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  • Location: Iowa City, IA
  • Contract Value: $43,714,093
  • Owner: City of Iowa City
  • Engineer: Stanley Consultants
  • Delivery Method: Design-Bid-Build
  • Award: APWA Environmental Project of the Year


The City’s north plant was eliminated, and all wastewater treatment operations were transferred to the south plant. The consolidation work increased the intake at the south facility by 33%. Work included the expansion of equalization basins; replacement of long shaft pumps with close coupled pumps; addition of vortex grit tanks; addition of primary and secondary clarifiers; refurbishment of existing clarifier mechanisms; expansion of existing biological treatment tanks; addition of aeration blowers; replacement of existing chlorination system with a UV disinfection system; addition of a sodium hypochlorite system; addition of a rotary drum thickening unit; modifications to existing digesters; replacement of existing cake storage facility with partially covered facility; replacement of effluent water pumping system; replacement of irrigation water filtration system, site piping and flow splitting structures; miscellaneous HVAC, plumbing and electrical upgrades; instrumentation and control upgrades; and the addition of a storage warehouse.