The fee payable each year to a municipality for the occupation of the municipal public domain by water supply and sewerage works is determined by the municipal council within the limits of a ceiling set at 1 January 2010 at 30 euros per kilometre of network, excluding connections, and 2 euros per square metre of floor space for non-linear built structures, excluding sewerage network manholes.
These ceilings change on 1 January each year, in proportion to the change in the “engineering” index, defined in the Journal officiel of 1 March 1974 and published in the Bulletin officiel du ministère chargé de l’équipement, measured over the twelve months preceding the publication of the index known on 1 January.