St. Charles, Illinois Water Quality Report
Water quality data for 11 water systems serving 44,517 people.
Water Source
Detected Contaminants
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 (12)
4H
Jul 2, 2025
4H
Jul 2, 2025
72
Jul 1, 2025
72
Jul 1, 2025
71
Jul 1, 2025
72
Jul 1, 2025
2E
Oct 17, 2024
2E
Oct 17, 2024
2E
Oct 17, 2024
2E
Oct 17, 2024
2E
Oct 17, 2024
2E
Oct 17, 2024
Resolved Violations (488)
03
Jul 1, 2025 — Sep 30, 2025
71
Jul 1, 2024
03
Jul 1, 2024 — Sep 30, 2024
03
Jul 1, 2024 — Sep 30, 2024
03
Jul 1, 2024 — Sep 30, 2024
+ 483 more resolved violations
Frequently Asked Questions
Is St. Charles tap water safe to drink?
St. Charles'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 St. Charles tap water?
2 contaminants have been detected in St. Charles's water supply across 11 water systems. See the full contaminant table above for details.
How can I improve my water quality in St. Charles?
Install a water filter rated for the specific contaminants found in St. Charles's water. See our filter recommendations above. You can also request your utility's Consumer Confidence Report for the most current test results.
Does St. Charles have any water quality violations?
Yes, St. Charles currently has 156 active violations. See the violations section above for details.