Mississippi plumbing code: which code your jurisdiction uses and what it requires

Does Mississippi use the IPC or the UPC?

It depends on the jurisdiction. Mississippi has no single mandatory statewide plumbing code, so cities and counties adopt their own, some the IPC and some the UPC.

Because adoption is local, the only reliable answer is the one your city or county building department gives. Identify your jurisdiction first, then confirm the code and edition it enforces.

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

Mississippi has no single statewide plumbing code, so there is no one edition or effective date. Each city or county adopts its own code and updates it on its own schedule.

Editions in use vary across the state, so identify your jurisdiction first, then confirm the exact adopted code, edition, and effective date with its building department. That date governs which provisions apply to your project.

How do local jurisdictions set the plumbing code in Mississippi?

In Mississippi, local jurisdictions are the code authority. Each city or county adopts and amends its own plumbing code, and its building department is the AHJ.

Home-rule; MBCC minimum is a floor; locals layer amendments or opt out. Identify your city or county building department first, then confirm the code, edition, and amendments it enforces.

Does the plumbing code vary by city in Mississippi?

Yes. Key jurisdictions in Mississippi can differ, so the adopted code or edition changes from one city or county to the next.

There is no mandatory statewide code; the Mississippi Building Codes Council sets a discretionary IPC-based minimum and local governments adopt, amend, or opt out. Confirm the adopted edition and local amendments with your jurisdiction.

Pin down the exact jurisdiction before you specify or install, since the model code, edition, and amendments can differ between neighboring cities.

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.

Because Mississippi has no single statewide code, the exact section depends on whether your jurisdiction adopted the IPC (Section 1002.4.1) or the UPC (Section 1007). Both recognize barrier-type ASSE 1072 devices; confirm which applies locally.

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

It depends on the locally adopted code. Where a jurisdiction in Mississippi uses the IPC, a barrier-type ASSE 1072 device is a code-listed alternative (IPC 1002.4.1.4); where it uses the UPC, it is a recognized method (UPC Section 1007).

Because there is no single statewide code, acceptance is ultimately the local AHJ's call. Confirm your jurisdiction's adopted code and present the device's cUPC / ASSE 1072 listing.

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

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.

Because Mississippi has no single statewide authority, plumbing permits, inspections, and licensing are handled by your local city or county building department. Confirm requirements and licensing there.

Where can I read Mississippi's plumbing code?

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

• www.mid.ms.gov/sfmo/mississippi-uniform-building...
• codes.iccsafe.org/codes/mississippi
• bcapcodes.org/code-status/state/mississippi/