B71/100
ONTARIO CITY — Water Quality Report 2026
Serving 6,656 people · Ohio
Water Source
Groundwater
County
—
System ID
OH7003512
Violations
18
Contaminant Test Results
2 contaminants above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Copper (90th percentile) | 253.00 mg/L | 1.30 mg/L | Over Limit |
Lead (90th percentile) | 0.003 mg/L | 0.015 mg/L | Above Goal |
EPA Violation History
No violations in the past 5 years
Full EPA compliance since 2018.
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 ONTARIO CITY
Is ONTARIO CITY water safe to drink?
ONTARIO CITY water receives a grade of B (71/100), which is considered good. Out of 52 contaminants tested, 1 exceed EPA legal limits. 2 contaminant(s) exceed non-enforceable health goals. The water meets federal safety standards.
What contaminants has ONTARIO CITY detected?
52 contaminants were tested in ONTARIO CITY's water. Notable contaminants include Copper (90th percentile), Lead (90th percentile). 1 exceed EPA legal limits (MCLs). 2 exceed EPA health goals (MCLGs).
Does ONTARIO CITY have any EPA violations?
Yes, ONTARIO CITY has 18 EPA violation(s) on record, with the most recent in 2018. Violation types include Other, MR.
How many people does ONTARIO CITY serve?
ONTARIO CITY serves approximately 6,656 people, Ohio.
What type of water does ONTARIO CITY provide?
ONTARIO CITY sources its water from groundwater. Groundwater is pumped from underground aquifers, which often provides natural filtration. The utility's system ID is OH7003512.
How does ONTARIO CITY compare to other utilities in Ohio?
ONTARIO CITY scores 71/100 with a grade of B (good). This is an above-average performance for utilities statewide. Visit our Ohio state page for a full comparison of water systems.