DuPage County’s waterworks and sewage revenue bond program won an upgrade to AA-plus from AA thanks to the strength of debt service coverage ratios that are expected to remain steady following a rate increase.

The review of the credit was conducted in conjunction with the county’s new-money and refunding sale of $15 million of waterworks and sewage project first- and second-lien bonds. Standard & Poor’s upgraded the first-lien and second-lien credits to AA-plus while Fitch Ratings upgraded just the first lien to AA-plus. The junior lien is rated AA by Fitch.

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