Article L5111-1-1 of the French General Code of Local Authorities
I. – When their purpose is to ensure the joint exercise of a competence recognised by law or transferred to their signatories, the agreements concluded between the départements, the Lyon metropolis, the regions, their public establishments, their groupings, the municipalities belonging to the Greater Paris metropolis and the mixed syndicates provide for: – either the provision of the service and equipment of one of the co-contracting parties to the agreement…