Code

[worker]

Is there anybody from Chicago that can tell me if it's ok to run 4" pvc underground for a bathroom?

[Randyj]

Residential, commercial, inside, outside, under slab, crawl space? Not from that neck of the woods but around here anything goes when it's run to a septic tank. On sewers ductile iron is required from the building to the public sewer line. Local codes vary.

[kordts]

In Chicago you can use pvc for dwv in residential applications for 3 stories and under. That's aboveground. As far as underground goes, I don't know, but would guess the answer is no. Be aware, if this is permitted job, the inspector will tell you the answer. If you don't pull a permit and get caught, you are in big trouble. Unless you are an off duty fireman.