The geodatabase on coastal Urban Waste Water Treatment Plant (UWWTP) was created in 2019 by AZTI for the European Marine Observation and Data Network (EMODnet). It is based on the dataset 'Waterbase-UWWTD' (Urban Waste Water Treatment Directive - reported data) provided by the European Topic Centre on Inland, Coastal and Marine waters, and made available at https://www.eea.europa.eu/data-and-maps/data/waterbase-uwwtd-urban-waste-water-treatment-directive-5. The dataset presents the available information (localisation, capacity and actual load treated, type of treatment, aggregated data on the performance of plants) on individual UWWT and collecting systems without UWWTP located in coastal NUTS3 regions, based on data selected from the reporting of Member States as part of the UWWTD implementation. It is available for viewing and download on EMODnet - Human Activities web portal (www.emodnet-humanactivities.eu). The geographic coverage is: Belgium, Bulgaria, Croatia, Cyprus, Denmark, Estonia, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Latvia, Lithuania, Malta, The Netherlands, Norway, Poland, Portugal, Romania, Slovenia, Spain, Sweden, United Kingdom. The description of all attribute fields of UWWTP is given in the Waterbase-UWWTD (https://www.eea.europa.eu/data-and-maps/data/waterbase-uwwtd-urban-waste-water-treatment-directive-5/waterbase-uwwtd).