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In the Lake Sevan, average nitrate and phosphorus concentrations increased markedly between 2008-2012. This might be a consequence of an increase in the lake level, an attempt to restore the natural state of the lake (see Chapter 4.2); when water covered buildings, roads and forests on the lake shore  led to increased nutrient pollution. Average total phosphorus concentrations in the lake also increased between 2013-2017. Diffuse runoff from agricultural land and untreated domestic waste water continues to be significant sources of phosphorus pollution. These pollution sources do not have a big impact on the rivers in the region, but they affect Lake Sevan due to direct discharges into the lake. Moreover, phosphorus stored in bed sediment can keep lake concentrations high and prevent improvement of the water quality through management measures.