In the title compound, C(19)H(15)N(3)S·H(2)O, the benzothia-zole ring system forms a dihedral angle of 7.22 (1)° with the benzene ring and the benzene ring forms a dihedral angle of 80.89 (1)° with the pyridine ring. An intra-molecular N-H⋯O inter-action is present. The crystal structure is stablized by inter-molecular O-H⋯N hydrogen bonds, π-π [centroid-centroid distances = 3.782 (1), 3.946 (1) and 3.913 (1) Å] and C-H⋯π inter-actions, forming a three dimensional-network.