Idaho Plumbing Code: Idaho State Plumbing Code (UPC-based) 2021

Idaho follows Idaho State Plumbing Code (UPC-based) 2021 as the basis for plumbing work. Permits and inspections are issued by the local Authority Having Jurisdiction (AHJ), which may publish additional amendments.

Current plumbing code adopted in Idaho — edition, key amendments, permit and inspection guidance. Updated 2026.