Onalaska
Is Onalaska tap water safe to drink?
Mostly yes — Onalaska scores 86/100. This report aggregates EPA drinking water data across 2 local systems in Onalaska. We found 96 total violations (40 unresolved).
Real-Time Environment
Live: 10:15 PM☀️ No active precipitation. Rainfall can impact surface water turbidity and pollutant runoff in Onalaska.
Water Quality Impact
🛡️ Home Water Treatment Needs
Should you invest in filtration or softening for your home in Onalaska?
Expert Advice
Your water quality is excellent. Standard filtration is optional but can further enhance taste.
Buying a Filter?
Filter requirements and certified reduction benchmarks for Onalaska tap water.
Baby Formula Safety
Infant formula preparation risks, nitrate levels, and lead pipe guidance in Onalaska.
Homebuyer's Perspective
Evaluating water infrastructure in Onalaska protects plumbing and helps estimate water heater longevity. The high safety score (86/100) suggests lower risk for plumbing corrosion and appliance scaling.
Health & Family Safety
Residents should monitor Lead (90th percentile) levels. Pregnant women and families with young children should consult the specific EPA health goals listed below.
View Health Risk Glossary →Compliance Record for Onalaska
Based on EPA SDWIS violation records and contaminant test results for all water systems serving Onalaska.
Frequently Asked Questions
Is Onalaska tap water safe to drink?
Mostly yes — Onalaska scores 86/100.
How many water systems serve Onalaska?
Onalaska is served by 2 public water systems in our latest EPA-backed dataset.
How can I check water quality for my exact address in Onalaska?
Use the WaterQ search tool to look up your ZIP code and view nearby systems, contaminant levels, and recent violations for Onalaska.
What is the water quality score for Onalaska?
The water quality score for Onalaska is 86 out of 100, based on EPA contaminant data, violation history, and testing results across the 2 systems serving the city.
What are the top contaminants in Onalaska?
The top contaminants detected in Onalaska include Lead (90th percentile). View detailed information on our contaminants page.
Onalaska Water Quality Summary
Onalaska, WI receives a water quality score of 86/100 (Grade B) based on EPA Safe Drinking Water Information System (SDWIS) compliance data for 2 public water systems serving the area.
Onalaska's water quality is above the national average, with strong compliance records and low contaminant levels. Residents generally receive clean, safe tap water that meets EPA standards.
Onalaska's score of 86 is 1 point above the Wisconsin state average of 85, and above the nationwide average of roughly 78/100 across all U.S. states.
Water quality data is sourced from the U.S. EPA SDWIS database and updated quarterly. Learn about our scoring methodology → Read our Wisconsin water quality rankings report →
Key Contaminants
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Water Systems Serving Onalaska (2)
Check Your Specific Address
Water quality can vary by neighborhood in Onalaska.
Related
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Compare Onalaska water quality: View all states · Contaminant library · How we score water quality