Ohio
Water Quality Report
87 Good
Average Score
87/100
Water Systems
602
Population
10.4M
Violations
0 all resolved
Score Distribution
6 A
2 B
0 C
0 D
0 F
Top Contaminant Violations
| Contaminant | Violations |
|---|---|
| Tetrachloroethylene (PCE) | 1 |
| Nitrite | 1 |
| Copper | 1 |
| Gross Alpha Particle Activity | 1 |
Lowest Scoring Water Systems
89
City of Columbus Division of Water B
OH2510001 Columbus, OH 905,748 served
89
City of Toledo Water Treatment B
OH4810001 Toledo, OH 270,871 served
93
Greater Cincinnati Water Works A
OH3110001 Cincinnati, OH 309,317 served
93
Northeast Ohio Regional Sewer District A
OH1810002 Cleveland, OH 300,000 served
93
Dublin Water Services A
OH2510002 Columbus, OH 50,000 served
Counties in Ohio
Cities in Ohio
View all 431 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 87/100 across 602 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 602 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.