EPA completed its sixth review of the site's cleanup in July 2023. This type of review is required at least every five years where the cleanup is complete, but hazardous waste remains managed on-site. These reviews are done to ensure that the cleanup continues to protect people and the environment. The review included evaluations of:
| City | Onalaska |
|---|---|
| County | La Crosse County |
| State | Wisconsin |
| Coordinates | 43.95730, -91.33820 |
Onalaska Municipal Landfill is a federal Superfund site in Wisconsin. The Superfund program, created by Congress in 1980, addresses sites where hazardous substances have been released or threaten release into the environment. EPA scores potential sites using the Hazard Ranking System; those that score high enough are placed on the National Priorities List.
Current status: Construction complete. Physical construction of the cleanup remedy is complete, though long-term monitoring and institutional controls typically continue for years or decades. Groundwater treatment systems, for example, often run long after surface cleanup finishes.
EPA has identified 10 contaminants of concern at this site, including 1,1,1-trichloroethane, 1,1-dichloroethane, 1,1-dichloroethene. Contamination has been detected in soil, groundwater.
If you live near this site and have health concerns, your state health department can provide site-specific guidance. EPA maintains a community involvement program for most NPL sites, and site documents — including the Record of Decision, five-year reviews, and public health assessments — are typically available through EPA's Superfund site profile.