Provision 13 January 2005 (Italy) gives guidelines for legionellosis control and prevention in hotel and thermal establishments. Considering that Legionella pneumophila is an ubiquitous organism , the implementation of actions to control the risk of Legionella in the water distribution systems of various types of establishments (hospital, hotel, thermal), or to at least reduce it to acceptable levels, is warranted. The authors have prepared a plan of action for Legionella which, besides describing the main points of the provision and the roles of managers and technicians, also includes the data sheets to be used during environmental monitoring procedures. The action plan will be freely available through local health authorities and professional associations.