40 U.S.C. § 15734
The region of the Great Lakes Authority shall consist of areas in the watershed of the Great Lakes and the Great Lakes System (as such terms are defined in section 118(a)(3) of the Federal Water Pollution Control Act (33 U.S.C. 1268(a)(3))), in each of the following States:
(Added Pub. L. 117–328, div. O, title IV, § 401(b)(1), , 136 Stat. 5228.)