The title compound, [Cu(C(2)H(3)N)(2)(C(10)H(24)N(4))](C(32)H(12)BF(24))(2).0.31H(2)O, crystallizes as an ionic species with no interactions between the ions. The [Cu(II)(cyclam)(MeCN)(2)](2+) dication (cyclam is 1,4,8,11-tetraazatetradecane), located on a 2/m symmetry site, forms as a distorted octahedral species with four Cu-N(cyclam) bonds of 2.013 (2) A and two C-N(MeCN) bonds of 2.499 (4) A. The [B[C(6)H(3)(CF(3))-3,5](4)](-) anion, located on a twofold axis, is a distorted octahedral species. A small amount of water is present, occupying sites between columns of ions.