A85/100
FLAT ROCK — Water Quality Report 2026
Serving 10,541 people · Michigan
Water Source
Purchased Surface Water
County
—
System ID
MI0002300
Violations
4
Contaminant Test Results
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
Frequently Asked Questions About FLAT ROCK
Is FLAT ROCK water safe to drink?
FLAT ROCK water receives a grade of A (85/100), which is considered excellent. Out of 34 contaminants tested, none exceed EPA legal limits. 1 contaminant(s) exceed non-enforceable health goals. The water meets federal safety standards.
What contaminants has FLAT ROCK detected?
34 contaminants were tested in FLAT ROCK's water. Notable contaminants include Lead (90th percentile). No contaminants exceed EPA legal limits. 1 exceed EPA health goals (MCLGs).
Does FLAT ROCK have any EPA violations?
Yes, FLAT ROCK has 4 EPA violation(s) on record, with the most recent in 2025. Violation types include TT, MR. 2 are health-based violations.
How many people does FLAT ROCK serve?
FLAT ROCK serves approximately 10,541 people, Michigan. The system provides water to 1 community: Flat Rock.
What type of water does FLAT ROCK provide?
FLAT ROCK sources its water from purchased surface water. Surface water comes from rivers, lakes, or reservoirs and typically requires more extensive treatment. The utility's system ID is MI0002300.
How does FLAT ROCK compare to other utilities in Michigan?
FLAT ROCK scores 85/100 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.