“Which devices, fixtures, and/or systems within my building are at highest risk for harboring Legionella?”
Should your Water Management Plan (WMP) Program Team decide to utilize environmental water sampling to validate the effectiveness of the WMP, ANSI/ASHRAE 188-2018 advises that these tests should be performed by a laboratory accredited to a nationally or internationally recognized standard (e.g., ISO/IEC 17025:2017), with Legionella included in the laboratory’s scope of accreditation.
Before environmental sampling is undertaken, a Sampling Plan should be formulated. This plan should list the devices and Points of Use (POUs) to be sampled, at what frequency sampling will be performed, what the acceptable control limits will be, and what the response protocol will be for any sample result(s) falling outside of the previously-established control limits.
Sample Point Examples
High risk devices (so classified because they aerosolize water into their surrounding environments) include, but are not limited to, the following:
Plumbing fixtures to consider include:
Systems within the building to consider sampling include:
Sampling Plan Strategy
A sampling plan strategy for potable (domestic) water systems in healthcare facilities has been promulgated by the New York State Department of Health Bureau of Water Supply Protection. This guidance can help you formulate your own building sampling plan. Their recommended sampling strategy includes:
For assistance in controlling your buildings waterborne pathogens risks, WMP’s, Sampling Plans, Risk Assessments, accredited third-party lab sampling, audits, supplemental and emergency disinfections, consultations, or any questions, contact your Chem-Aqua Water Risk Management Service Group today at: 1-866-209-3373
Written by: Dominick Tuzzo