This map shows the mean annual concentrations of phosphate (orthophosphate, OP) as mg/L PO4-P measured at Eionet-Water River monitoring stations during 2011. All data are annual means. For most countries these are based on measurements over the whole year, whereas some countries have samples only from the growing season (due to ice cover in winter).
The purpose of the map is to provide an overview of the annual concentrations of the orthophosphates in rivers across Europe and to enable viewer to make comparisons of the values in European countries, River basin districts or in individual monitoring sites. High or increased (compared to reference condition) concentration of Phosphate represents a risk to normal functioning of River ecosystems, causing eutrophication with potentially excessive growth of benthic algae or other aquatic vegetation, oxygen deficiency in the bottom substrate and reduced biodiversity.