Jump to main content.

Oconomowoc Electroplating Co. Inc.

Site Information
Contact Information

Community Involvement Coordinator
Susan Pastor (pastor.susan@epa.gov)
312-353-1325 or 800-621-8431, ext. 31325

Remedial Project Manager
Bill Ryan (ryan.williamj@epa.gov)
312-353-4374 or 800-621-8431, ext. 34374


(where to view written records)

Ashippun Town Hall
W1266 Highway O
Oconomowoc, WI


The Oconomowoc Electroplating Co., Inc. site is located in the unincorporated town of Ashippun, a rural area about 35 miles west of Milwaukee. It operated from 1957 to the early 1980s as an industrial facility that used metals, chemicals and organic compounds in its production process. During that time, the company discharged untreated wastewater into nearby wetlands and Davy Creek. Two unlined lagoons on the property contained electroplating sludge. These lagoons leaked and sometimes overflowed. Contaminants made their way into the ground water beneath and downstream of the site. (more...)

Site Updates || Fact Sheets || Technical Documents || Five-Year Reviews

You will need the free Adobe Reader to view some of the files on this page. See EPA's PDF page to learn more.

Site Updates

November 2013

Ashippun residents may have noticed extra people and activity around the treatment plant over the summer as EPA completed its soil mixing project to clean up remaining contamination that the pump and treat system failed to remove.  The work entailed excavating five small areas around the treatment plant building and mixing in a non-toxic form of iron that will speed up the breakdown of volatile organic compounds that are still contaminating the ground water.

When the work was completed, the site was restored to pre-project conditions. The fencing and erosion control measures are gone, the excavated areas reseeded, and the trees that were removed to allow access have been replaced. The treatment plant remains shut down after eight years of operation. In 2004, EPA determined the plant was no longer effective in removing contamination trapped by very fine sediment in the “source areas.” The soil mixing project was designed to address these areas.

EPA completed a status review of the cleanup in 2012. This type of review is required at least every five years where hazardous waste remains managed on-site.  It is done to ensure that the cleanup continues to protect people and the environment. The review evaluated:

The review found that the cleanup continues to protect people and the environment. This was the fourth five-year review for Oconomowoc Electroplating. The next scheduled review will be in 2017.

EPA issued an amendment to the Record of Decision in 2011, officially changing the cleanup from ground water extraction and treatment to monitored natural attenuation. Responsibility for general site maintenance and ground water monitoring has been transferred to the Wisconsin Department of Natural Resources. EPA will remain responsible for overseeing the implementation of MNA and coordinating the removal, sale, or transfer of on-site government-owned/government-furnished property.


Fact Sheets

Top of page

Technical Documents

Top of page

Five-Year Reviews

Top of page

Local Navigation

Jump to main content.