C51/100
HILLSBORO CITY — Water Quality Report 2026
Serving 6,650 people · Ohio
Water Source
Surface Water
County
—
System ID
OH3600614
Violations
17
Contaminant Test Results
1 contaminant above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Copper (90th percentile) | 194.00 mg/L | 1.30 mg/L | Over Limit |
EPA Violation History
2
Violations (last 5yr)
0
Unresolved
0
Health-Related
TIER 3Resolved
Surface water treatment technique failure
When: September 5, 2024 – February 10, 2025Enforcement: 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: April 1, 2022 – June 1, 2022Rule: Stage 1 DBPREnforcement: 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 HILLSBORO CITY
Is HILLSBORO CITY water safe to drink?
HILLSBORO CITY water receives a grade of C (51/100), which is considered fair. 1 contaminant(s) exceed EPA legal limits and 17 violation(s) are on record. Customers may want to consider using a water filter.
What contaminants has HILLSBORO CITY detected?
32 contaminants were tested in HILLSBORO CITY's water. Notable contaminants include Copper (90th percentile). 1 exceed EPA legal limits (MCLs). 1 exceed EPA health goals (MCLGs).
Does HILLSBORO CITY have any EPA violations?
Yes, HILLSBORO CITY has 17 EPA violation(s) on record, with the most recent in 2024. Violation types include Other, MR, MON. 6 are health-based violations.
How many people does HILLSBORO CITY serve?
HILLSBORO CITY serves approximately 6,650 people, Ohio.
What type of water does HILLSBORO CITY provide?
HILLSBORO CITY 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 OH3600614.
How does HILLSBORO CITY compare to other utilities in Ohio?
HILLSBORO CITY scores 51/100 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.