Jump to main content.

Penta Wood Products

Site Information
  • Daniels, WI (Burnett County)
  • EPA ID#WID980610646
  • Alias(es):Penta Wood Products Incorporated
Contact Information

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

Remedial Project Manager
Linda Martin
312-886-3854 or 800-621-8431, ext. 63854


(where to view written records)

Larsen Family Public Library,
7401 W. Main St., Webster, WI

Grantsburg Public Library
415 S. Robert St.
Grantsburg, WI


The 82-acre Penta Wood Products site is located in a predominantly agricultural area about two miles west of Siren. It operated from 1953 to 1992 using a chemical called pentachlorophenol, or PCP to treat wood posts and telephone poles. Back then, the site consisted of a main treatment building, an oil/water separator building, a gully where wastewater was discharged, a waste-water lagoon, a wood chip pile, and several other buildings, sawmills, garages and storage sheds. During its operation, wastewater containing oil and PCP was discharged into the lagoon and onto the wood chip pile. Two years after Penta Wood was closed, PCP and arsenic were found on-site in soil and ground water.

The cleanup was done in two phases. From 1994 to 1996, EPA removed about 28 storage tanks containing liquid and sludge. Also, 43,000 gallons of a PCP/oil mixture and sludge were disposed of off-site. The treatment building was demolished and contaminated soil was cleaned on-site or disposed of off-site.

By 2000, EPA had further studied the site and completed the cleanup. This included demolishing all the remaining buildings and equipment, excavating and moving contaminated soil and woodchips to an on-site disposal area, stabilizing arsenic-contaminated soil by mixing it with concrete and covering it, constructing a water-treatment system, building and infiltration and concrete basin, clearing trees and brush, installing pipes for the treatment system and ground-water extraction wells, and erecting a fence around the soil cover area.

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

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

Latest Update: February 2015

EPA completed a review of the Penta Wood Products site cleanup. 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:

The review found that the cleanup continues to protect people and the environment. The next scheduled review will be in 2019. The third five-year review (PDF) (130pp, 7MB) details the site's progress.

Top of page

Fact Sheets

Top of page

Technical Documents

Top of page

Five Year Reviews

Top of page

Legal Documents

Top of page

Local Navigation

Jump to main content.