The title compound, C(6)H(8)N(3) (+)·Cl(-)·H(2)O, crystallizes with three formula units in the asymmetric unit. The cations are non-planar with the -C(NH(2))(2) groups twisted out of the ring planes. Each pyridine carboximidamidate cation is linked to another cation through N-H⋯N hydrogen bonds, to chloride ions by N-H⋯Cl hydrogen bonds, and to water mol-ecules by N-H⋯O hydrogen bonds. Water mol-ecules and chloride ions are also linked together via O-H⋯Cl hydrogen bonds. In the crystal, all these inter-molecular inter-actions result in a three-dimensional network.