Mo. Rev. Stat. § 644.526: Investment of water pollution control funds — interest to accrue to fund.

The state treasurer, with the approval of the board of fund commissioners, is authorized to invest all of the moneys credited to the water pollution control fund as he, in the exercise of his best judgment, determines to be in the best overall interest of the people of the state of Missouri. Any interest received on such deposits shall be credited to the water pollution control fund.