To prevent Legionnaires' disease, the key strategies focus on controlling and reducing Legionella bacteria growth in water systems and environments where the bacteria may thrive.
Water System Maintenance
- Maintain water systems, including hot and cold water pipes, plumbing fittings, hot water systems, cooling towers, and air conditioners to prevent conditions favoring Legionella growth.
- Keep water temperatures controlled: hot water should be stored above 60°C and distributed above 50°C, while cold water should be stored and distributed below 20°C.
- Regularly flush and clean infrequently used water outlets like taps and showerheads to avoid stagnant water.
- Remove scale, sediment, and biofilm buildup through routine cleaning and disinfection.
- Avoid water stagnation by minimizing water reservoirs and standing water in systems.
- A competent person should inspect, monitor, and maintain water systems consistently per risk assessments.
Personal Precautions
- When handling soil, potting mix, and compost, reduce exposure by wetting down materials to limit dust, wearing gloves and a P2 dust mask, and washing hands afterward.
- Avoid inhaling dust from potting mixes as Legionella longbeachae can be present in soils.
Risk Management in Facilities
- Appoint responsible persons with authority and knowledge to manage Legionella risks.
- Carry out risk assessments regularly and implement control measures such as biocide treatments, temperature controls, and cleaning protocols.
- Follow maintenance schedules for air conditioning systems, spa pools, and other potential sources.
- Flush taps and showers in areas with low use, disinfect regularly, and test for Legionella in complex water systems.
Overall, preventing Legionnaires' disease involves maintaining clean, well- managed water and air systems, controlling temperatures, preventing water stagnation, and taking precautions with potential environmental sources like soil and potting mix.
