Official EPA SDWIS Statewide AnalysisState Water Quality & Testing Directory
Ohio Drinking Water Quality & Testing Directory
Comprehensive EPA compliance records, water testing guidelines, and city rankings covering all 1,435 ZIP codes across Ohio
Quick Summary: Is Tap Water Safe in Ohio?
Drinking water in Ohio receives an average composite safety score of 59.5/100 based on EPA Safe Drinking Water Act records. Approximately 0% of monitored ZIP codes earn an "A" grade. Water sources are 49.5% surface water and 50.5% groundwater, resulting in Hard to Very Hard mineral hardness across the state.
Total ZIP Codes
1,435
Health Violations (5yr)
515
Statewide Avg Score
59.5/100
High Lead Risk Areas
70.8%
Overview: Drinking Water in Ohio
Drinking water quality in Ohio averages a composite safety score of 59.5/100 across its 1,435 monitored ZIP codes. Approximately 0% of ZIP codes in the state receive an "A" grade, while 3% receive an "F" grade. Environmental standards are enforced by Ohio Environmental Protection Agency.
Surface Water
49.5%
of ZIP codes
Total Violations
2,908
5-year record
Grade A ZIPs
0
0% of state
Grade F ZIPs
39
3% of state
Water Quality Grade Distribution in Ohio
How do Ohio's 1,435 ZIP codes stack up by water quality grade?
A
0 ZIP codes0%
B
316 ZIP codes22%
C
602 ZIP codes42%
D
478 ZIP codes33%
F
39 ZIP codes3%
Popular Cities in Ohio
Click any city to view ZIP code-level water quality reports
Cincinnati
71 ZIPs
C
Dayton
49 ZIPs
F
Columbus
46 ZIPs
C
Cleveland
41 ZIPs
B
Toledo
31 ZIPs
B
Akron
29 ZIPs
C
Canton
18 ZIPs
C
Youngstown
15 ZIPs
B
Mansfield
8 ZIPs
C
Warren
7 ZIPs
B
Hamilton
6 ZIPs
C
Springfield
6 ZIPs
C
Lima
6 ZIPs
C
Groveport
4 ZIPs
C
Marion
4 ZIPs
C
Newark
3 ZIPs
C
Westerville
3 ZIPs
C
Lorain
3 ZIPs
B
Euclid
3 ZIPs
C
Cuyahoga Falls
3 ZIPs
C
Kent
3 ZIPs
B
Massillon
3 ZIPs
C
Middletown
3 ZIPs
C
Marysville
2 ZIPs
C
Dublin
2 ZIPs
C
Hebron
2 ZIPs
C
Reynoldsburg
2 ZIPs
C
Lockbourne
2 ZIPs
C
Bowling Green
2 ZIPs
B
Perrysburg
2 ZIPs
B
Zanesville
2 ZIPs
C
Oregon
2 ZIPs
B
Steubenville
2 ZIPs
C
Ashtabula
2 ZIPs
B
Chagrin Falls
2 ZIPs
B
Elyria
2 ZIPs
D
Mentor
2 ZIPs
B
Eastlake
2 ZIPs
D
Willoughby
2 ZIPs
D
Strongsville
2 ZIPs
B
City A-Z Directory — Ohio
Browse water quality reports for every town and city in Ohio.
🏆 Highest Rated ZIP Codes in Ohio
⚠ Lowest Rated ZIP Codes in Ohio
Common Drinking Water Contaminants in Ohio
The following are common regulated contaminants found in Ohio drinking water based on EPA violation records. Click any contaminant to learn about EPA safety limits and health effects.
Stage 2 DBP RuleConsumer Confidence Report RuleFecal ColiformHaloacetic Acids (HAA5)Contaminant 0700Contaminant 0800Stage 1 DBP RuleTotal Trihalomethanes (TTHM)
Source: EPA Safe Drinking Water Act Maximum Contaminant Level regulations. For the complete list of regulated contaminants and MCLs, see the Water Quality Safety Guide.
Frequently Asked Questions — Ohio Drinking Water
Is tap water generally safe to drink in Ohio?+
Yes, for the majority of residents, tap water in Ohio is treated and regulated. However, compliance varies by city. State-wide, 0 ZIP codes receive an "A" grade, while 39 receive an "F". Search your specific ZIP code to see your local utility's record.
How do I test water quality or well water in Ohio?+
Residents in Ohio can test their tap or well water by contacting laboratories certified by Ohio Environmental Protection Agency or ordering an EPA-standard laboratory water testing kit. Annual testing is recommended for private wells to test for bacteria, nitrates, and heavy metals.
What are the biggest water quality issues in Ohio?+
The primary issues include managing 515 health-based violations state-wide and resolving infrastructure age. 70.8% of ZIP codes in the state have a high probability of lead exposure risk due to pre-1986 piping.
Who regulates and enforces drinking water standards in Ohio?+
Drinking water in Ohio is regulated by Ohio Environmental Protection Agency under a primacy agreement with the U.S. EPA.
Where does Ohio get its drinking water?+
Approximately 49.5% of monitored areas in Ohio rely on surface water sources (lakes/rivers), while the rest use groundwater aquifers.
How do I find the official water quality report for my home in Ohio?+
Search your ZIP code on our site to view data compiled from EPA records, or contact your local utility for their annual Consumer Confidence Report (CCR).
View All 1,435 ZIP Codes in Ohio
Browse EPA water quality data for every monitored ZIP code. For faster results, use the search bar above.
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All 1,435 ZIP codes in Ohio are actively monitored under the EPA Safe Drinking Water Act.