Public water system · MI0006284
ActiveSt. Clair Water and Sewer Authority
At a glance
St. Clair Water and Sewer Authority (PWSID MI0006284) is an active community water system in St. Clair County, Michigan. It reports serving 5,847 people through 3,500 service connections. Its primary water source is surface water, and EPA lists it as owned by a local government. EPA's Safe Drinking Water Act records list no violations for this system.
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
5,847
Service connections
3,500
Primary source
SW
Surface water
System type
CWS
Community water system
System record
How does St. Clair Water and Sewer Authority compare with other water systems in St. Clair County?
By EPA's size categories, St. Clair Water and Sewer Authority is a medium system (3,301 to 10,000 people). St. Clair County has 96 active public water systems, and St. Clair Water and Sewer Authority is the 6th-largest of them by population served. Its population served is about 4.7 times the county average of 1,246 people per system, and accounts for 4.9% of the 119,605 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 St. Clair Water and Sewer Authority is about 13% 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. 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 St. Clair Water and Sewer Authority?
EPA lists St. Clair Water and Sewer Authority 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. 18 of the 96 active systems in St. Clair County (19%) are also owned by a local government.
Does St. Clair Water and Sewer Authority have drinking water violations?
No SDWA violations on record.
EPA's SDWA violation and enforcement data (via EPA ECHO, updated quarterly) lists no violations for St. Clair Water and Sewer Authority. For the latest compliance status, check EPA ECHO for current compliance history.
St. Clair Water and Sewer Authority: frequently asked questions
Who runs St. Clair Water and Sewer Authority?
St. Clair Water and Sewer Authority (PWSID MI0006284) is a community water system owned by a local government. It is regulated by the MI state drinking water program.
How many people does St. Clair Water and Sewer Authority serve?
St. Clair Water and Sewer Authority reports serving 5,847 people through 3,500 service connections in St. Clair County, Michigan.
Where does St. Clair Water and Sewer Authority 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 St. Clair Water and Sewer Authority have any drinking water violations?
EPA's Safe Drinking Water Act records list no violations for this system.
Is St. Clair Water and Sewer Authority'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 Safe Drinking Water Act records list no violations for this system. For current results, consult the system's annual water quality report, EPA ECHO, or the MI state drinking water program.
Where can I find St. Clair Water and Sewer Authority's water quality report?
As a community water system, St. Clair Water and Sewer Authority 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 St. Clair County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Port Huron, City of | St. Clair | 28,983 | Community | Surface water |
| Port Huron Township | St. Clair | 10,654 | Community | Purchased surface water |
| Marysville, City of | St. Clair | 9,959 | Community | Surface water |
| Clay Township | St. Clair | 9,866 | Community | Purchased surface water |
| Ira Township | St. Clair | 6,510 | Community | Surface water |
| St. Clair, City of | St. Clair | 5,464 | 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, “St. Clair Water and Sewer Authority, PWSID MI0006284, Michigan”, https://aquacensus.com/water-systems/michigan/st-clair-water-and-sewer-authority-mi0006284 (data as of October 1, 2026).