2-[(E)-2-(4-Chloro­phen­yl)ethen­yl]-1-methylpyridinium iodide monohydrate

In the title compound, C(14)H(13)ClN(+)·I(−)·H(2)O, the cation is nearly planar and exists in an E configuration; the dihedral angle between the pyridinium and benzene rings is 0.98 (17)°. The cations stack in an anti-parallel manner along the a axis through two π–π inter­actions between the pyridinium and benzene rings [centroid–centroid distances 3.569 (2) and 3.6818 (13) Å, respectively]. The cation, anion and water mol­ecule are linked into a chain along the a axis by weak C—H⋯O and C—H⋯I inter­actions together with O—H⋯I hydrogen bonds and the chains are further connected into a three-dimensional network.