A88/100
OWOSSO, CITY OF — Water Quality Report 2026
Serving 16,353 people · Michigan
Water Source
Surface Water
County
—
System ID
MI0005120
Violations
5
Contaminant Test Results
1 contaminant above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Lead (90th percentile) | 0.009 mg/L | 0.015 mg/L | Above Goal |
EPA Violation History
4
Violations (last 5yr)
0
Unresolved
1
Health-Related
TIER 3Resolved
Failed Level 2 Assessment under Revised Total Coliform Rule
This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.
When: January 1, 2023 – December 31, 2023Rule: Stage 2 DBPREnforcement: Resolving — corrective action underway
TIER 3Resolved
Failed Level 2 Assessment under Revised Total Coliform Rule
This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.
When: January 1, 2023 – December 31, 2023Rule: Stage 2 DBPREnforcement: Resolving — corrective action underway
TIER 2Resolved
Maximum contaminant level violation
When: November 13, 2022 – November 14, 2022Rule: Total Coliform RuleEnforcement: Resolving — corrective action underway
TIER 3Resolved
Failed to conduct Level 1 Assessment
This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.
When: October 14, 2022 – November 8, 2022Rule: Consumer Confidence 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 OWOSSO, CITY OF
Is OWOSSO, CITY OF water safe to drink?
OWOSSO, CITY OF water receives a grade of A (88/100), which is considered excellent. Out of 66 contaminants tested, none exceed EPA legal limits. 1 contaminant(s) exceed non-enforceable health goals. The water meets federal safety standards.
What contaminants has OWOSSO, CITY OF detected?
66 contaminants were tested in OWOSSO, CITY OF's water. Notable contaminants include Lead (90th percentile). No contaminants exceed EPA legal limits. 1 exceed EPA health goals (MCLGs).
Does OWOSSO, CITY OF have any EPA violations?
Yes, OWOSSO, CITY OF has 5 EPA violation(s) on record, with the most recent in 2023. Violation types include MR, TT, Other. 1 are health-based violations.
How many people does OWOSSO, CITY OF serve?
OWOSSO, CITY OF serves approximately 16,353 people, Michigan. The system provides water to 1 community: Owosso.
What type of water does OWOSSO, CITY OF provide?
OWOSSO, CITY OF sources its water from surface water. Surface water comes from rivers, lakes, or reservoirs and typically requires more extensive treatment. The utility's system ID is MI0005120.
How does OWOSSO, CITY OF compare to other utilities in Michigan?
OWOSSO, CITY OF scores 88/100 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.