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The title compound, {[Cd(C8H8O5)(C10H8N2)]·H2O}n, was obtained by the reaction of cadmium acetate with 2,2′-bipyridine and 7-oxabicyclo(2.2.1)heptane-2,3-dicarboxylic anhydride. The CdII atom is seven-coordinated in a distorted pentagonal–bipyramidal configuration, defined by five O atoms from the carboxylate groups of three 7-oxabicyclo[2.2.1]heptane-2,3-dicarboxylato ligands and two N atoms from the 2,2′-bipyridine ligand. Two O atoms link two CdII atoms, forming a dinuclear center: the Cd—O—Cd bridging angle is 110.19 (6)°. The polymeric structure extends along [100] and is linked by intermolecular O—H...O hydrogen bonds involving the solvent water molecule. Extensive π–π stacking exists between 2,2-bypiridine ligands along [010] with centroid-centroid distance of 3.650 (2) Å