(70 ILCS 1815/24) (from Ch. 19, par. 824)

Sec. 24.

Before the issuance of any bonds or certificates as herein provided, the
Board shall fix and establish rates, charges and fees for the use of
facilities acquired, constructed, reconstructed, extended or improved with
the proceeds derived from the sale of such bonds, sufficient at all times
with all other revenues of the District, to pay: (a) the cost of
maintaining, repairing, regulating and operation of the facilities; and (b)
the bonds or certificates and interest thereon as they shall become due;
and (c) all sinking fund and other requirements provided by the ordinance
authorizing the issuance of the bonds or certificates or as provided by any
trust agreement executed to secure payment thereof.

(Source: P.A. 77-1799.)