Winthrop Harbor, Illinois Water Quality Report
Water quality data for 1 water system serving 6,565 people.
Water Source
Detected Contaminants
No contaminant data available for this location.
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Compliance & Violations
Active Violations (23)
72
Jul 1, 2025
72
Jul 1, 2024
72
Jul 1, 2023
66
Dec 30, 2022
66
Dec 30, 2021
75
Oct 21, 2021
Violation
Unknown
Violation
Unknown
Violation
Unknown
Violation
Unknown
Violation
Unknown
Violation
Unknown
Violation
Unknown
Violation
Unknown
Violation
Unknown
Violation
Unknown
Violation
Unknown
Violation
Unknown
Violation
Unknown
Violation
Unknown
Violation
Unknown
Violation
Unknown
Violation
Unknown
Resolved Violations (79)
75
Jan 12, 2025
75
Jan 12, 2025
75
Oct 11, 2024
75
Oct 11, 2024
75
Oct 11, 2024
+ 74 more resolved violations
Frequently Asked Questions
Is Winthrop Harbor tap water safe to drink?
Winthrop Harbor's water meets all EPA maximum contaminant levels. However, 0 contaminants were detected at various levels. Some residents may prefer additional filtration for peace of mind.
What contaminants are in Winthrop Harbor tap water?
0 contaminants have been detected in Winthrop Harbor's water supply across 1 water system. See the full contaminant table above for details.
How can I improve my water quality in Winthrop Harbor?
Install a water filter rated for the specific contaminants found in Winthrop Harbor's water. See our filter recommendations above. You can also request your utility's Consumer Confidence Report for the most current test results.
Does Winthrop Harbor have any water quality violations?
Yes, Winthrop Harbor currently has 23 active violations. See the violations section above for details.