In the title compound, {[Cu(C 6H 5N 2O 2) 2]·2H 2O} n , the Cu II ion (site symmetry ) is coordinated by two N, O-bidentate ligands and two N-monodentate ligands in a distorted CuO 2N 4 octahedral geometry. Each anion acts as a bridge between two cations, thus forming a two-dimensional polymeric network parallel to the ab plane. The packing is consolidated by O—H⋯O hydrogen bonds. One of the O atoms of the ligand and both water molecules are disordered.