WALNUT CSWLF Landfill - Tucson, Arizona Solid Waste Management Facility

WALNUT CSWLF is an operational landfill located in Tucson, Pima County, Arizona, United States. As a solid waste management facility, it plays a key role in the region's waste disposal infrastructure. The facility is situated at the north end of Alverson and Rill, serving the Tucson metropolitan area. The facility operates under the regulatory framework of the US EPA RCRA Subtitle D, which governs municipal solid waste landfills. This includes requirements for liner systems, leachate collection, groundwater monitoring, and landfill gas management. The NAICS code 562212 indicates it is classified as a solid waste landfill. In Arizona, landfills must also comply with state-specific regulations from the Arizona Department of Environmental Quality. Environmental considerations for this landfill include methane gas generation from decomposing waste, which is typically managed through gas collection systems to reduce greenhouse gas emissions. Leachate management is critical to prevent groundwater contamination, especially given the arid climate of Arizona. The facility's proximity to Tucson means it serves a significant urban population, with associated traffic and community impact considerations.

The landfill is located in the Sonoran Desert region, characterized by low rainfall and high evaporation rates, which can reduce leachate generation but also concentrate contaminants. Groundwater resources in the area are vital for both urban and agricultural use, making leachate management and groundwater monitoring essential. Methane emissions from the landfill contribute to local greenhouse gas emissions, and gas collection systems are typically employed to mitigate this. The facility's location near Tucson also raises considerations for odor control and traffic management to minimize community impact.