Is it true or false that cold water samples should not be collected when sampling plumbing systems for Legionella?

The statement that cold water samples should not be collected when sampling plumbing systems for Legionella is false. Cold water systems can be significant reservoirs for Legionella bacteria, and sampling these systems is essential for a comprehensive assessment of potential risks.

In plumbing systems, cold water can become contaminated through various means, including biofilm accumulation, temperature fluctuations, and other environmental factors that may contribute to Legionella proliferation. Collecting cold water samples helps to accurately assess the presence and concentration of Legionella bacteria. This information is critical for determining the effectiveness of any management strategies and for carrying out risk assessments required by guidelines and regulations governing Legionella control.

Therefore, sampling both hot and cold water systems is a fundamental part of the overall evaluation process in managing Legionella in plumbing systems.