A federal judge has struck down Trump administration decisions that cleared the way for Cadiz Inc. to build a water pipeline across public land in the California desert. The ruling is a blow to the company’s decades-long effort to pump groundwater from beneath its desert property 200 miles east of Los Angeles and sell it to urban Southern California. Cadiz wants to use an existing railroad right of way across federal land to pipe supplies from its proposed well field to the Colorado River Aqueduct. In 2015, during the Obama administration, the U.S. Bureau of Land Management said Cadiz couldn’t use the right of way and would therefore have to obtain federal permission to run the proposed pipeline across surrounding federal land.