Updated 2026-09-07

Building Code Glossary

Plumbing Fixture: Building Code Definition

How the IRC 2009, IPC 2009 define plumbing fixture, where the wording differs, and which chapters depend on the term.

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Last updated September 7, 2026 · Definitions quoted from the 2009 International Codes as transcribed in this site's building-codes collection, with the source chapter linked for each quotation. Usage counts are computed over the chapters hosted here, one copy per code. The [ICC code library](https://codes.iccsafe.org/codes) publishes the current model text and the [ICC adoption maps](https://www.iccsafe.org/advocacy/code-adoption-maps/) show which edition a jurisdiction has adopted; those sources control.

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Direct answer

Plumbing fixture is a defined term in the International Residential Code (IRC) 2009, in Definitions. The code's own words are: “A receptor or device that requires both a water-supply connection and a discharge to the drainage system, such as water closets, lavatories, bathtubs and sinks. Plumbing appliances as a special class of fixture are further defined.” The IPC 2009 defines the same term with different wording, so the controlling text depends on which code governs the question in front of you — the comparison below sets the versions side by side. The term is used in 19 chapters of this corpus, most often in Fixtures, Faucets and Fixture Fittings (IPC 2009), Plumbing Fixtures (IRC 2009), Definitions (IPC 2009). These pages transcribe the 2009 model text; verify the definition against the edition and amendments your authority having jurisdiction has adopted.

Content and cited inputs reviewed by Scott Barrington, Harth founder and architectural technology specialist · Published 2026-09-07 · Updated 2026-09-07.

What does this term mean?

Plumbing Fixture — IRC 2009, Definitions:

A receptor or device that requires both a water-supply connection and a discharge to the drainage system, such as water closets, lavatories, bathtubs and sinks. Plumbing appliances as a special class of fixture are further defined.

Labeled code-term definition diagram: Plumbing Fixture: Building Code Definition — How the IRC 2009, IPC 2009 define plumbing fixture, where the wording differs, and which chapters depend on the term.

What must be verified before using this guidance?

Two of the I-Codes in this corpus define Plumbing Fixture, and the wording is not identical — read the version that governs your question.

Code	Where it is defined	Definition
IRC 2009	Definitions	A receptor or device that requires both a water-supply connection and a discharge to the drainage system, such as water closets, lavatories, bathtubs and sinks. Plumbing appliances as a special class of fixture are further defined.
IPC 2009	Definitions	A receptacle or device that is either permanently or temporarily connected to the water distribution system of the premises and demands a supply of water there-from; discharges wastewater, liquid-borne waste materials or sewage either directly or indirectly to the drainage system of the premises; or requires both a water supply connection and a discharge to the drainage system of the premises.

Where plumbing fixture is used in the code

The term appears in 19 chapters of the 2009 I-Codes hosted here. The chapters that lean on it hardest are the ones to read next.

Chapter	Code	Mentions
Fixtures, Faucets and Fixture Fittings	IPC 2009	21
Plumbing Fixtures	IRC 2009	18
Definitions	IPC 2009	15
Definitions	IRC 2009	11
Building Planning	IRC 2009	10
Water Supply and Distribution	IPC 2009	9
Water Supply and Distribution	IRC 2009	8
Plumbing Systems	IBC 2009	6
General Regulations	IPC 2009	6
Sanitary Drainage	IPC 2009	6
Traps, Interceptors and Separators	IPC 2009	4
Sanitary Drainage	IRC 2009	4

7 further chapters mention the term.

The term in use

How the code actually writes about plumbing fixture, quoted from the 2009 text hosted here:

The supply lines and fittings for every plumbing fixture shall be installed so as to prevent backflow.

— IPC 2009 §405.1

The supply lines and fittings for every plumbing fixture shall be installed to prevent backflow.

— IRC 2009 §P2902.2

Every plumbing fixture, device or appliance requiring or using water for its proper operation shall be directly or indirectly connected to the water supply system in accordance with the provisions of this code.

— IPC 2009 §301.4

The terms plumbing fixture is built out of

The definition above leans on 5 other defined terms. Each carries its own code definition, and a local amendment to any of them changes what plumbing fixture covers:

Drainage System — IPC 2009: Piping within a public or private premise that conveys sewage, rainwater or other liquid wastes to a point of disposal.
Receptacle — IRC 2009: A receptacle is a contact device installed at the outlet for the connection of an attachment plug.
Plumbing — IRC 2009: For the purpose of this code, plumbing refers to those installations, repairs, maintenance and alterations regulated by Chapters 25 through 33.
Premises — IMC 2009: A lot, plot or parcel of land, including any structure thereon.
Receptor — IRC 2009: A fixture or device that receives the discharge from indirect waste pipes.

Plumbing Fixture: what to open, and in what order

Every row is a document this term depends on. The ICC code library and the ICC adoption maps cover the middle rows.

Check	Where	Confirmed
Read the definition in the adopted IRC	Definitions
Read the definition in the adopted IPC	Definitions
Re-check the requirement that uses it	Fixtures, Faucets and Fixture Fittings (IPC 2009)
Re-check the requirement that uses it	Plumbing Fixtures (IRC 2009)
Re-check the requirement that uses it	Definitions (IPC 2009)
Re-check the requirement that uses it	Definitions (IRC 2009)
Confirm the dependent definition	Drainage System
Confirm the dependent definition	Receptacle
Confirm the dependent definition	Plumbing
Local amendment to any of the above	Jurisdiction's amendment list

A research aid, not a code determination. The authority having jurisdiction decides which edition and which amendments apply.

Sources and method

Definitions quoted from the 2009 International Codes as transcribed in this site's building-codes collection, with the source chapter linked for each quotation. Usage counts are computed over the chapters hosted here, one copy per code. The ICC code library publishes the current model text and the ICC adoption maps show which edition a jurisdiction has adopted; those sources control.

Source links

Frequently asked questions

What is the code definition of plumbing fixture?

The International Residential Code (IRC) 2009 defines it in Definitions as: “A receptor or device that requires both a water-supply connection and a discharge to the drainage system, such as water closets, lavatories, bathtubs and sinks. Plumbing appliances as a special class of fixture are further defined.” The 2009 model text is reproduced here; the definition that binds your project is the one in the edition your jurisdiction has adopted, as amended locally.

Which parts of the code depend on plumbing fixture?

In this corpus the term is used across 19 chapters, led by Fixtures, Faucets and Fixture Fittings in the IPC 2009. Those are the sections whose scope moves if the definition is amended locally, so read them together with Chapter 2 rather than on their own.

What is considered a plumbing fixture?

In the 2009 I-Codes hosted here it is a defined term rather than a description. The IRC 2009 states, in Definitions: “A receptor or device that requires both a water-supply connection and a discharge to the drainage system, such as water closets, lavatories, bathtubs and sinks. Plumbing appliances as a special class of fixture are further defined.” It is defined in IRC 2009, IPC 2009. Because it is a defined term, whatever the adopted edition says it means is what every section using it means — so check Chapter 2 of that edition and any local amendment before relying on this wording.

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