter Township | Berrien | 4,177 | Community | 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, “Southwest Michigan Regional Sanitary Sew, PWSID MI0003726, Michigan”, https://aquacensus.com/water-systems/michigan/southwest-michigan-regional-sanitary-sew-mi0003726 (data as of October 1, 2026).