Phosphate in rivers

Indicator refers to concentration of phosphate (PO4) in the dissolved phase of water samples, measured as milligrams per litre (mg PO4/L). Data are taken from river stations and aggregated to annual average values. At high levels, phosphate can cause water quality problems, such as eutrophication, by triggering the growth of macrophytes and algae. Only complete series after inter/extrapolation are presented. For details on the total of measuring stations and their distribution over the countries, please consult the metadata file.