Wisconsin plumbing code: which edition applies and what it requires

Does Wisconsin use the IPC or the UPC?

Neither. Wisconsin writes its own state plumbing code, Wisconsin's SPS 382 (the Wisconsin Plumbing Code), rather than adopting the IPC or UPC model code.

Because it is state-written, its requirements and section numbering are unique to Wisconsin. The adopted code is the Chapter SPS 382, Wisconsin Administrative Code (the Uniform Plumbing Code of Wisconsin).

What edition of the plumbing code does Wisconsin use, and when did it take effect?

Wisconsin's current edition is SPS 382 (2023 update), effective 2023-10-01 (SPS 382.32), adopted by the WI Dept of Safety and Professional Services (DSPS), Division of Industry Services.

Codes update on a multi-year cycle, and an adopted-but-not-yet-effective edition can circulate near a changeover. Confirm which edition your project falls under by its permit date and your local jurisdiction.

How do local jurisdictions affect Wisconsin's plumbing code?

Wisconsin's code is the statewide baseline, but local jurisdictions enforce it and may add amendments. The local authority having jurisdiction (AHJ) resolves how it applies to a specific project.

Statewide uniform state-written code; DSPS rulemaking. Confirm any local amendments and the accepted trap-seal methods with your city or county building department before relying on a provision.

What does the plumbing code require for floor drains and trap seals?

Floor drains rely on a trap, and the code requires that trap seal to be maintained. A floor drain that receives little water can lose its seal to evaporation, which opens a path for sewer gas, odors, and pests.

To prevent that, codes recognize trap seal protection methods. The two most common are a trap seal primer (which adds water to the trap) and a barrier-type floor drain trap seal protection device (which provides a mechanical seal). The right approach depends on the drain, the space, and the AHJ.

Wisconsin places this in SPS 382.32, which requires barrier-type floor drain trap seal protectors to conform to ASSE 1072 and recognizes them as a means of trap seal protection.

Are barrier-type (ASSE 1072) trap seals allowed under Wisconsin's code?

Yes. Wisconsin's state code names them directly.

SPS 382.32 requires barrier-type floor drain trap seal protectors to conform to ASSE 1072 - one of the clearer state-code recognitions of these devices. For a floor drain at risk of a dry trap, a barrier device is a code-named means of trap seal protection; acceptance for a specific install rests with the AHJ (DSPS or the local plumbing inspector).

Do I need a permit to add a floor-drain trap seal in Wisconsin?

Usually not for the device itself, but always confirm with your local authority having jurisdiction.

A drop-in barrier-type trap seal device generally does not require a plumbing permit because it does not alter any piping, similar to changing a drain grate. On new construction or an already-permitted renovation, include it in the plumbing specifications.

In Wisconsin, plumbing permits and inspections run through WI Dept of Safety and Professional Services and the local building department, and a licensed plumber pulls permits for plumbing work. Licensing rules and reciprocity vary, so confirm them with the authority or your local jurisdiction.

Where can I read Wisconsin's plumbing code?

The adopting authority and code text are linked below. Always confirm current requirements against the adopted code and your local AHJ.

• docs.legis.wisconsin.gov/code/admin_code/sps/saf...
• www.law.cornell.edu/regulations/wisconsin/Wis-Ad...