A91/100
CINCINNATI PUBLIC WATER SYSTEM — Water Quality Report 2026
Serving 750,200 people · Ohio
Water Source
Surface Water
County
—
System ID
OH3102612
Violations
0
Contaminant Test Results
3 contaminants above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Copper (90th percentile) | 37.60 mg/L | 1.30 mg/L | Over Limit |
1,4-dioxane | 0.580 µg/L | — | Above Goal |
Lead (90th percentile) | 0.002 mg/L | 0.015 mg/L | Above Goal |
EPA Violation History
No violations in the past 5 years
This system has a clean compliance history.
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 CINCINNATI PUBLIC WATER SYSTEM
Is CINCINNATI PUBLIC WATER SYSTEM water safe to drink?
CINCINNATI PUBLIC WATER SYSTEM water receives a grade of A (91/100), which is considered excellent. Out of 77 contaminants tested, 1 exceed EPA legal limits. 3 contaminant(s) exceed non-enforceable health goals. The water meets federal safety standards.
What contaminants has CINCINNATI PUBLIC WATER SYSTEM detected?
77 contaminants were tested in CINCINNATI PUBLIC WATER SYSTEM's water. Notable contaminants include Copper (90th percentile), Lead (90th percentile), 1,4-dioxane. 1 exceed EPA legal limits (MCLs). 3 exceed EPA health goals (MCLGs).
Does CINCINNATI PUBLIC WATER SYSTEM have any EPA violations?
No, CINCINNATI PUBLIC WATER SYSTEM has zero EPA violations on record. This indicates consistent compliance with federal drinking water standards.
How many people does CINCINNATI PUBLIC WATER SYSTEM serve?
CINCINNATI PUBLIC WATER SYSTEM serves approximately 750,200 people, Ohio.
What type of water does CINCINNATI PUBLIC WATER SYSTEM provide?
CINCINNATI PUBLIC WATER SYSTEM 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 OH3102612.
How does CINCINNATI PUBLIC WATER SYSTEM compare to other utilities in Ohio?
CINCINNATI PUBLIC WATER SYSTEM scores 91/100 with a grade of A (excellent). This places it among the higher-performing utilities in the state. Visit our Ohio state page for a full comparison of water systems.