Population Served
18.0K
Service Connections
5.1K
Total Violations
25
Health-Based Violations
8
Lead & Copper Data
Lead Level
Safe0.00 ppb
Action Level: 15 ppb (EPA) · Sampled: 2023-09-30
015 ppb action level
Copper Level
1530 ppb
Action Level: 1,300 ppb (EPA) · Sampled: 2013-09-30
Copper action level exceeded
System Details
- Water Source
- Groundwater
- System Type
- Community Water System
- City
- Onalaska
- ZIP Code
- 54650
- Counties Served
- La Crosse
- Cities Served
- ONALASKA
- Open Violations
- 0
- State
- Wisconsin
Violation Summary
25
Total Violations
8
Health-Based
0
Open Now
Most recent violation: 2010-07-01
Explore Wisconsin Water Quality
See all water systems, lead data, and violation trends for Wisconsin.
Data source: EPA ECHO SDWIS Bulk Download (Jan 2026). PWSID: WI6320327.SafeWater Home