In 1999, AVEK joined forces with Palmdale Water District and Littlerock Creek Irrigation District, to form the Antelope Valley State Water Contractor’s Association, a joint powers authority. Together, the agencies optimize the use of water resources, protect surface water and groundwater storage.

In December 2016, AVEK and the California Municipal Finance Authority entered into a Joint Exercise of Powers Agreement, creating the Antelope Valley-East Kern Water Agency Financing Authority. This was done for AVEK to take advantage of lower interest rates that could be achieved through establishing a separate government agency. Both AVEK and the Financing Authority have the same Board of Directors.