Markham, Illinois Water Quality Report
Water quality data for 2 water systems serving 12,525 people.
Water Source
Detected Contaminants
| Contaminant | Detected Level | EPA Limit (MCL) | Health Guideline | % of Limit | Status |
|---|---|---|---|---|---|
| PFHxA | 0.003 | No federal limit | 1000.0 ug/L(EWG) | 0% | Below guideline |
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Compliance & Violations
Active Violations (37)
4H
Jul 2, 2025
4H
Jul 2, 2025
72
Jul 1, 2025
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Resolved Violations (111)
27
Jul 1, 2025 — Sep 30, 2025
71
Jul 1, 2023
71
Jul 1, 2023
75
Jun 15, 2023
75
Jun 15, 2023
+ 106 more resolved violations
Frequently Asked Questions
Is Markham tap water safe to drink?
Markham'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 Markham tap water?
1 contaminants have been detected in Markham's water supply across 2 water systems. See the full contaminant table above for details.
How can I improve my water quality in Markham?
Install a water filter rated for the specific contaminants found in Markham's water. See our filter recommendations above. You can also request your utility's Consumer Confidence Report for the most current test results.
Does Markham have any water quality violations?
Yes, Markham currently has 37 active violations. See the violations section above for details.