. The changing Illinois environment : critical trends : technical report of the Critical Trends Assessment Project. Man; Pollution; Environmental protection; Ecology; Environmental impact analysis. LANDFILLS The development of new landfills has been well documented since regulation of landfills began about 1970, but identifying the precise number of sites prior to regulation is challenging. No central agency maintained records throughout the state and the level of precision varies where records were maintained. A number of historical inventories have been conducted throughout Illinois using in
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. The changing Illinois environment : critical trends : technical report of the Critical Trends Assessment Project. Man; Pollution; Environmental protection; Ecology; Environmental impact analysis. LANDFILLS The development of new landfills has been well documented since regulation of landfills began about 1970, but identifying the precise number of sites prior to regulation is challenging. No central agency maintained records throughout the state and the level of precision varies where records were maintained. A number of historical inventories have been conducted throughout Illinois using information from a number of sources to fill in the information gaps between pre-regulation and regulatory years. The most comprehensive of these efforts was automated and updated by ISGS for HWRIC between 1984 and 1988. The most recent report discussing findings of the inventory was published in 1990. This Inventory of Landbased Disposal Sites includes information from lEPA's regulatory files, pubhc health and solid waste planning agencies and research conducted by historians in the Chicago metropolitan area. This inventory contains information about many types of land disposal sites both open and closed. The HWRIC inventory identified 3, 079 sites in Illinois that at one time were classified as "landfills" including sites closed prior to regulation. The lEPA maintains a Comprehensive Inventory of Special Waste Handlers which lists all types of facilities subject to regulation by the Division of Land Pollution Control. In 1990, this inventory listed 1, 937 sites as landfills. In addition, 1, 711 sites were classified as "Illegal Dumps", some of which are sites used for land disposal. The HWRIC and lEPA inventories are not direcdy comparable because of differences in definition and criteria for inclusion. It is reasonable to assume, however, that over 3, 000 sites have been identified as operating or closed landfills. During 1992, only 106 landfills in the state w