Nampa WWTP Phase 1 Upgrades Project Group A
Nampa, Idaho
Award of Merit

Owner: City of Nampa
Lead Design Firm: Jacobs
General Contractor: The Ewing Co.
Program Manager: Brown and Caldwell

Originally constructed in the 1960s, with a major addition built in 1980, Nampa’s wastewater treatment plant required upgrades to meet increasingly stringent regulations for phosphorus and temperature as well as to accommodate growth in the community. The project replaced the heart of the liquid stream treatment process. It also included construction of a primary effluent pump station, modifications to two existing aeration basins, construction of a third aeration basin and demolition of several facilities. 

The plant had to stay fully operational 24/7 throughout construction. The team decided to eliminate long-term bypass pumping, thus saving time and ultimately resulting in visible improvements to water quality. The improvements also reduced 70 tons of phosphorus annually and will remove nearly 140 tons of phosphorus annually by 2040.

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