The title compound, C17H27N3O2+ . 2I(-) . H2O, was synthesized from 1-( 2- morpholinoethyl) benzimidazole and ethyl iodide in dimethylformamide. In the molecule, the benzimidazole ring is connected to the morpholine ring by an ethylene group. The crystal structure is stabilized by inter- and intramolecular O - H ... I, C - H ... O and C - H ... I interactions.