View of Milner Butte Landfill from atop a nearby windmill.
The Southern Idaho Regional Solid Waste District (SISW) is a special purpose unit of local government whose mission is managing solid wastes for the seven south central Idaho counties of Blaine, Cassia, Gooding, Jerome, Lincoln, Minidoka, and Twin Falls.
In August of 1988, the Environmental Protection Agency (EPA) published new regulations for solid waste disposal known as 'Subtitle D'. (Please explore the "What Is A Modern Landfill?" page under 'About' to learn more about Subtitle D). These regulations called for expensive landfill improvements, and motivated local government to examine options for solid waste disposal. In 1989, a Solid Waste Planning Group formed in Southern Idaho and met monthly to explore options to meet the proposed EPA regulations.
In 1991, Idaho legislature passed a law authorizing the formation of regional waste districts. In 1992, the Southern Idaho Regional Solid Waste District formed.
Sites for the regional landfill were explored with input from the public. Construction at Milner Butte Landfill began in 1993 and opened for operation on April 6, 1994, four days ahead of federal mandate. Prior to this, counties each had their own disposal sites. In June of that year, work began to close and cap the seventeen old county-owned landfills. The work was completed the following year.
Our system features a state-of-the-art landfill that meets and exceeds regulations; fourteen waste transfer stations; a waste transport system; rural recycling opportunities; an effective waste diversion system; a public information and education network; and a safe and environmentally sound waste management system for problem wastes (such as petroleum contaminated soils and a variety of liquid wastes).
SISW's seven owner counties disposed of a total of 171,840 tons of waste at the Milner Butte Landfill over the last year. The cost to each county includes the county's share of landfill system costs, the cost of transferring waste from each county to Milner Butte Landfill, and each county's share of the cost of resource recovery and diversion programs.