Joliet, Illinois Water Quality Report
Water quality data for 15 water systems serving 166,954 people.
Water Source
Detected Contaminants
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Compliance & Violations
Active Violations (49)
75
Aug 22, 2025
75
Aug 22, 2025
75
Jul 12, 2025
4H
Jul 2, 2025
4H
Jul 2, 2025
4H
Jul 2, 2025
4H
Jul 2, 2025
4H
Jul 2, 2025
4H
Jul 2, 2025
72
Jul 1, 2025
72
Jul 1, 2025
71
Jul 1, 2025
72
Jul 1, 2025
72
Jul 1, 2025
2E
Oct 17, 2024
4G
Oct 17, 2024
4G
Oct 17, 2024
2E
Oct 17, 2024
2E
Oct 17, 2024
4G
Oct 17, 2024
2E
Oct 17, 2024
4G
Oct 17, 2024
2E
Oct 17, 2024
75
Oct 16, 2024
75
Oct 11, 2024
75
Aug 28, 2024
75
Aug 28, 2024
75
Aug 15, 2024
75
Aug 13, 2024
75
Jul 20, 2024
75
Jul 20, 2024
71
Jul 1, 2024
72
Jul 1, 2024
75
Apr 14, 2024
75
Apr 12, 2024
75
Mar 29, 2024
75
Mar 29, 2024
75
Feb 25, 2024
75
Feb 25, 2024
75
Feb 9, 2024
75
Feb 9, 2024
75
Feb 9, 2024
75
Feb 9, 2024
75
Feb 9, 2024
75
Feb 9, 2024
75
Feb 9, 2024
75
Feb 9, 2024
75
Feb 9, 2024
75
Feb 9, 2024
Resolved Violations (451)
27
Aug 1, 2025 — Aug 31, 2025
3A
Aug 1, 2025 — Aug 31, 2025
72
Jul 1, 2025
03
Jul 1, 2025 — Sep 30, 2025
71
Jul 1, 2025
+ 446 more resolved violations
Frequently Asked Questions
Is Joliet tap water safe to drink?
Joliet's water meets all EPA maximum contaminant levels. However, 2 contaminants were detected at various levels. Some residents may prefer additional filtration for peace of mind.
What contaminants are in Joliet tap water?
2 contaminants have been detected in Joliet's water supply across 15 water systems. See the full contaminant table above for details.
How can I improve my water quality in Joliet?
Install a water filter rated for the specific contaminants found in Joliet's water. See our filter recommendations above. You can also request your utility's Consumer Confidence Report for the most current test results.
Does Joliet have any water quality violations?
Yes, Joliet currently has 411 active violations. See the violations section above for details.