Is it worth collecting both a pre- and post-flush hot water sample at faucets that seldom get used? True or False?

Collecting both a pre- and post-flush hot water sample at faucets that seldom get used is indeed worth the effort. The rationale behind this practice lies in the understanding of how stagnant water can lead to increased risk of Legionella growth. When a faucet is not frequently used, water sits stagnant in the pipes, providing an opportunity for bacteria such as Legionella to proliferate.

By obtaining a pre-flush sample, you can assess the level of Legionella present in the stagnant water. Following this, a post-flush sample allows for evaluation of the effectiveness of flushing in reducing bacteria concentrations. This two-step sampling process is critical because it provides valuable insights into the microbiological quality of water at that particular fixture and the effectiveness of interventions meant to ensure safe drinking water. It helps to determine whether regular flushing is an adequate control measure and whether additional actions may be necessary to mitigate health risks.

In summary, collecting both samples supports comprehensive monitoring and enhances the management of Legionella in plumbing systems, particularly in areas where water stagnation might be a concern.