A91/100
SOUTH LYON, CITY OF — Water Quality Report 2026
Serving 11,055 people · Michigan
Water Source
Groundwater
County
—
System ID
MI0006110
Violations
1
Contaminant Test Results
1 contaminant above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Copper (90th percentile) | 1.40 mg/L | 1.30 mg/L | Over Limit |
EPA Violation History
No violations in the past 5 years
Full EPA compliance since 2008.
Understanding violation severity
Tier 1Urgent health risk. Utility must notify all customers within 24 hours.Tier 2Important health or treatment issue. Customers notified within 30 days.Tier 3Administrative or monitoring issue. Reported in the annual water quality report.
Source: EPA Safe Drinking Water Information System (SDWIS) · Updated quarterly
Frequently Asked Questions About SOUTH LYON, CITY OF
Is SOUTH LYON, CITY OF water safe to drink?
SOUTH LYON, CITY OF water receives a grade of A (91/100), which is considered excellent. Out of 67 contaminants tested, 1 exceed EPA legal limits. 1 contaminant(s) exceed non-enforceable health goals. The water meets federal safety standards.
What contaminants has SOUTH LYON, CITY OF detected?
67 contaminants were tested in SOUTH LYON, CITY OF's water. Notable contaminants include Copper (90th percentile). 1 exceed EPA legal limits (MCLs). 1 exceed EPA health goals (MCLGs).
Does SOUTH LYON, CITY OF have any EPA violations?
Yes, SOUTH LYON, CITY OF has 1 EPA violation(s) on record, with the most recent in 2008. Violation types include MR.
How many people does SOUTH LYON, CITY OF serve?
SOUTH LYON, CITY OF serves approximately 11,055 people, Michigan. The system provides water to 1 community: South Lyon.
What type of water does SOUTH LYON, CITY OF provide?
SOUTH LYON, CITY OF sources its water from groundwater. Groundwater is pumped from underground aquifers, which often provides natural filtration. The utility's system ID is MI0006110.
How does SOUTH LYON, CITY OF compare to other utilities in Michigan?
SOUTH LYON, CITY OF scores 91/100 with a grade of A (excellent). This places it among the higher-performing utilities in the state. Visit our Michigan state page for a full comparison of water systems.