PRESS RELEASE

    Rainwater and Stormwater Standards Consensus Body Members Sought for Development of ARCSA/ASPE/IAPMO Standards 63 and 78

     Rainwater and Stormwater Standards Consensus Body Members Sought for Development of ARCSA/ASPE/IAPMO Standards 63 and 78

    Ontario, Calif. — IAPMO®, the American Society of Plumbing Engineers (ASPE) and ARCSA International are seeking technical experts to participate in the following consensus bodies:

    • Rainwater Standards Committee: This committee will be responsible for the update of ARCSA/ASPE/IAPMO 63 (Rainwater Catchment Systems)
    • Stormwater Standards Committee: This committee will be responsible for the update of ARCSA/ASPE/IAPMO 78 (Stormwater Harvesting Systems Design for Direct End-Use Applications)

    These standards were developed by a joint effort of ARCSA International (formerly the American Rainwater Catchment Systems Association) and ASPE. 
     
    ARCSA/ASPE/IAPMO 63 addresses the collection and use of rainwater from rooftops and other above-grade impervious building surfaces. 
     
    ARCSA/ASPE/IAPMO 78 covers stormwater harvesting systems, including new installations and modifications to existing systems. Its scope supports efforts to reduce watershed pollution, manage flooding, and recharge aquifers through sustainable stormwater reuse technologies.  
     
    These standards are critical in supporting the safe and effective design, installation, and maintenance of rainwater and stormwater harvesting systems. Their updating aids compatibility with new materials, technologies, and evolving codes, while maintaining a strong focus on public health and safety.  
     
    The development and update of these American National Standards Institute (ANSI)-accredited standards will provide jurisdictions and professionals with nationally recognized guidance that supports resilient water reuse systems. 
     
    “More than 10 years ago. ASPE saw a need to establish design guidelines for rainwater and stormwater harvesting systems and pioneered the development of these two quality standards," said ASPE Executive Director/CEO Billy Smith, FASPE. "We encourage plumbing engineers to participate in this consensus process to ensure that 63 and 78 continue to be the definitive resources for designers of these systems."   
     
    “These existing standards need to be brought up to date with corresponding language in other code related documents, specifically the Uniform Plumbing Code (UPC®),” said ARCSA International Executive Director Heather Kinkade. “ARCSA International has worked hard to align its language to other work being done around the water use and reuse code environment and these updates will reflect that work. Additionally, the stormwater reuse industry has grown immensely in the last few years, requiring a more divided guideline between rainwater and stormwater catchment standards.” 
     
    What Does a Consensus Body Member Do? 
     
    Consensus body members will:

    •  Help shape nationally recognized standards
    • Align content with applicable codes and emerging technologies
    • Help ensure the standards reflect current industry practices and terminology
    • Participate in the development process per IAPMO/ASSE PP-1, Policies and Procedures for Consensus Development of American National Standards 

    Who Should Apply?  
     
    IAPMO is seeking participation from a broad range of stakeholders, including but not limited to: 

    • Experts in rainwater and stormwater system design, installation, operation, or maintenance 
    • Professionals in engineering, plumbing, construction, and development
    • Representatives from local or state government, regulatory agencies, or Authorities Having Jurisdiction (AHJs)
    • Product manufacturers, facilities managers, and building operators
    • Members of the public or organizations with interest in water reuse and sustainability 

    About IAPMO’s Standard Development 
     
    For more than 30 years, IAPMO has been a leader in the development of American National Standards — initially as secretariat for the ANSI Z124 Technical Committee and, since 2005, as an ANSI-accredited Standards Development Organization. In 2018, IAPMO also received accreditation from the Standards Council of Canada (SCC) for the development of National Standards of Canada (CAN/IAPMO). 
     
    How to Apply 
    Applications for these committees can be submitted at IAPMO Standards Committee Membership Application by May 31. 
     
    For questions or additional information, please contact: 
     
    Terry Burger 
    (909) 519-0740 
    Terry.burger@iapmo.org


    Report on Comments Toward Development of 2027 UPC, UMC Now Available for Online Download

    01 August 2025

    IAPMO®, developer of the Uniform Plumbing Code (UPC®) and Uniform Mechanical Code (UMC®), has posted online the 2025 Report on Comments (ROC) for the 2027 editions of these American National Standard-designated model codes. The ROC includes the committee actions as discussed during the May 6-8 technical committee meetings, the electronic ballot results as balloted between May 19-June 16, and the Technical Correlating Committee actions on all comments received for the 2027 editions.

    IAPMO® Supports APEC Workshop in South Korea on Safe Drinking Water

    31 July 2025

    IAPMO®, a global team of experts engaging industry and government for a safer built environment, was proud to support the the Asian-Pacific Economic Cooperation (APEC) Workshop: Strengthening Standards and Technical Regulations for Safer Drinking Water – Developing an International Roadmap. The two-day workshop helped kick off the Third Senior Officials’ Meeting and Related Meetings (SOM3), which began July 26 and are slated to run through Aug. 15.

    Scroll to top