California’s biggest water project in decades appears to be in limbo after a key irrigation district voted not to help underwrite Gov. Jerry Brown’s plan to build two giant tunnels that would re-engineer water transport in the state. The no-vote at the Fresno-based Westlands Water District — the largest agricultural water supplier in the U.S. — puts the $17 billion project’s funding on shaky ground. Will other water districts pick up the slack? Other large water agencies considering participating in the project are set to vote soon. Another key player, Los Angeles’ Metropolitan Water District, will vote on October 10.