MyCleanWater

Ottawa, Illinois Water Quality Report

Water quality data for 9 water systems serving 19,349 people.

45
Poor
out of 100

Water Source

9
Water Systems
19K
People Served
Ground water
Water Source

Detected Contaminants

ContaminantDetected LevelEPA Limit (MCL)Health Guideline% of LimitStatus
lithium13.1 No federal limit10.0 ug/L(EPA/USGS HBSL)
131%
Above guideline

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Compliance & Violations

Active Violations (36)

75

Sep 26, 2025

minor

75

Aug 30, 2025

minor

75

Aug 30, 2025

minor

75

Aug 22, 2025

minor

75

Aug 20, 2025

minor

75

Jul 31, 2025

minor

4H

Jul 2, 2025

minor

4H

Jul 2, 2025

minor

4H

Jul 2, 2025

minor

4H

Jul 2, 2025

minor

71

Jul 1, 2025

minor

75

Jun 7, 2025

minor

75

Jun 7, 2025

minor

75

Apr 19, 2025

minor

57

Apr 2, 2025

critical

75

Mar 26, 2025

minor

75

Feb 21, 2025

minor

75

Feb 21, 2025

minor

75

Jan 26, 2025

minor

75

Dec 18, 2024

minor

75

Dec 7, 2024

minor

75

Dec 7, 2024

minor

75

Nov 6, 2024

minor

75

Nov 6, 2024

minor

4G

Oct 17, 2024

minor

4G

Oct 17, 2024

minor

2E

Oct 17, 2024

critical

2E

Oct 17, 2024

critical

75

Oct 11, 2024

minor

71

Jul 1, 2024

minor

71

Jul 1, 2024

minor

75

Apr 11, 2024

minor

75

Apr 11, 2024

minor

52

Oct 1, 2023

moderate

52

Oct 1, 2023

moderate

75

May 19, 2023

minor

Resolved Violations (464)

3A

Sep 1, 2025 — Sep 30, 2025

minor

27

Sep 1, 2025 — Sep 30, 2025

moderate

27

Aug 1, 2025 — Aug 31, 2025

moderate

3A

Aug 1, 2025 — Aug 31, 2025

minor

75

Jul 27, 2025

minor

+ 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.