The Asbestos Dump Superfund Site consists of the 11-acre Millington site and three separate satellite sites: 1) the 12-acre White Bridge Road site, 2) the 30-acre New Vernon Road site, and 3) the 7-acre Dietzman Tract site in the Great Swamp National Wildlife Refuge (GSNWR). The US Environmental Protection Agency (EPA) placed the Millington property and the three satellite sites on the Superfund program's National Priorities List (NPL) in 1983.

The Millington site (Operable Unit 1) lies in a residential and commercial area. Beginning in 1927, a succession of owners operated an asbestos products manufacturing plant on the site. The plant was purchased by the National Gypsum Company (NGC) in 1954, where it manufactured asbestos cement until 1975. Dumping, burning, and waste disposal took place on the property, comprising a large mound approximately 1.5 acres in size, until on-site disposal reached capacity and the owners began sending waste and materials containing asbestos to the three nearby satellite disposal areas. Prior to remediation, erosion and weathering of the mound exposed areas of asbestos along the bank of the Passaic River.

The White Bridge Road and New Vernon Road satellite sites (Operable Unit 2) are residential properties. The White Bridge Road site is bounded by the GSNWR and private residences. This property was a farm until 1969, when the current owner started landfilling asbestos waste from the Millington facility. The wastes were present on the site as subsurface fill or as part of an asbestos waste mound. Disposal continued until the facility closed in 1975. At the New Vernon Road site, broken asbestos tiles and siding, as well as loose asbestos fibers, were landfilled on this former corn and dairy farm during the late 1960's. In 2002, the owner of the New Vernon Road site transferred 25-acres of the property to the US Fish and Wildlife Service (FWS) to expand the GSNWR.

The Dietzman Tract or the Great Swamp area (Operable Unit 3), is located within the GSNWR, about 2 miles southeast of New Vernon Road. Nicholas Dietzman owned the 104.4-acre parcel from 1918 until 1968 when it was purchased by FWS and became Tract 230 of the GSNWR. Throughout ownership of the property, Mr. Dietzman disposed of refuse collected from neighboring communities in open pits or on the land surface. For at least six years prior to the purchase of the property in 1968, refuse and slag from the NGC plant in Millington, New Jersey were also landfilled on the site. FWS first learned of the potential hazards of asbestos on the former Dietzman property as a result of notification from the New Jersey Department of Environment Protection (NJDEP) in June 1978. This site is bordered by Great Brook and woodland habitat.

Cleanup of the sites has been completed. EPA removed the White Bridge Road site from the NPL in 2002. The other sites were removed from the NPL in 2010.