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In the polymeric title compound, [Cd(C7H4O6S)(C11H6N2O)(H2O)2]n, the Cd2+ atom is seven-coordinated by two water O atoms, by three O atoms from two 2-hydroxy-5-sulfonatobenzoate (Hssal2−) ligands and by two N atoms from a 4,5-diazafluoren-9-one (Dafo) ligand in a distorted pentagonal–bipyramidal geometry. The Cd2+ atoms are monodentately coordinated by the sulfonate group of one Hssal2− ligand and bidentately coordinated by the carboxylate group of another Hssal2− ligand, generating zigzag chains running parallel to [010]. The chains are linked by O—H...O hydrogen bonds into a three-dimensional architecture.