Ohio
Water Quality Report
84 Good
Average Score
84/100
Water Systems
578
Population
10.1M
Violations
982 199 unresolved
Score Distribution
137 A
47 B
16 C
5 D
6 F
Top Contaminant Violations
| Contaminant | Violations |
|---|---|
| Copper (90th percentile) | 3 |
Lowest Scoring Water Systems
0
Kings Island Pws F
OH8345615 Kings Island, OH 31,753 served
0
Northwestern W And Sd - Mccomb F
OH3200411 Bowling Green, OH 1,527 served
6
Mansfield City F
OH7002914 Mansfield, OH 51,000 served
10
Alliance City Pws F
OH7600011 Alliance, OH 22,232 served
35
Steubenville, City Of F
OH4102411 Steubenville, OH 17,000 served
Counties in Ohio
Cities in Ohio
View all 417 cities →Popular City Comparisons in Ohio
Quickly compare major cities in Ohio by water quality score and grade.
Frequently Asked Questions
Is tap water in Ohio safe to drink?
Ohio has an average WaterQ score of 84/100 across 578 public water systems. Safety can vary by city and system, so check your local report for recent violations and contaminants.
How many water systems are in Ohio?
WaterQ currently tracks 578 public water systems in Ohio.
Where can I compare cities in Ohio?
Use the city list below to open detailed reports, or visit the compare tool to benchmark two cities side-by-side on score, grade, and system coverage.