Mchenry, Illinois Water Quality Report
Water quality data for 19 water systems serving 42,518 people.
Water Source
Detected Contaminants
| Contaminant | Detected Level | EPA Limit (MCL) | Health Guideline | % of Limit | Status |
|---|---|---|---|---|---|
| lithium | 11.0 | No federal limit | 10.0 ug/L(EPA/USGS HBSL) | 110% | Above guideline |
| PFBA | 0.009 | No federal limit | 1000.0 ug/L(EWG) | 0% | Below guideline |
| PFBS | 0.009 | No federal limit | 2000.0 ug/L(EPA Health Advisory) | 0% | Below guideline |
| PFHpA | 0.004 | No federal limit | 1000.0 ug/L(EWG) | 0% | Below guideline |
| PFHxA | 0.013 | No federal limit | 1000.0 ug/L(EWG) | 0% | Below guideline |
| PFHxS | 0.006 | 0.010 ug/L | 0.001 ug/L(EWG) | 57% | Within limit |
| PFOA | 0.008 | 0.004 ug/L | 0.090 ug/L(EWG) | 208% | Above limit |
| PFPeA | 0.014 | No federal limit | 1000.0 ug/L(EWG) | 0% | Below guideline |
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 (5)
52
Jul 1, 2025
52
Jul 1, 2025
2E
Oct 17, 2024
2E
Oct 17, 2024
2E
Oct 17, 2024
Resolved Violations (495)
75
Jan 16, 2025
75
Jan 16, 2025
75
Jan 16, 2025
75
Jan 16, 2025
75
Jan 16, 2025
+ 490 more resolved violations
Frequently Asked Questions
Is Mchenry tap water safe to drink?
Mchenry's water has 1 contaminant detected above EPA limits. While the water is treated, residents may want to consider additional filtration.
What contaminants are in Mchenry tap water?
8 contaminants have been detected in Mchenry's water supply across 19 water systems. See the full contaminant table above for details.
How can I improve my water quality in Mchenry?
Install a water filter rated for the specific contaminants found in Mchenry's water. See our filter recommendations above. You can also request your utility's Consumer Confidence Report for the most current test results.
Does Mchenry have any water quality violations?
Yes, Mchenry currently has 210 active violations. See the violations section above for details.