A85/100
Flat Rock Tap Water Quality: Is It Safe to Drink? (2026 Report)
Serving 10,541 residents · Michigan
What's In Flat Rock's Tap Water?
34
Contaminants Tested
0
Exceed EPA Limits
1
Above EPA Goals
1 contaminant above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Lead (90th percentile) | 0.005 mg/L | 0.015 mg/L | Above Goal |
EPA Violation History
2
Violations (last 5yr)
1
Unresolved
2
Health-Related
TIER 2Unresolved
Failed treatment technique requirements
TIER 2Resolved
Failed treatment technique requirements
When: August 1, 2022 – September 30, 2022Rule: Surface Water Treatment RuleEnforcement: Resolving — corrective action underway
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
FLAT ROCK
Population Served
10,541
Water Source
Purchased Surface Water
System ID
MI0002300
Frequently Asked Questions About Flat Rock Water
Is Flat Rock tap water safe to drink?
Flat Rock, Michigan tap water receives a grade of A (85/100), which is considered excellent. Out of 34 contaminants tested, none exceed EPA maximum contaminant levels (MCLs) and 1 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 Flat Rock's water?
Of the 34 contaminants tested in Flat Rock's water supply, the most notable include Lead (90th percentile). No contaminants exceed EPA legal limits. 1 contaminant(s) exceed EPA health goals (MCLGs), which are non-enforceable targets set at levels with no known health risk.
Does Flat Rock have any water quality violations?
Yes, Flat Rock has 4 EPA violation(s) on record, with the most recent in 2025. Violation types include TT, MR. 2 of these are health-based violations, which are the most serious category.
Do I need a water filter in Flat Rock?
Flat Rock water meets EPA standards, so a filter is not strictly necessary. However, some residents prefer the added security of a water filter. EPA health goals (MCLGs) are stricter than legal limits and are set at levels with zero expected health risk. 1 contaminant(s) exceed these stricter goals.
Where does Flat Rock's tap water come from?
Flat Rock's drinking water is sourced from purchased surface water and supplied by FLAT ROCK. The system serves approximately 10,541 people. Surface water sources include rivers, lakes, and reservoirs.
How often is Flat Rock'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. Flat Rock'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 Flat Rock's water compare to other cities in Michigan?
Flat Rock's water quality score of 85/100 earns a grade of A, which is considered excellent. This places Flat Rock 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 Flat Rock's water quality?
If you have concerns about Flat Rock'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 (FLAT ROCK) 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.