Copernicus has helped monitor the risk of eutrophication in coastal waters in the Epirus region in Greece. Here, the fishing community has benefited directly as they need information of water quality to make informed decisions for their production. Copernicus Sentinel-3 data were used for extracting information about important parameters such as chlorophyll, sea-surface temperature and water transparency. This is one example in a new publication that collects 99 stories from European public authorities.