Spokane River Side Park Water Reclamation Facility

Slayden and MWH Constructors worked with the City of Spokane to achieve significant upgrades to their Riverside Park Water Reclamation Facility. The upgrade included a Next Level of Treatment (NLT), a new membrane filtration system that significantly improved the quality of effluent released into the Spokane River. The primary reason for the NLT was to decrease phosphorus levels from the effluent to 99%, part of a major initiative to improve the health of the Spokane River. The new filtration system also removed more significant amounts of heavy metals, PCBs, and other pollutants associated with the facility.

The advanced membrane filtration technology provides pollution reduction benefits and is designed to treat an average wastewater flow of 50 MGD.  The newly upgraded plant now treats the wastewater to a “Class A” standard, allowing the water to be reused for irrigation, dust control, industrial processes, enhancing wetlands, and recharging groundwater supplies.

Winner - Award of Merit in the Water and Environment category from Engineering News-Record Northwest 2022 Best Projects

  • Completed
  • Total Project Value: $176 million
  • Delivery Methods: GC/CM
  • Owner: City of Spokane