The recreational activities in bathing water have a beneficial impact on health and wellness. However, these activities are not exempt from risks such as drowning or diving accidents. Moreover, some risks are often consequences of clearly visible events, such as seaweed flowerings or mucilage aggregates. In addition, some organism with blistering apparatus can be the cause of serious effects for people. A lot of studies were made to evaluate causes and effects of risk exposure in bathing water activities. The World Health Organization (WHO) has analyzed quality and results of these studies and in 2003 published "Guidelines for safe recreational water environments, coastal and fresh waters". The Guidelines can be considered the scientific base for the elaboration of the text of the new Directive on bathing water. These guidelines are available to be directly consulted for a deeper examination of the issues concerning bathing water.