Bacteria from the Legionellaceae family are one of the most common causative agents of atypical pneumonia. L. pneumophila, together with L. longbeachae, is the cause of 90% of infections with bacteria of the genus Legionella. Bacteria from these families are ubiquitous and can be found in anthropogenic and biogenic systems. They are isolated from various environmental sources such as rivers, sea and soil. Legionellosis is a significant public health problem, and we are actively working to combat it. Despite all the efforts legionellosis, which includes legionnaires ’disease and pontiac fever, are often undiagnosed, and when a diagnosis is set, the source of the epidemic often remains unknown. For many years, we have known classic sources of infections such as cooling towers, foam pools, blind pipe ends, humidifiers and others. A particular problem is the biofilm that forms in such environment. Legionella parasitize in amoebae, which makes it resistant to disinfection. There are many preventive measures that are implemented to suppress the reproduction of legionela and prevent the disease of legionellosis. This paper collects data from research related to the presence of legionela in compost and soil mixtures, rainwater, thermal springs, sea and wastewater. Also, for sources where cases were recorded, individual case reports have been explained. For all listed sources, except the sea, cases of the disease have been reported. Unlike conventional sources of legionellosis, accurate transmission pathaways and control measures for most environmental sources are not detected. This research showed the high prevalence of Legionella in the environment and the need for further research into potential Legionella habitats.