Homstølvatn or Eptevatn is a lake in the far western part of Froland Municipality in Agder county, Norway. It is located about east of the village of Byglandsfjord (in Bygland Municipality) and about northwest of the village of Mykland in Froland Municipality.
The lake was expanded in 1973 when a dam was built at the south end of the lake Eptevatn for the purposes of hydroelectric power generation. The dam made the lake larger so that it now includes the formerly separate lake Homstølvatn as one large lake. The lake is now large and it holds about as a reservoir for the power station.
See also List of lakes in Aust-Agder List of lakes in Norway
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