Washougal Wastewater Treatment Plant

The purpose of this Waste Water Treatment Plant improvements project was to double the treatment capacity from 2.24 million gallons per day to 4.48 million gallons per day. The expansion includes a second influent pump station, a second oxidation ditch, flow distribution structure, second ultra violet disinfection system and a new structure to house the expanded ultra violet system, new electrical room to power the expanded components and a new effluent pump station. These improvements involved complex sequencing with several process shutdowns and bypass pumping.

  • Total Project Value: $12.7 million
  • Delivery Methods: Design Bid Build
  • Owner: City of Washougal

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