IAPMO: International Association of Plumbing and Mechanical Officials

IAPMO, the International Association of Plumbing and Mechanical Officials, is a nonprofit organization that develops and publishes standards focused on plumbing products. Headquartered near Los Angeles, United States, IAPMO develops the Uniform Plumbing Code, used throughout the United States, as well as having voting members around the world. In addition to developing IAPMO standards, IAPMO also offers extensive certification and testing services. Standards from IAPMO are available both individually, directly through the ANSI webstore, and as part of a Standards Subscription. If you or your organization are interested in easy, managed, online access to standards that can be shared, a Standards Subscription may be what you need - please contact us at: [email protected] or 1-212-642-4980 or Request Proposal Price.

Below are IAPMO's best-selling standards. To find additional standards, please use the search bar above.



The provisions of this code shall apply to the erection, installation, alteration, repair, relocation, replacement, addition to, use, or maintenance of plumbing systems within this jurisdiction.

ANSI Z124.1.2-2005

Plastic bathtub and shower units

The purpose of this standard is to establish minimum performance requirements for plastic bathtub or shower units. Conformance to this standard and test procedures herein shall indicate the acceptability of a plastic bathtub or shower unit as a plumbing fixture.

CSA B45.8-2018/IAPMO Z403-2018

Terrazzo, Concrete, and Natural Stone Plumbing Fixtures

This standard covers terrazzo, concrete, and natural stone plumbing fixtures and specifies requirements for materials, construction, performance, testing, and markings of these fixtures.


Uniform Mechanical Code

The 2012 edition of the Uniform Mechanical Code (UMC) represents the most current approaches in the mechanical field. It is the fourth edition developed under the ANSI Consensus process is designated as an American National Standards by the American National Standards Institute (ANSI). Contributions to the content of this code were made by every segment of the built industry, including such diverse interests as consumers, enforcing authorities, installers/maintainers, labor, manufacturers, research/standards/ testing laboratories, special experts and users. The UMC provides complete requirements for the installation and maintenance of heating, ventilating, cooling and refrigeration systems, while at the same time allowing latitude for innovations and new technologies.

IAPMO/ANSI Z124.5-2013e1 (R2018)

Plastic Toilet Seats

This standard covers plastic toilet seats (including toilet seat covers) and specifies requirements for materials, construction, performance testing, and markings. The requirements of this Standard are not intended to prevent the use of alternative materi

IAPMO Z1000-2019

Prefabricated Septic Tanks

This standard covers prefabricated septic tanks made of concrete, fiber-reinforced polyester (FRP), thermoplastic, or steel, intended for use in residential or commercial sewage disposal systems, and specifies design, material, performance testing, and marking requirements.

ANSI Z124.3-2005

Plastic lavatories

The purpose of this standard is to establish minimum performance requirements for plastic lavatory units. Conformance to this standard and test procedures herein shall indicate the acceptability of a plastic lavatory unit as a plumbing fixture.

IAPMO IGC 193-2020

Safety plates, plate straps, notched plates and safety collars

Safety plates, plate straps, and safety collars covered by this standard are intended foruse in protecting pipes running through walls, top and sole plate.This standard strictly applies to safety plates and plate straps used solely as protectiondevice and

IAPMO PS 117-2019

Press and Nail Connections

IAPMO PS 117-2018 covers press and nail connections made with (a) copper or copper alloy fittings and Type K, L, and M copper tube; (b) carbon steel fittings and Schedule 10 and 40 carbon steel pipe;  (c) stainless steel fittings and Schedule 5, 10, and 40 stainless steel pipe; or (d) stainless steel fittings and stainless steel pipe complying with the dimensions specified in Table 1.  This Standard specifies requirements for materials, physical characteristics, performance testing, and markings.  Products covered by this Standard include fittings, tube, and pipe with press or nail connection ends combined with other types of connections (e.g., threaded, soldered, and push-fit).  Carbon steel fittings and pipe covered by this Standard are not intended to be used in plumbing systems.