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In the title salt, C20H21Ninline image·C7H7SOinline image·H2O, the quinolinium cation exhibits a large molecular non-linear optical (NLO) response, as determined by Stark spectroscopy, but crystallization in the centrosymmetric space group Pinline image precludes significant bulk NLO effects. Intermolecular O—H⋯O and weak C—H⋯O hydrogen bonding links the constituent mol­ecules into a three-dimensional network.