Norsborg is a part of Botkyrka Municipality in Stockholm County, Sweden. Norsborg and Hallunda are continuous suburbs.Norsborg has the south-western terminus of the Stockholm metro system's red line. It was opened in 1975 and is the westernmost of all Stockholm metro stations.The largest fresh water plant serving Stockholm, Norsborg Water Works, has been there since 1904. It has a yearly capacity of 80,000,000 m³ of drinking water.