In the title compound, C(18)H(14)BrN(3)O(2)·H(2)O, the dihedral angle between the mean planes of the benzene ring and the quinoline ring system is 34.2 (3)°. In the crystal, the constituents are linked into chains by O-H⋯O, N-H⋯O and O-H⋯N hydrogen bonds.