Chicago, Illinois Water Quality Report
Water quality data for 39 water systems serving 2,758,118 people.
Water Source
Detected Contaminants
| Contaminant | Detected Level | EPA Limit (MCL) | Health Guideline | % of Limit | Status |
|---|---|---|---|---|---|
| lithium | 32.0 | No federal limit | 10.0 ug/L(EPA/USGS HBSL) | 320% | Above guideline |
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Compliance & Violations
Active Violations (18)
4H
Jul 2, 2025
4H
Jul 2, 2025
4H
Jul 2, 2025
4H
Jul 2, 2025
72
Jul 1, 2025
72
Jul 1, 2025
72
Jul 1, 2025
72
Jul 1, 2025
72
Jul 1, 2025
75
Jun 15, 2025
2E
Apr 1, 2025
4G
Apr 1, 2025
75
Oct 17, 2024
2E
Oct 17, 2024
75
Oct 17, 2024
71
Jul 1, 2024
75
Oct 1, 2023
75
Apr 27, 2023
Resolved Violations (482)
02
Jul 1, 2025 — Sep 30, 2025
72
Jul 1, 2025
02
Jul 1, 2025 — Sep 30, 2025
03
Jul 1, 2025 — Sep 30, 2025
72
Jul 1, 2025
+ 477 more resolved violations
Frequently Asked Questions
Is Chicago tap water safe to drink?
Chicago's water meets all EPA maximum contaminant levels. However, 1 contaminants were detected at various levels. Some residents may prefer additional filtration for peace of mind.
What contaminants are in Chicago tap water?
1 contaminants have been detected in Chicago's water supply across 39 water systems. See the full contaminant table above for details.
How can I improve my water quality in Chicago?
Install a water filter rated for the specific contaminants found in Chicago's water. See our filter recommendations above. You can also request your utility's Consumer Confidence Report for the most current test results.
Does Chicago have any water quality violations?
Yes, Chicago currently has 378 active violations. See the violations section above for details.