4-Amino-3,5-di-chloro-pyridinium 3-hy-droxy-pico-linate monohydrate.

In the title hydrated salt, C5H5Cl2N2 +·C6H4NO3 -·H2O, the pyridine N atom of the cation is protonated and an intra-molecular O-H⋯O hydrogen bond is observed in the anion, which generates an S(6) ring. The crystal packing features N-H⋯N, O-H⋯O, N-H⋯O, C-H⋯Cl and C-H⋯O hydrogen bonds, which generate a three-dimensional network.