In the title compound, C(10)H(18)N(3)OS(+)·Cl(-)·2H(2)O, the three C atoms of the isopropyl group are disordered and were refined using a split-site mode [occupancy ratio 0.53 (3):0.47 (3)]. In the crystal, the cations, anions and water mol-ecules are connected via O-H⋯O, O-H⋯Cl, N-H⋯Cl and N-H⋯O hydrogen bonding.