In the title compound, 6C(9)H(10)N(4)S·H(2)O, the dihedral angle between the five-membered triazole ring and the phenyl ring is 44.33 (16)°. The solvent water molecule is disordered about a special position with symmetry and its occupancy cannot be greater than 0.1667. The crystal structure is stabilized by inter-molecular N-H⋯N and C-H⋯N hydrogen bonds.