Deadline March 1 to Submit Proposed Changes to 2021 NSPC

In order to facilitate the development of an updated National Standard Plumbing Code–Illustrated, the IAPMO NSPC Committee requests proposed changes to the 2018 NSPC. All proposals are due by March 1. Proposals accepted by the technical committee will appear in the 2021 National Standard Plumbing Code–Illustrated.

The National Standard Plumbing Code uses an annual review process and publishes the complete code every three years. For a copy of the code change form with instructions or more information on the National Standard Plumbing Code–Illustrated, visit

All proposed changes must be submitted in electronic form to If a standard is referenced, a copy of that standard must accompany the proposed code change that is submitted to the committee.

No proposals will be accepted after the 5 p.m. EST deadline on March 1.

IAPMO urges its members and other interested parties to get involved in the code development process. Designed to ensure the proper installation of plumbing systems, the NSPC provides local and state governments, code administrative bodies and the industry with a modern code to protect public health, safety and welfare.

For more information, contact the IAPMO NSPC staff at