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In the structure of the 1:1 proton-transfer compound of 4-methyl­pyridine (γ-picoline) with 4,5-dichloro­phthalic acid, C6H8N+·C8H3Cl2O4·H2O, determined at 200 K, the 4,5-dichloro­phthalate anions are bridged by the water mol­ecule through O—H...Ocarbox­yl hydrogen bonds, giving zigzag chains which extend along the c-axis direction. The 4-methyl­pyridinium cations are linked to the chains through single N—H...Owater hydrogen bonds and occupy the voids within the chains in the one-dimensional structure. The anions have the common `planar' conformation with a short intra­molecular O—H...Ocarbox­yl hydrogen bond.
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