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Plumb,
Not necessarily true regarding code adoption. I work in PA and the entire state has adopted the ICC series including the IPC. 35 of 50 currently use the IPC.
MD has adopted state wide the IBC building code and NEC elec code as well.... seems plumbing is a bit of a free for all if it's county by county. I've never used the NPC myself but doubt there's much difference between it and either the IPC or UPC.
States and local folks have no business writing code..... Most are just ICC books with someone elses cover on it for feel good effect.
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