In the title compound, [Cd(C(10)H(9)N(4)O(2)S)(2)(C(3)H(7)NO)(2)(H(2)O)]·H(2)O, the Cd(II) ion displays a grossly distorted octa-hedral (or irregular) mer-CdN(3)O(3) coodination polyhdron arising from its coordination by one N,N'-bidentate sulfadiazinate anion, one monodentate sulfadiazinate anion, two O-bonded dimethyl-formamide molecules and one water mol-ecule. A short Cd⋯N contact [2.890 (3) Å] to the monodentate sulfadiazinate ion also occurs. The dihedral angles between the planes of the aromatic rings of the anions are 86.81 (14) and 68.65 (14)°. The crystal structure features inter-molecular N-H⋯O, O-H⋯O and O-H⋯N hydrogen bonds.