-City of Belgrade, City Administration of the City of Belgrade, Secretariat for Communal and Housing Affairs
-Belgrade Land Development Public Agency
-City Administration of the City of Sabac-Ministry of Agriculture, Forestry and Water Economy, Belgrade
-Public Water Company „Srbijavode“ Belgrade
-Public Water Company „Vode Vojvodine“ Novi Sad
-City Administration of the City of Pozarevac
-PUC “Vodovod-Sabac” Sabac
-PUC “Vodovod i kanalizacija”, Obrenovac
-PUC "Vodovod i kanalizacija" Pozarevac
-PE “Infrastruktura” Sabac
-PUC “Stari grad” Sabac