West Yellowstone Waste District // West Yellowstone, MT

West Yellowstone Waste District // West Yellowstone, MT



    Client Needs:


    The District issued an RFP seeking a single vendor to provide a turn-key Municipal Solid Waste (MSW) composting facility that would: 

    • Process up to 40 tons/day of MSW waste per year in a region known for extreme winter conditions; 
    • Require few operational staff and a small and footprint; and, 
    • Provide in-vessel composting of mechanically sorted MSW. 



    ECS Solution:


    ECS teamed up with Montana based, DA Construction, to build an enclosed compost facility featuring an In-Vessel Tunnel composting system. 

    Pre-Processing: A wet mill homogenizes the floor sorted MSW, mechanically reducing paper and other feedstocks without shredding or grinding. The wet mill includes a coarse trommel screen section that removes 5"+ physical contaminants. Fines passing through the screen are conveyed to a heavy-duty mixer that blends them with biosolids and bulking agents. 

    In-Vessel Tunnel: Primary composting takes place in seven low-headspace vessels that feature a sophisticated aeration design and the ECS CompTroller™ (automated process control system). These concrete and stainless steel vessels hold up-to 175 yd3 each. The raw mix is moved from the mixer to the vessels with a specialized vessel loading conveyor system. This vessel loading system reduces labor, uses vessel space more efficiently, and minimizes worker exposure to feedstocks. 

    Product Curing and Refining: An Aerated Static Pile curing process follows primary composting in-vessel. After product curing, front-end loaders move the compost to the product refining area. An in-feed hopper evenly meters the product over a vibrating screen and then to an air-classification de-stoner, that removes physical contaminants in preparation for markets.


    The compost that the West Yellowstone Compost Facility produces is used for projects within the Yellowstone National Park and West Yellowstone/Hebgen Basin Solid Waste District.



    Capacity (tpy)




    ECS Technologies Employed

    In-Vessel Tunnel System

    CompTroller™ Automated Control & Monitoring System

    Low-Friction Aeration Floor

    Reversing Aeration System

    POG biofilter

    Horizontal Auger Compost Mixer

    Mobile Vessel Loading Conveyor

    Start-Up Year

    2003, 2016


    West Yellowstone, MT


    "Whenever I have a question or an issue with our system I call ECS. Typically, they listen to the problem, ring off to do some research, and then call me back and walk me through trouble-shooting to solution. ECS provides excellent customer support."


    - John Burns

    Facility Manager

    West Yellowstone Compost Facility

    West Yellowstone, MT


    Visit the West Yellowstone/Hebgen Compost Facility online.