ASSE (Plumbing) LEC 2011-2022

Legionella reduction and treatment devices are designed to reduce the microorganisms in the genus Legionella (e.g., Legionella pneumophila) typically found in potable water systems. The 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 product 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.

The device reduces the quantity of Legionella bacteria that exit the device. Major components may include a disinfecting chemical inlet, mixing chamber, thermal element, housing, filtration media, and ultraviolet (UV) light source. The performance requirements in this standard are for full systems and are not intended to apply to components (i.e., filters).