Know the Code Words: Key Definitions in SPS 381

Understanding the Wisconsin Plumbing Code starts with speaking the same language—and that means knowing the definitions found in Wisconsin Administrative Code Chapter SPS 381. In this episode, Ryan breaks down essential terms like building drain, plumbing appliance, storm sewer, trap seal, backwater valve, and more. With over 365 code-defined terms—including more than 100 related to POWTS—precise terminology is key to clear communication, proper design, and passing inspections.

You’ll hear the verbatim definition of a “water closet” from SPS 381.01(278) and learn how choosing the right words affects pipe sizing, venting, and layout decisions. Ryan also explains the difference between terms like branch of a building drain and building drain branch—subtle distinctions with major implications.

Referenced source:
Wisconsin Department of Safety and Professional Services (DSPS). (2024). Wisconsin Administrative Code SPS Chapters 381–387: Plumbing Code. Retrieved from https://dsps.wi.gov

Ryan also shows you how to find the full code online and introduces the Wisconsin Plumbing FAQ page, which will be featured in next week’s episode.

If you know what to call a pipe, you know how to size it—and this episode helps you do both.