In the title compound, [Cd(C8H4O4)(C10H8N2)(H2O)2] n , the Cd atom has a distorted trigonal-prismatic coordination geometry, bonded to two N atoms from the 2,2′-bipyridine ligand, two water O atoms and two O atoms from two different phthalate ligands, thereby producing a linear coordination polymer. The crystal structure is stabilized by π-π inter-actions [centroid-to-centroid distance = 3.766 (3) Å] and hydrogen bonds...