I know of a couple, there is this one in Placentia
http://www.thebruery.com
This one is around the corner from Honda Center literally, people tailgate & walk to the game from it
http://www.noblealeworks.com/
Also, J.T. Schmidts across the street from The Ponda has a brewery too I think.
Actually heard of the Bruery before but didn't realize exactly where in Southern California it was. Friend from highschool dating someone that works there and posts about it constantly on Facebook We will have to stop by that one!
I know you're trying to stick with smaller ones, but stone is a very good time. Roughly an hour away or so. Would definitely check it out.
Pizza port is also a great place for small brew and beer.
http://www.pizzaport.com/
Only trying to stick to smaller ones because of distribution. We get A LOT of Stone in liquor stores up here so we have had many a bomber from there. If we had more days we would probably go up there but with only one we kind of want to stick closer to the area we're staying. Stone rocks, though