Wastewater Treatment Plant Expansion Phase 1 & 2

Liberty Lake, WA


gallons of wastewater per day


construction cost


EPA Region 10 Exceptional Project


Over the past several years, the District has been taking steps to upgrade its water reclamation plant to reduce or eliminate pollutants entering the Spokane River. Century West provided design and construction period services for two major facility upgrades. In this latest phase, the District installed improvements to treat 1.5 million gallons per day (MGD) of wastewater with state-of-the-art membrane filtration. The project included construction and installation of a tertiary membrane filtration system resulting in the facility’s ability to meet reclaimed water standards. The membrane filtration system has been operational since September 2018, and samples from the plant have already shown improvements in the quality of effluent with a reduction in phosphorous, biochemical oxygen demand (BOD), and total suspended solids (TSS) loading. The project also included construction of a final treatment building, installation of final effluent filtration equipment, chemical feed systems, upgrades to the existing ultraviolet (UV) disinfection system, and remodeling of an existing fire station to serve as a laboratory/operations building. Work phases included:
  • Design of the filtration system and associated site improvements
  • Fabrication and delivery of membrane filtration system equipment and ancillary components, process instrumentation, and control panels
  • On-site start-up, testing, and training
  • Post-commissioning assistance

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