8-Hy-droxy-5,7-dimethyl-quinolin-1-ium chloride dihydrate

In the title hydrated salt, C11H12NO(+)·Cl(-)·2H2O, the quinoline ring system is essentially planar, with a maximum deviation of 0.005 (1) Å for all non-H atoms. In the crystal, the three components are linked by O-H⋯O, N-H⋯O, O-H⋯Cl and weak C-H⋯O hydrogen bonds, forming a layer structure parallel to the ac plane. The crystal structure is further stabilized by π-π stacking inter-actions, with centroid-centroid distances of 3.5213 (6) and 3.7176 (6) Å.