ASSE Legionella Assessment and Management for Plumbing Systems (LAMPS) Practice Exam 2025 – Comprehensive All-in-One Guide for Exam Success!

The correct choice focuses on the levels of chlorine residuals, which are a clear indicator of the effective management of Legionella risk in water systems. Chlorine is a well-known disinfectant that helps control microbial growth, including bacteria such as Legionella. Maintaining appropriate chlorine residual levels is essential for ensuring that any potential pathogens are effectively killed or inhibited in plumbing systems.

Monitoring chlorine residuals allows for an assessment of whether the disinfection strategies implemented are working effectively post-maintenance. If the chlorine levels are within the recommended range, it suggests that the system is being adequately disinfected, which reduces the risk of Legionella proliferation.

In contrast, while biofilms can harbor pathogenic bacteria, their presence does not provide a direct measure of risk management effectiveness. Temperature readings are important but do not directly indicate the effectiveness of disinfection as conditions can vary. Water turbidity levels can indicate particulate matter but do not specifically address microbiological safety or the presence of disinfectant in the water system. Thus, the focus on chlorine residuals provides a more precise measure of how well Legionella risk is being managed in the aftermath of maintenance activities.