Tacoma Central Treatment Plant Upgrades

Location: Tacoma, Washington, United States

Region: Americas

Service Offering: Engineering & Design, Construction & Construction Management

Market Sector: Water & Wastewater

Status: Complete

The improvements to the wastewater treatment plant were EPA consent decree driven and included construction of a new headworks, a new 150-mgd influent pump station, a new grit facility, rehabilitation of the existing grit facility and conversion into an odor control facility, a new peak wet weather facility and new effluent pump station. The improvements touched nearly every part of the plant including upgrades to the City’s existing influent and effluent pump stations, upgrades to the existing disinfection system and extensive upgrades to the solids handling system. The project also included an addition to the City’s maintenance building on the property.

Throughout the project, MWH has worked openly with plant operations staff and our team of subcontractors to overcome the challenges of working within an existing, compact and continuously operating treatment plant environment. MWH approached these issues in stride with a flexible approach that included rerouting designs, and rescheduling activities to maintain plant operations and the construction work.