Outdoor pipes a code violation?

[Michelle Mapp]

Hi.  I am in Los Angeles County, CA and I need to figure out if running all the house's plumbing external to the house is up to code.  So basically, an owner had old galvanized pipes and instead of repiping correctly, he simply shut off the old system and ran new copper piping outside the house.    I am trying to figure out if this is a code violation and how this would impact sale.  

So, all pipes to sinks, toilets, washer, etc. are running outside the house and then new holes were drilled into the walls.  

I checked the 2013 CA Plumbing Code but it was really vague.  Who should I call?  Or where can I look for this information.