Article L5816-8 of the French General Code of Local Authorities
The distribution between the interested communes of the expenditure decided by the syndicate commission is made by the municipal councils. In the event of disagreement between the municipal councils on the distribution of expenses, the State representative in the department decides. Expenditure charged to the municipalities is compulsory expenditure in respect of which, if necessary, action is taken in accordance with the provisions of article L. 1612-15.