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Washington, Iowa Wastewater Treatment Plant


The City of Washington Iowa was in need of expanded capacity for their community’s waste water treatment.  An aging treatment plant was becoming less efficient, and was not able to keep up with the high levels of inflow and infiltration of water during heavy rain events. FOX Engineering and Shive-Hattery teamed to design a new wastewater treatment facility that was completed in 2013.


The direction selected was to build a new SBR wastewater treatment plant on a site adjacent to the existing waste water treatment plant, and then to phase treatment from the old plant to the new plant. FOX Engineering provided process engineering services, and Shive-Hattery provided structural, mechanical, architectural, electrical and civil engineering design, bidding and construction services for a new SBR wastewater treatment facility.  The new facility included an operations building, laboratory building with staff offices, an SBR tank, a solids handling building, UV disinfection process, an equalization basin, a sludge storage tank, and several infrastructure improvements to tie the system together. Phasing the improvements was necessary to move processing from the existing facility to the new facility.


The new facility provides the City of Washington with the needed capacity and modern processes to serve the city’s needs for the future growth. The facility was operational in the fall of 2012 and construction costs were approximately $15 million.
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