Ocean View's victory marks the first time an Orange County team took the Little League championship title.
Sunday's game at South Williamsport, Pa. was pushed back three hours due to rain brought on by Tropical Storm Irene, which is still surging north toward New England.
Nick Pratto singled with two outs and the bases loaded to bring the O.C. team to victory.
After the game, he said the thought of winning a championship had not yet sunk in.
"It's indescribable," said Pratto as he shook his head in disbelief. "I just hit the ball hard."
Other players described it as a dream come true.
With runners on first and second, an error by the shortstop on what could have been an inning-ending double play loaded the bases for Ocean View. After a force play at the plate, the 12-year-old Pratto smacked a solid liner off a 2-0 pitch for the game-winning hit.
He tossed his helmet into the air after rounding first before his teammates mobbed him in the infield.
"USA! USA!" yelled fans before Pratto's single.
The teams exchanged handshakes at the plate before California's giddy players posed at the mound with their new championship banner.
With the win, Ocean View became the first team ever from Orange County to clinch the Little League World Series championship.
The Associated Press contributed to this report.