Cincinnati, Ohio Water Quality Report
Water quality data for 15 water systems serving 779,067 people.
Water Source
Detected Contaminants
| Contaminant | Detected Level | EPA Limit (MCL) | Health Guideline | % of Limit | Status |
|---|---|---|---|---|---|
| lithium | 11.1 | No federal limit | 10.0 ug/L(EPA/USGS HBSL) | 111% | Above guideline |
| PFBA | 0.006 | No federal limit | 1000.0 ug/L(EWG) | 0% | Below guideline |
| PFBS | 0.004 | No federal limit | 2000.0 ug/L(EPA Health Advisory) | 0% | Below guideline |
| PFHxA | 0.003 | No federal limit | 1000.0 ug/L(EWG) | 0% | Below guideline |
| PFOS | 0.012 | 0.004 ug/L | 0.300 ug/L(EWG) | 310% | Above limit |
| PFPeA | 0.005 | No federal limit | 1000.0 ug/L(EWG) | 0% | Below guideline |
Recommended Water Filters
Based on the contaminants detected in your water supply, these filtration systems are recommended:
Reverse Osmosis (RO)
Reverse osmosis systems remove up to 99% of PFAS compounds. Recommended for homes with detected PFAS.
Up to 99% PFAS removal
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Compliance & Violations
Active Violations (15)
71
Jul 1, 2025
2E
Oct 17, 2024
2E
Oct 17, 2024
72
Oct 7, 2024
72
Oct 7, 2024
72
Oct 7, 2024
71
Jul 1, 2024
72
Oct 1, 2023
71
Jul 1, 2023
71
Jul 1, 2023
71
Jul 1, 2022
72
Dec 22, 2021
72
Oct 21, 2020
72
Feb 11, 2020
72
Nov 8, 2018
Resolved Violations (485)
12
Sep 4, 2025
12
Sep 4, 2025
12
Sep 4, 2025
12
Sep 4, 2025
2E
Oct 17, 2024
+ 480 more resolved violations
Frequently Asked Questions
Is Cincinnati tap water safe to drink?
Cincinnati's water has 1 contaminant detected above EPA limits. While the water is treated, residents may want to consider additional filtration.
What contaminants are in Cincinnati tap water?
6 contaminants have been detected in Cincinnati's water supply across 15 water systems. See the full contaminant table above for details.
How can I improve my water quality in Cincinnati?
Install a water filter rated for the specific contaminants found in Cincinnati's water. See our filter recommendations above. You can also request your utility's Consumer Confidence Report for the most current test results.
Does Cincinnati have any water quality violations?
Yes, Cincinnati currently has 82 active violations. See the violations section above for details.