(1) The water pollution control revolving fund is hereby established in the state treasury. Moneys in this fund may be spent only after legislative appropriation. Moneys in the fund may be spent only in a manner consistent with this chapter.
(2) The water pollution control revolving fund shall consist of:
(a) All capitalization grants provided by the federal government under the clean water act;
(b) All state matching funds appropriated or authorized by the legislature;
(c) Any other revenues derived from gifts or bequests pledged to the state for the purpose of providing financial assistance for water pollution control projects;
(d) All repayments of moneys borrowed from the fund;
(e) All interest payments made by borrowers from the fund;
(f) Any other fee or charge levied in conjunction with administration of the fund; and
(g) Any new funds as a result of leveraging.
(3) The state treasurer may invest and reinvest moneys in the water pollution control revolving fund in the manner provided by law. All earnings from such investment and reinvestment shall be credited to the water pollution control revolving fund.