Public water system · MI0006110
ActiveSouth Lyon, City of
At a glance
City of South Lyon (PWSID MI0006110) is an active community water system in Oakland County, Michigan. It reports serving 11,055 people through 3,454 service connections. Its primary water source is groundwater, 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 January 2008.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
11,055
Service connections
3,454
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does City of South Lyon compare with other water systems in Oakland County?
By EPA's size categories, City of South Lyon is a large system (10,001 to 100,000 people). Oakland County has 734 active public water systems. Its population served is about 7.1 times the county average of 1,561 people per system, and accounts for 1% of the 1,145,905 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 South Lyon is about 65% 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. 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 South Lyon?
EPA lists City of South Lyon 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. 56 of the 734 active systems in Oakland County (7.6%) are also owned by a local government.
Does City of South Lyon have drinking water violations?
EPA's records list one violation for this system; it is not health-based, and the most recent began in January 2008. By type: 1 monitoring and reporting. The contaminant or rule involved is Haloacetic acids (HAA5). EPA lists 1 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 |
|---|---|---|---|---|
| 2008-01-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Haloacetic acids (HAA5)code 2456 | No | Resolved |
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.
City of South Lyon: frequently asked questions
Who runs City of South Lyon?
City of South Lyon (PWSID MI0006110) 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 South Lyon serve?
City of South Lyon reports serving 11,055 people through 3,454 service connections in Oakland County, Michigan.
Where does City of South Lyon 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 South Lyon 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 January 2008. 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 South Lyon'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 January 2008. 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 South Lyon's water quality report?
As a community water system, City of South Lyon 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 Oakland County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Troy | Oakland | 85,854 | Community | Purchased surface water |
| Rochester Hills | Oakland | 74,000 | Community | Purchased surface water |
| Waterford Township | Oakland | 73,441 | Community | Groundwater |
| Southfield | Oakland | 71,739 | Community | Purchased surface water |
| Pontiac | Oakland | 63,776 | Community | Purchased surface water |
| Royal Oak, City of | Oakland | 57,236 | 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, “South Lyon, City of, PWSID MI0006110, Michigan”, https://aquacensus.com/water-systems/michigan/south-lyon-city-of-mi0006110 (data as of October 1, 2026).