PRESS RELEASE

    ASSE International Publishes New Listing Evaluation Criteria (LEC) for Legionella Reduction and Treatment Devices

    ASSE International Publishes New Listing Evaluation Criteria (LEC) for Legionella Reduction and Treatment Devices

    Mokena, Ill. — ASSE International has published a new Listing Evaluation Criteria (LEC) standard — ASSE LEC 2011-2022, Product Performance Requirements for Legionella Reduction and Treatment Devices.

    Legionella reduction and treatment devices are designed to reduce Legionella microorganisms found in potable water systems. These devices reduce the number of the bacteria through inactivation and/or filtration. They can reduce or prevent the downstream bacterial colonization of a water system and thus ultimately the release of the bacteria into the water. Devices are intended to be used at point of entry (POE) or point of use (POU) in applications for hot or cold water, or both, for drinking water, washing hands or showering. This standard defines the performance requirements for those devices in order to reduce the downstream risk due to Legionella bacteria.

    “Consistency in experimental design means confidence in the results,” said Dr. Janet E. Stout, executive vice president and founder of Special Pathogens Laboratory and a Legionella researcher for more than 30 years. “ASSE LEC 2011 Standard provides a much-needed guide that specifically defines test requirements that will lead to reproducible and reliable results. These requirements include defining water chemistry and quality as well as how to test, recover and culture Legionella for demonstration of efficacy of devices that seek to show reduction or killing capacity. When device testing meets these requirements, you can have confidence in the results!”

    Legionnaires’ disease is a pulmonary infection brought on by the aspiration or inhalation of aerosolized Legionella bacteria. While there are always various species of microorganisms in the public water supply, Legionella has gained attention in recent years due to the rising number of identified individuals who contracted Legionellosis (i.e., Legionnaires' Disease, Pontiac Fever). Products conforming to ASSE LEC 2011-2022 reduce the quantity of potentially harmful Legionella bacteria that exit the device and help reduce downstream exposure risk.

    To purchase ASSE LEC 2011-2022, please visit the ASSE International Webstore at www.assewebstore.com. For questions regarding the LEC, contact Terry Burger, director of Product Standards, at terry.burger@asse-plumbing.org.

    ASSE International is an ANSI-accredited standards developer and product certification body composed of members representing all disciplines of the plumbing and mechanical industries. ASSE’s product performance standards, professional qualifications standards, professional certification and product listing programs aim to improve the performance and safety of plumbing and mechanical systems. Learn more about ASSE International at http://www.asse-plumbing.org/.


    IAPMO, ASPE, ASSE International, ARCSA International Join Into Renewed MoU Outlining Future Collaboration

    02 September 2025

    IAPMO® and the American Society of Plumbing Engineers (ASPE) have renewed a Memorandum of Understanding (MoU), now incorporating ASSE International and ARCSA International, to jointly advance and promote the mutual interests of education, regulations, design, specifications, installation, and inspection of plumbing systems, as well as training, testing and certifying qualified professionals to perform design work responsive to the need to conserve and protect water supplies, and reduce energy use connected to delivery and use of water.

    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.

    Scroll to top