Most of the world's almonds (80% or so) are from California, amazingly enough! Therefore, if you want to avoid California almonds, it would be a good idea to avoid any that don't have clear information about their source. I do eat almonds for calcium, but I am concerned about this, and the water use.
As to whether they are vegan, that's a grey area, but I voted yes. Would rice or bread not be vegan if some animals were tilled to work the land. Anyway, who cares whether it's vegan or not. The key question is to whether it's morally appropriate.
It would probably be better to avoid them ideally, but they are one of the few none-animal products with high calcium levels. Vegans avoiding almonds might want to keep an eye on their calcium intake.