A89/100
South Lyon Tap Water Quality: Is It Safe to Drink? (2026 Report)
Serving 12,203 residents · Michigan
What's In South Lyon's Tap Water?
67
Contaminants Tested
1
Exceed EPA Limits
0
Above EPA Goals
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
Water Utility Details
HIDDEN LAKES OF GREEN OAKS
Population Served
1,148
Water Source
Groundwater
System ID
MI0003137
SOUTH LYON, CITY OF
Population Served
11,055
Water Source
Groundwater
System ID
MI0006110
Frequently Asked Questions About South Lyon Water
Is South Lyon tap water safe to drink?
South Lyon, Michigan tap water receives a grade of A (89/100), which is considered excellent. Out of 67 contaminants tested, 1 exceed EPA maximum contaminant levels (MCLs) and 2 exceed health guidelines (MCLGs). While the water meets federal standards, some residents may still choose to use a filter for additional peace of mind.
What contaminants are in South Lyon's water?
Of the 67 contaminants tested in South Lyon's water supply, the most notable include Copper (90th percentile), Lead (90th percentile). 1 contaminant(s) exceed EPA legal limits (MCLs). 2 contaminant(s) exceed EPA health goals (MCLGs), which are non-enforceable targets set at levels with no known health risk.
Does South Lyon have any water quality violations?
Yes, South Lyon has 2 EPA violation(s) on record, with the most recent in 2020. Violation types include Other, MR. None of these are classified as health-based violations.
Do I need a water filter in South Lyon?
Based on EPA data, using a water filter in South Lyon is recommended. 1 contaminant(s) exceed legal limits. An NSF-certified filter — such as a reverse osmosis or activated carbon system — can effectively reduce many common contaminants. Choose a filter certified to remove the specific contaminants found in your area.
Where does South Lyon's tap water come from?
South Lyon's drinking water is sourced from groundwater and supplied by HIDDEN LAKES OF GREEN OAKS and 1 other water system(s). The system serves approximately 12,203 people. Groundwater is pumped from underground aquifers, which often provides natural filtration.
How often is South Lyon's water tested?
Under the Safe Drinking Water Act (SDWA), water utilities are required to regularly test for over 90 contaminants. Testing frequency varies by contaminant — some are tested monthly, others quarterly or annually. South Lyon's water systems must report results to the EPA and publish an annual Consumer Confidence Report (CCR). The data on this page reflects the latest available EPA testing data.
How does South Lyon's water compare to other cities in Michigan?
South Lyon's water quality score of 89/100 earns a grade of A, which is considered excellent. This places South Lyon among the better-performing water systems in Michigan. Visit our Michigan state page to see how all cities in the state compare.
What should I do if I'm concerned about South Lyon's water quality?
If you have concerns about South Lyon's tap water, consider these steps: (1) Request your utility's annual Consumer Confidence Report for detailed local data. (2) Get your water independently tested through a state-certified laboratory. (3) Consider an NSF-certified water filter rated for the contaminants found in your area. (4) Contact your water utility (HIDDEN LAKES OF GREEN OAKS) with specific questions. (5) Report water quality issues to your state drinking water program or the EPA Safe Drinking Water Hotline at 800-426-4791.