La Crosse, Wisconsin Water Quality Report
Water quality data for 10 water systems serving 55,616 people.
Water Source
Detected Contaminants
| Contaminant | Detected Level | EPA Limit (MCL) | Health Guideline | % of Limit | Status |
|---|---|---|---|---|---|
| PFBA | 0.021 | No federal limit | 1000.0 ug/L(EWG) | 0% | Below guideline |
| PFBS | 0.015 | No federal limit | 2000.0 ug/L(EPA Health Advisory) | 0% | Below guideline |
| PFHxA | 0.004 | No federal limit | 1000.0 ug/L(EWG) | 0% | Below guideline |
| PFHxS | 0.008 | 0.010 ug/L | 0.001 ug/L(EWG) | 84% | Near limit |
| PFOA | 0.005 | 0.004 ug/L | 0.090 ug/L(EWG) | 128% | Above limit |
| PFOS | 0.005 | 0.004 ug/L | 0.300 ug/L(EWG) | 138% | Above limit |
| PFPeA | 0.004 | 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 (22)
4H
Jul 2, 2025
66
Jan 1, 2025
2E
Oct 17, 2024
75
Oct 17, 2024
75
Oct 17, 2024
66
Jan 1, 2022
75
Apr 1, 2012
75
Apr 1, 2012
75
Oct 1, 2011
75
Oct 1, 2011
Violation
Unknown
Violation
Unknown
Violation
Unknown
Violation
Unknown
Violation
Unknown
Violation
Unknown
Violation
Unknown
Violation
Unknown
Violation
Unknown
Violation
Unknown
Violation
Unknown
Violation
Unknown
Resolved Violations (468)
72
Jul 1, 2025
72
Jul 1, 2025
71
Jul 1, 2025
71
Jul 1, 2025
3A
Jun 1, 2025 — Jun 30, 2025
+ 463 more resolved violations
Frequently Asked Questions
Is La Crosse tap water safe to drink?
La Crosse's water has 2 contaminants detected above EPA limits. While the water is treated, residents may want to consider additional filtration.
What contaminants are in La Crosse tap water?
7 contaminants have been detected in La Crosse's water supply across 10 water systems. See the full contaminant table above for details.
How can I improve my water quality in La Crosse?
Install a water filter rated for the specific contaminants found in La Crosse's water. See our filter recommendations above. You can also request your utility's Consumer Confidence Report for the most current test results.
Does La Crosse have any water quality violations?
Yes, La Crosse currently has 22 active violations. See the violations section above for details.