I want to run a water line up close to the house. How deep is the run supposed to be?
If your in California it probably does not have to be very deep. Is this an irrigation pipe which would be drained? or is this a continuous pressure supply pipe for something? It only needs to be below frost depth I would guess 12"-18" but you should always check with your AHJ local Authority Having Jurisdiction, the Plumbing inspector or building inspector.
Hope that helps,
"I want to run a water line up close to the house. How deep is the run supposed to be?"
Depending on your location anything from a few inches in southern Florida to many feet in Minnesota.
Per code the line must be a minimum of 12" or 6" below your average frost line, whichever is greater.
Sorry about that. I didn't think about frost line living in San Diego. I will bury it 12 inches deep. I should be good with that. Thank you for your responses.