ICC
International Plumbing Code
Published by International Code Council (ICC) · written for United States
iccsafe.org · checked 2026-09-23
Citing it here is not conformity with it, and this site holds no copy of its text.
- 5Calculators cite it
- 1Sections cited
- 3Editions listed
What it governs
The plumbing code for water supply, sanitary drainage, venting and storm drainage: fixture unit loading, pipe sizing, trap and vent arrangement, and the tests an installation has to pass. It sizes a system from fixture units rather than from measured demand, which is a deliberately conservative abstraction — the pipe it gives is the pipe a jurisdiction will accept, not the smallest pipe that would work.
Its scope stops at the building's connection: what happens in the main and at the treatment works is somebody else's document. Drainage fixture units and water supply fixture units are different quantities with the same name, and a value taken from the wrong table is out by a factor that looks plausible.
It governs arrangement as strictly as size. A correctly sized vent in the wrong position fails inspection, and no amount of extra pipe diameter compensates for a trap that can siphon.
Obtained from International Code Council. What ICC publishes
Editions
Published: 2024, 2021, 2018. A new edition every three years.
Adoption is not verified for your jurisdiction. A model document binds only where an authority adopted it, usually some editions behind and amended locally. Citing a clause is not conformance. No part of the text is reproduced here.