Best Project, Water/Environment: Johnson County Tomahawk Creek Waster Treatment Facility Improvements

A growing population, aging infrastructure and more stringent effluent limits necessitated the large-scale expansion of the Tomahawk Creek Wastewater Treatment Facility. The $268-million project included construction of 30 new structures, more than 130 installed pumps, nine miles of underground utilities and 792 deep foundation drilled shafts.

It’s the largest infrastructure project ever undertaken by Johnson County, increasing the facility’s footprint by approximately 30%. The expansion nearly tripled the facility’s average treatment capacity to 19 million gallons a day during dry weather and up to 172 mgd during wet weather.