For more than 30 years, IAPMO has developed American National Standards (ANS), initially as the Secretariat for the ANSI Z124 Technical Committee, and since 2005 as an ANSI-accredited standards development organization, thus changing the designation of the standards to IAPMO/ANSI.

Although IAPMO's standards have traditionally focused primarily on plumbing, in the last few years IAPMO has also developed national standards for solar heating systems and components.

IAPMO's national standards are developed via an open consensus process, in accordance with the ANSI Essential Requirements: Due process requirements for American National Standards and the IAPMO PP-1 Policies and Procedures for Consensus Development of American National Standards, and approved by the respective standards committee.

IAPMO Standards are subject to periodic maintenance. Suggestions for their improvement will be referred to the relevant IAPMO Standards Committee. To submit a proposal for change to a Standard, you may send the following information to the International Association of Plumbing and Mechanical Officials, Attention Standards Department, at and include “Proposal for change” in the subject line:
(a)  standard designation (number);
(b)  relevant section, table, or figure number, as applicable;
(c)  wording of the proposed change, tracking the changes between the original and the proposed wording; and
(d)  rationale for the change.

If you wish to serve on an IAPMO standards committee, please fill in the Membership Application Form and submit it to, together with your résumé.

IAPMO/ANSI Standards Development Process

ANSI Standards - Open Projects


Kyle Thompson, P.E
Telephone (909) 230-5534 m

Attention: Standards
4755 East Philadelphia Street
Ontario, CA 91761
United States

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