Yuma Desalting Complex

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The Yuma Desalting Complex is one of three components authorized under Title I of the Colorado River Basin Salinity Control Act. The Desalting Complex Unit reduces the quantity and improves the quality of saline irrigation drainage water pumped from the shallow aquifer beneath the farmlands of the Wellton-Mohawk Division of the Gila Project. The major feature of the Desalting Complex Unit is a reverse osmosis membrane desalting plant. This plant reduces the salinity of pumped drainage water from the Wellton-Mohawk Irrigation and Drainage District before the water is returned to the Colorado River. The plant site is located approximately four miles west of Yuma, Ariz., near the Arizona Public Service Company's Yucca power plant. Until officially named the Yuma Desalting Plant, it was known as the Yucca Site. The desalting plant has the capacity to treat more than 97,000 acre-feet of feed water per year at about 2,900 parts per million of total dissolved solids.