Hansson had previously won the 50 meter butterfly and came third in the 100 meter medley and 50 meter backstroke.
Overall winners in the World Cup were the American Beata Nelson and Dylan Carter from Trinidad and Tobago.
Katie Ledecky, USA, was noted for a new world record in the 800m freestyle of 7.57.42 at the event.
ARCHIVE: Here Hansson won European Championship gold in the 100 meter butterfly (August 15):
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Louise Hansson takes EC gold in the 100 meter butterfly Photo: SVT