The Old Southington Landfill is an 11-acre site that was used as early as the 1920s until 1967 as a municipal disposal area. During this time, the landfill was open to residents and businesses of the Town. In 1967, the Town of Southington closed the landfill. Closure procedures included compacting loose refuse, covering the landfill with at least 2 feet of clean fill material, and reseeding with grasses. Between 1973 and 1980, the landfill was subdivided and sold for residential and commercial development. Several residential and commercial structures were built on the Site and on adjacent areas. The former landfill is located approximately 700 feet southeast of the former municipal Well No. 5, which was installed in 1971 by the Town of Southington Water Department as a public water supply. In 1979, the municipal well was closed because groundwater analyses indicated the presence of volatile organic compounds (VOCs) at levels that exceeded State standards. The well has permanently been closed. The site is located approximately 1,800 feet to the east of the Quinnipiac River.

The USFWS determined that erosion and remedial activities resulted in the permanent destruction of approximately 0.6 acre of palustrine emergent and forested wetland habitat. In addition, about 4.4 acres of Black Pond was contaminated with elevated levels of mercury, cadmium and other metals. The degradation and loss of these wetland and open water habitats adversely affected wetland-dependent wildlife, primarily migratory birds. In a 2009 settlement with the Responsible Party, the DOI received $537,000 to implement wetland habitat restoration, including all costs associated with damage assessment, planning, restoration, and monitoring.