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This regional facility provides state-of-the art infrastructure to safely manage materials that cannot be reused or recycled. The landfill opened in 2024 and is located in Eastern Washington, nine miles from Washtucna and 80 miles from Spokane. The Subtitle D facility is permitted to accept primarily household garbage in addition to industrial and special wastes. It is also permitted to accept industrial liquids into surface impoundments. It does not accept hazardous waste. Adams County Regional Landfill is engineered with overlapping environmental protection systems that meet or exceed rigorous state and federal regulations and are subject to highly regulated monitoring and reporting requirements. The site uses sophisticated monitoring protocols to verify that its environmental protection systems are operating properly. The WM Environmental Protection team and independent professionals regularly gather monitoring data and submit it to regulatory agencies.
Containment Design
This facility has a multi-layer composite liner system that includes an engineered geosynthetic clay barrier and a 60-mil, high-density polyethylene geomembrane to ensure waste and wastewater (leachate) are contained and isolated from soil and groundwater.
Groundwater Monitoring
Groundwater is monitored using onsite wells, both upgradient and downgradient of the waste disposal footprint. Testing and monitoring provide added assurance of groundwater protection surrounding the landfill.
Leachate Collection and Treatment
The leachate collection and treatment system consists of a highly permeable gravel drainage layer covering the entire landfill base, graded to drain to a collection sump. Perforated pipes at low points collect and route leachate to a double composite-lined evaporation pond.
Waste Approval Process
WM has a defined waste screening protocol for each of its Subtitle D nonhazardous waste facilities. The protocol is designed to protect our employees, the community and the environment. For industrial and special waste streams, the generator or agent must complete a Generator's Non-Hazardous Waste Profile (available online at wmsolutions.com) for review by our technical staff.
Adams County Regional Landfill
2660 East Syd Sullivan Lane Washtucna, WA 99371
Hours of Operation Monday - Friday 7 am - 4 pm Facility not open to the public.
Year Opened 2024
Projected Life Remaining 80-150 years
Facility Acreage 3,300 acres
Permitted Footprint 550 acres
Ownership Waste Management of Washington, Inc.
Permit Type and Permit # Solid Waste Handling Permit 0597-01 Ecology Air Permit A001086
Regulatory Agencies Adams County Washington Department of Ecology
Employees 10
States Served Washington, Idaho and Montana
Landfill Customer Service Technical Service Center 800-963-4776 TSCwestern@wm.com
Media Relations Patrick McCarthy 425-393-9923 pmccart2@wm.com
