Agua Nueva & Tres Rios Water Reclamation Facility Regional Optimization Master Plan Project

Pima County, AZ
Pima County
MWH Global Inc., Greeley and Hansen LLC, Parsons Corp., D.L. Whithers Construction, Kiewit Corp., HDR Eng. Inc., McDade & Woodcock Inc., SunWestern Contractors Inc., Sundt Construction
$637 million
82 mgd

To comply with new regulatory requirements set by the Arizona Department of Environmental Quality, the Pima County (Ariz.) Regional Wastewater Reclamation Department (RWRD) needed to reduce total nitrogen concentrations in the effluent it discharged into the Santa Cruz River. The department also hoped to optimize biosolids and biogas production.

The $673 million project—known as the Pima County Regional Optimization Master Plan (ROMP)—comprises four components: a 5-mile, 72-in. interconnect sewer pipeline; a water, energy and sustainability center that includes a National Environmental Laboratory Accreditation Conference training center; a new 32-million-gal-per-day (mgd) water reclamation campus; and an upgrade and expansion of the Tres Rios Water Reclamation Facility (WRF)—formerly known as the Ina Road WRF—to 50 mgd. 

The 32-mgd facility, known as the Agua Nueva WRF, will replace the county’s Roger Road WRF and will address the Santa Cruz River discharge issues. Solids from this facility will be transferred to the Tres Rios WRF via the new sanitary sewer interconnect. 

The project, which has an estimated completion date of Jan. 31, 2015, will replace 90% of Pima County’s existing wastewater reclamation capacity. 

“ROMP is a key effort in Pima County to upgrade wastewater infrastructure. It produces highest-quality effluent water to support sustainability and growth into the future,” said Jackson Jenkins, director of Pima County RWRD. “The high-quality water can be used on ballparks, golf courses and riparian habitats. We also are banking the water for future use and to lessen the demand on groundwater. 

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