Republican Gov. Doug Ducey and Democratic Rep. Raúl Grijalva don’t agree on much, but both worry California could take Arizona’s water. The conservative governor and the liberal congressman say Arizona must be vigilant to ensure its drought-parched neighbor doesn’t use federal action to grab some of Arizona’s Colorado River supply. Of particular concern is a California drought bill that’s been quietly negotiated for months in the U.S. Senate. “The secrecy generates concern and nervousness. Nobody I know in Arizona knows what’s in this bill at this point,” says Chuck Cullom, who manages Colorado River issues for the Central Arizona Project,...