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Water Reclamation Plants

The City of Flagstaff operates two water reclamation plants (WRPs): Wildcat Hill and Rio de Flag.

Effluent from both plants is used for irrigation, dust suppression, and other approved uses in Flagstaff, as approved by the Arizona Department of Environmental Quality. Unused effluent is discharged into the Rio de Flag.

Did you know that the Rio de Flag and Wildcat Hill WRPs both use solar energy to help reduce their energy costs? You can learn more by reading Energy Savings from using Solar at City Sites or by contacting Nicole Woodman, Sustainability Manager.

Wildcat Hill WRP

The Wildcat Hill plant is an advanced wastewater treatment facility capable of treating 6 million gallons per day via screening, primary sedimentation, biofiltration, secondary sedimentation, disinfection, and filtration. The facility treats the sludge generated from the Rio de Flag WRP in addition to its own. Methane gas, which is generated from the treatment process, is used to power equipment and reduce electrical power consumption. The plant is capable of generating enough standby power to operate indefinitely in case of a power failure.

The Wildcat Hill WRP is located at 2800 N. El Paso Road, Flagstaff, Arizona, 86004.


Wildcat Hill Wastewater Treatment

Rio De Flag WRP

The Rio de Flag Plant, another advanced wastewater treatment facility, is capable of treating 4 million gallons per day via screening, primary sedimentation, aeration, secondary sedimentation, filtration, and disinfection. The plant uses the Bardenpho process — a two-stage anoxic / aerobic process designed to reduce the nitrogen content in wastewater. Because of the plant’s location near the center of Flagstaff, the decision was made to use ultra-violet radiation for disinfecting rather than the traditionally used chlorine gas.

The Rio de Flag Wastewater Reclamation Plant is located at 600 Babbitt Drive, Flagstaff, Arizona. 86001.

Rio de Flag WWTP