In the title compound, [Ni(C(9)H(7)O(2))(C(16)H(36)N(4))]ClO(4)·H(2)O, the macrocyclic 5,5,7,12,12,14-hexa-methyl-1,4,8,11-tetra-aza-cyclo-tetra-decane ligand (L) folds around the Ni(II) atom, which is also chelated by the carboxyl-ate group. The geometry is a distorted N(4)O(2) octa-hedron. In the crystal, adjacent mol-ecules are connected by O-H⋯O and N-H⋯O hydrogen bonds into a zigzag chain parallel to [010].