Dekalb, Illinois Water Quality Report
Water quality data for 4 water systems serving 51,530 people.
Water Source
Detected Contaminants
| Contaminant | Detected Level | EPA Limit (MCL) | Health Guideline | % of Limit | Status |
|---|---|---|---|---|---|
| lithium | 18.9 | No federal limit | 10.0 ug/L(EPA/USGS HBSL) | 189% | Above guideline |
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Compliance & Violations
Active Violations (1)
72
Jul 1, 2025
Resolved Violations (499)
27
Oct 1, 2023 — Dec 31, 2023
3A
Oct 1, 2023 — Oct 31, 2023
3A
Oct 1, 2023 — Oct 31, 2023
3A
Oct 1, 2023 — Oct 31, 2023
3A
Oct 1, 2023 — Oct 31, 2023
+ 494 more resolved violations
Frequently Asked Questions
Is Dekalb tap water safe to drink?
Dekalb'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 Dekalb tap water?
1 contaminants have been detected in Dekalb's water supply across 4 water systems. See the full contaminant table above for details.
How can I improve my water quality in Dekalb?
Install a water filter rated for the specific contaminants found in Dekalb's water. See our filter recommendations above. You can also request your utility's Consumer Confidence Report for the most current test results.
Does Dekalb have any water quality violations?
Yes, Dekalb currently has 56 active violations. See the violations section above for details.