The departments and the interdepartmental institution referred to in article L. 3451-1 may be responsible for all or part of the collective sanitation and stormwater management of municipalities located within the territory of the départements of Essonne, Seine-et-Marne, Val-d’Oise and Yvelines, under the conditions set out in an agreement with the municipalities, public establishments for inter-municipal cooperation or mixed syndicates concerned.