MANTECA — California is providing health care to undocumented immigrants while President Donald Trump wants to build a border wall, and Gov. Gavin Newsom circumvented the White House with a side deal on auto emissions standards. But when it comes to water, Trump and California are closer than you might think. About 90 minutes from the deep blue coast, the predictable political fault lines stop at the Central Valley, home to the state’s $70 billion agricultural industry. Environmental laws, droughts and urban growth have led to a three-decade decline in farm water and stoked an acidic political logjam visible to anyone who’s driven down Interstate 5, the backbone of the state’s highway system.