Basin electoral district in force

The basin districts are defined in the Order of 22 October 2007, which came into force since 1 January 2008. This Order repeals the amended Order of 14 September 1966 relating to the electoral districts of basin committees.
It defines each constituency as constituted by a list of municipalities located in the basins, as delimited by the Order of 16 May 2005 delimiting the SDAGEs, as amended by the Order of 27 December 2016.