What key difference exists between cold water samples from a hotel bathroom faucet and a drinking fountain?

The key difference between cold water samples from a hotel bathroom faucet and a drinking fountain lies in the potential for Legionella contamination. Drinking fountains are often designed to provide water for consumption and may have features that reduce stagnation and biofilm accumulation, which are conditions conducive to Legionella growth. In contrast, hotel bathroom faucets can lead to stagnant water conditions that allow biofilms to form, creating an environment where Legionella can thrive if it is present.

Factors such as water temperature, flow rates, and the frequency of use also play significant roles in determining the risk of Legionella. In plumbing systems, areas that are less frequently used can lead to warm water sitting idle, which increases the likelihood of Legionella being present. Since hotel bathrooms might have more stagnant water than drinking fountains, the potential for Legionella contamination is typically higher in their cold water samples. This emphasizes the importance of regular monitoring and maintenance of water systems to ensure safety against Legionella growth.