Toxigenic cyanobacteria are one of the main health risks associated with European water resources. They produce a wide range of potent toxins with adverse health effects on humans and animals exposed to them via drinking water, aquaculture and recreation. European research in the field has generated significant risk management capability, although this is regionally unbalanced. This proposal aims to transfer this knowledge and know-how to all European regions: widening awareness, spreading relevant technical competence, and sharing risk management expertise. The proposal aims to provide tools to end-users (public authorities, water utilities, aquaculture, tourism and recreation sectors) by pooling and coordinating expertise throughout Europe and to harmonize methods and practices across Europe, thereby protecting public health, enterprises and investments. This Action arrival is extremely timely because new challenges in the field have appeared recently including emerging toxins and cyanobacterial species hitherto unknown in Europe, plus the preparation of new legislation and regulations in some European countries. Over 40 partners (scientists, other professionals and companies), from 23 European countries, are participating in this proposal. The coordination – networking tools provided by COST are the most suitable and will be used to achieve the Action's goals.