TUCSON, Ariz. (KGUN) — A new Federal report suggests cities like Tucson may have to brace for getting less water from the Colorado River. Arizona is one of seven states that get a large share of their water from the Colorado River. The canals of the Central Arizona Project carry river water to Phoenix and Tucson. We've protected our groundwater as much as possible while at the same time importing Colorado River water the last 25 plus years and storing it underground.” The Federal Government has not said how much it may reduce what states can take from the Colorado River.