Article L5211-17 of the French General Code of Local Authorities
Municipalities that are members of a public establishment for inter-municipal cooperation may at any time transfer, in whole or in part, to the latter, some of their competencies whose transfer is not provided for by law or by the founding decision, as well as the property, equipment or public services necessary for their exercise. These transfers are decided by concordant deliberations of the deliberating body and the municipal councils deciding…