In the title compound, C(24)H(18)N(6)O(2)S(3)·H(2)O, the thia-diazole ring makes dihedral angles of 78.00 (13) and 77.27 (13)° with the quinoline ring systems. In the crystal, mol-ecules are linked into a two-dimensional network by O-H⋯O and C-H⋯O hydrogen bonds.