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Total phosphorus in lakes

There has been a gradual reduction in average total phosphorus concentrations in European lakes since 1992. The concentration level is higher for the shorter, more representative time series. As the treatment of urban waste water has improved, the amount of phosphorus in detergents has been reduced, and many waste water outlets have been diverted away from lakes, phosphorus from point sources has become less significant. However, diffuse runoff from agricultural land continues to be a major phosphorus source in European lakes. Moreover, phosphorus stored in sediment can keep lake concentrations high despite a reduction in inputs.

See chart for phosphorus in rivers and lakes here.