master disposal service landfill

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The Master Disposal Service Landfill (MDSL) Superfund site is located at 19980 West Capitol Drive in the town of Brookfield, Waukesha County, Wisconsin. The site occupies a 40-acre parcel of land, of which 26 acres comprise the now inoperative landfill. The site is on a raised plateau in the middle of the marshy floodplain of the headwaters of the Fox River, which flows southwest into Illinois. It is estimated that 1.4 million cubic yards of waste, including industrial wastes such as solvents, paints, adhesives, oils, and foundry waste, were disposed of at the site when the MDSL operated between 1967 and 1982. The site was partially closed in 1982, but the cover materials used at the time were derived from an on-site source with an inadequate clay content. Erosion of the cap and subsequent re-exposure of waste materials then become a problem. The western suburbs of Milwaukee have experienced steady to rapid growth over the past 20 years. The formerly rural site setting is now characterized by area light industrial, commercial, and residential development. Land immediately surrounding the landfill, however, is a wetland and is zoned as an environmental corridor. EPA placed the MDSL site on the National Priorities List (NPL) in September 1984. Site Responsibility The MDSL site is being addressed through potentially responsible party (PRP) actions under state and federal oversight.

Hazardous Ranking Score

47 / 100

A score of 28.5 or higher qualifies a site for the Superfund National Priority List.

Regional Contact

Region 5
Phone: (312) 353-2000

Contact Region



Site Inspection
Preliminary Assessment
Final Listing On NPL

Contaminants & Health Effects

      Endocrine Disrupter
      Reproductive Toxin
      Persistent, bioaccumulative and toxic


        African American
        American Indian and Alaska Native
        Native Hawaiian


        People living
        within a 1 mile radius


        Average Income


        Occupied homes

        Potentially Responsible Parties

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