C41/100
WARREN COUNTY — Water Quality Report 2026
Serving 78,299 people · Ohio
Water Source
Groundwater
County
—
System ID
OH8301512
Violations
48
Contaminant Test Results
2 contaminants above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Copper (90th percentile) | 708.00 mg/L | 1.30 mg/L | Over Limit |
Lead (90th percentile) | 0.001 mg/L | 0.015 mg/L | Above Goal |
EPA Violation History
2
Violations (last 5yr)
0
Unresolved
0
Health-Related
TIER 3Resolved
Surface water treatment technique failure
When: September 5, 2024 – October 25, 2024Enforcement: Resolving — corrective action underway
TIER 3Resolved
Surface water treatment technique failure
When: August 17, 2022 – December 8, 2022Enforcement: 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 WARREN COUNTY
Is WARREN COUNTY water safe to drink?
WARREN COUNTY water receives a grade of C (41/100), which is considered fair. 1 contaminant(s) exceed EPA legal limits and 48 violation(s) are on record. Customers may want to consider using a water filter.
What contaminants has WARREN COUNTY detected?
67 contaminants were tested in WARREN COUNTY's water. Notable contaminants include Copper (90th percentile), Lead (90th percentile). 1 exceed EPA legal limits (MCLs). 2 exceed EPA health goals (MCLGs).
Does WARREN COUNTY have any EPA violations?
Yes, WARREN COUNTY has 48 EPA violation(s) on record, with the most recent in 2024. Violation types include Other, MR.
How many people does WARREN COUNTY serve?
WARREN COUNTY serves approximately 78,299 people, Ohio.
What type of water does WARREN COUNTY provide?
WARREN COUNTY sources its water from groundwater. Groundwater is pumped from underground aquifers, which often provides natural filtration. The utility's system ID is OH8301512.
How does WARREN COUNTY compare to other utilities in Ohio?
WARREN COUNTY scores 41/100 with a grade of C (fair). This score indicates room for improvement compared to other utilities. Visit our Ohio state page for a full comparison of water systems.