Collinsville, Illinois Water Quality Report
Water quality data for 2 water systems serving 31,000 people.
Water Source
Detected Contaminants
| Contaminant | Detected Level | EPA Limit (MCL) | Health Guideline | % of Limit | Status |
|---|---|---|---|---|---|
| PFBA | 0.013 | No federal limit | 1000.0 ug/L(EWG) | 0% | Below guideline |
| PFBS | 0.016 | No federal limit | 2000.0 ug/L(EPA Health Advisory) | 0% | Below guideline |
| PFHpA | 0.013 | No federal limit | 1000.0 ug/L(EWG) | 0% | Below guideline |
| PFHxA | 0.022 | No federal limit | 1000.0 ug/L(EWG) | 0% | Below guideline |
| PFHxS | 0.012 | 0.010 ug/L | 0.001 ug/L(EWG) | 120% | Above limit |
| PFOA | 0.018 | 0.004 ug/L | 0.090 ug/L(EWG) | 450% | Above limit |
| PFOS | 0.009 | 0.004 ug/L | 0.300 ug/L(EWG) | 223% | Above limit |
| PFPeA | 0.021 | 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 (37)
75
Aug 22, 2025
4H
Jul 2, 2025
4H
Jul 2, 2025
72
Jul 1, 2025
52
Jul 1, 2025
52
Jul 1, 2025
4G
Oct 17, 2024
2E
Oct 17, 2024
2E
Oct 17, 2024
4G
Oct 17, 2024
52
Oct 1, 2024
52
Oct 1, 2024
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Resolved Violations (85)
71
Jul 1, 2025
71
Jul 1, 2025
71
Jul 1, 2023
71
Jul 1, 2023
3A
Jun 1, 2023 — Jun 30, 2023
+ 80 more resolved violations
Frequently Asked Questions
Is Collinsville tap water safe to drink?
Collinsville's water has 3 contaminants detected above EPA limits. While the water is treated, residents may want to consider additional filtration.
What contaminants are in Collinsville tap water?
8 contaminants have been detected in Collinsville's water supply across 2 water systems. See the full contaminant table above for details.
How can I improve my water quality in Collinsville?
Install a water filter rated for the specific contaminants found in Collinsville's water. See our filter recommendations above. You can also request your utility's Consumer Confidence Report for the most current test results.
Does Collinsville have any water quality violations?
Yes, Collinsville currently has 37 active violations. See the violations section above for details.