Ottawa, Illinois Water Quality Report
Water quality data for 9 water systems serving 19,349 people.
Water Source
Detected Contaminants
| Contaminant | Detected Level | EPA Limit (MCL) | Health Guideline | % of Limit | Status |
|---|---|---|---|---|---|
| lithium | 13.1 | No federal limit | 10.0 ug/L(EPA/USGS HBSL) | 131% | Above guideline |
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Compliance & Violations
Active Violations (36)
75
Sep 26, 2025
75
Aug 30, 2025
75
Aug 30, 2025
75
Aug 22, 2025
75
Aug 20, 2025
75
Jul 31, 2025
4H
Jul 2, 2025
4H
Jul 2, 2025
4H
Jul 2, 2025
4H
Jul 2, 2025
71
Jul 1, 2025
75
Jun 7, 2025
75
Jun 7, 2025
75
Apr 19, 2025
57
Apr 2, 2025
75
Mar 26, 2025
75
Feb 21, 2025
75
Feb 21, 2025
75
Jan 26, 2025
75
Dec 18, 2024
75
Dec 7, 2024
75
Dec 7, 2024
75
Nov 6, 2024
75
Nov 6, 2024
4G
Oct 17, 2024
4G
Oct 17, 2024
2E
Oct 17, 2024
2E
Oct 17, 2024
75
Oct 11, 2024
71
Jul 1, 2024
71
Jul 1, 2024
75
Apr 11, 2024
75
Apr 11, 2024
52
Oct 1, 2023
52
Oct 1, 2023
75
May 19, 2023
Resolved Violations (464)
3A
Sep 1, 2025 — Sep 30, 2025
27
Sep 1, 2025 — Sep 30, 2025
27
Aug 1, 2025 — Aug 31, 2025
3A
Aug 1, 2025 — Aug 31, 2025
75
Jul 27, 2025
+ 459 more resolved violations
Frequently Asked Questions
Is Ottawa tap water safe to drink?
Ottawa'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 Ottawa tap water?
1 contaminants have been detected in Ottawa's water supply across 9 water systems. See the full contaminant table above for details.
How can I improve my water quality in Ottawa?
Install a water filter rated for the specific contaminants found in Ottawa's water. See our filter recommendations above. You can also request your utility's Consumer Confidence Report for the most current test results.
Does Ottawa have any water quality violations?
Yes, Ottawa currently has 143 active violations. See the violations section above for details.