Water bodies failing to achieve good chemical status in 2021 (third RBMP) by river basin district – with ubiquitous PBTs (left) and without (right)

The map shows the percentage of European surface water bodies failing to achieve good chemical status in 2021, by River Basin District under the EU Water Framework Directive. The map on the left shows the status for all Priority Substances, while that on the right shows the status without the subset of ubiquitous Persistent, Bioaccumulative and Toxic substances (uPBTs) set by the Environmental Quality Standards Directive. Most failures of chemical status owe to the presence of mercury and brominated diphenylethers, which are both uPBTs.