Matanuska-Susitna Borough

Septage and Waste Treatment Facility


For more information see the Wastwater & Septage Advisory Board Page. WSAB Board

Design and build a septage treatment facility in the Valley that serves Mat-Su residents. In June 2015, the Assembly designated the Central Landfill as the preferred location for this proposed facility. Septage is collected by private haulers from private residences, businesses and government institutions throughout the valley (i.e., schools, etc.).

Project Benefits

93% of Mat-Su residents rely on private septic systems. Septage hauling businesses empty those tanks at the nearest septage receiving station in Anchorage, traveling some 500,000 miles annually on the Glenn Highway. A new facility in the Valley will minimize disposal rates for residents, as well as impacts associated with the transport and disposal of the Mat-Su's septage in Anchorage.

Project History

Since the closure of the Borough's septage and leachate treatment facility in Houston in the early 1990's, all septage generated in the Borough has been hauled to Anchorage for disposal. In 2006, the Borough began investigating options for a new septage facility in the Valley. HDR completed the 2007 Septage Handling and Disposal Plan and updated it in 2013 following evaluation of constructing a regional wastewater treatment plant. As an outcome of the regional wastewater study, the Borough Assembly formed the MSB Wastewater and Septage Advisory Board (WSAB).

Following completion of a landfill leachate disposal plan in 2014, the Solid Waste Division requested to add leachate treatment to the the scope of the project. The WSAB recommended, and the Assembly approved, adding leachate treatment to the project scope in 2014. In November 2014, the Assembly approved an application for a $22 million loan to design and construct the new septage & leachate facility. Site selection feasibility studies on two MSB-owned sites were completed by Ch2MHill in April 2015. Due to the projected costs of septic and the environmental concerns with leachate, the Borough decided in 2018 to treat leachate separately and is proceeding with design of a small leachate treatment facility at the Landfill. A public open house was held on July 9, 2019, in the Borough Assembly chambers to provide information to interested members of the public. In 2022, CRW Engineering completed a feasibility study examining the use of the city of Palmer's wastewater treatment plant for septage disposal. This report is available and will be presented to the Assembly at the upcoming August 2nd work session.