Article L5211-28-3 of the French General Code of Local Authorities
A public establishment for inter-municipal cooperation with its own tax system and its member municipalities may decide, by concordant deliberations of the deliberative body of the public establishment and of the municipal councils, adopted by a majority of at least two-thirds of the municipal councils of the member municipalities of the public establishment representing more than half of the population of the latter or by at least half of the…