Legionella is an environmental bacteria and is found widely in nutrient rich, moist warm and stagnant environments such as rivers streams ponds and soil.
However legionella can also thrive in man-made water systems such as cooling systems, humidifiers, domestic hot and cold water systems and spa pools.
It can be found in most common public places such as leisure facilities, hospitals and offices so it is important for your facilities operators to keep on top of legionella prevention.
Most importantly the bacteria becomes harmful when it is transmitted as an aerosol and inhaled through pathways such as showers and cooling systems and leads to Legionnaires Disease.
It is quite rare to contract it in your own home, but it does happen. Landlords have a duty to keep on top of legionella prevention and regular checks for the safety of their tenants.