Black Sea Water Quality Database (BS WQD; http://blackseadb.org/login.php) was developed within the framework of the EU/UNDP EMBLAS-II and EMBLAS-Plus projects. The data are being collected through the Excel-based Data Collection Templates that were customized to accommodate information from the Joint Black Sea Surveys and National Monitoring Studies in Georgia, Russian Federation and Ukraine carried out in the 2016 – 2019 period. The database contains a wide range of data on physicochemical, chemical and biological parameters.