The pyridine N atom of the cation in the title hydrated salt, C13H11N2 +·NO3 −·H2O, is protonated; the N atom of the NH2 group shows a planar conformation. The former N atom is hydrogen bonded to a water molecule. The amino group is involved in three N—H⋯O hydrogen bonds with two neighboring nitrate anions. The water molecule is hydrogen bonded to two adjacent nitrate anions. In the crystal, this results in a layered network
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