The Illinois Environmental Protection Agency says the state's municipal landfills have a combined life expectancy of 21 years.
The agency released its annual report on landfill capacity on Wednesday, based on 2013 statistics.
It says 42 landfills reported receiving more than 45 million cubic yards of waste and had more than 947 million cubic yards of capacity remaining.
The EPA says capacity can fluctuate from year to year, because some landfill cells are filled and others are opened.
The report says two facilities have become inactive, one reported zero remaining capacity and one new facility opened.
Statistics do not include transfer stations and compost facilities because they don't permanently store waste.