Di-aqua-bis-(2-ethyl-5-methyl-imidazole-4-sulfonato-κ(2) N (3),O)nickel(II) dihydrate.

In the title complex, [Ni(C6H9N2O3S)2(H2O)2]·2H2O, the Ni(II) atom lies on an inversion center and is chelated by N and O atoms of two symmetry-equivalent imidazole-sulfonate ligands in the basal plane, and two water O atoms in axial positions in an overall octa-hedral configuration. The crystal structure displays O-H⋯O and N-H⋯O hydrogen bonds, which connect the components into an extended three-dimensional network.