In the title complex, [Zn(C7H4NO3S)(2)(C8H22N4)]center dot H2O or [Zn(sac)(2)(paen)]center dot H2O [sac = saccharinate and paen = N,N '-bis(3-aminopropyl) ethylenediamine], the zinc cation is octahedrally coordinated. The equatorial plane of the octahedron is formed by N atoms of the paen ligand, whereas the axial positions are occupied by the carbonyl O atoms of the two sac ligands. One of the sulfonyl groups of the sac ligands shows disorder and was modelled with two different orientations and site occupancies of 0: 38 (1): 0.62 (1). The molecular packing is stabilized by intermolecular O-H center dot center dot center dot O and N-H center dot center dot center dot O hydrogen bonds between water molecules and neighbouring [Zn(sac)(2)(paen)] molecules, which form chains running parallel to . The crystal used was an inversion twin.