In the title compound, C(11)H(17)ClNO(+)·NO(3) (-), the side chain of the ethyl-ammonium group is orientated approximately perpendicular to the benzene ring, the dihedral angle between the C/C/N plane of the ethyl-ammonium group and the benzene ring being 79.40 (18)°. In the crystal structure, inter-molecular O-H⋯O and N-H⋯O hydrogen bonds are observed between the cation and the anion.