The 'AAA' rating on Naperville, Ill.'s waterworks and sewerage revenue refunding bonds reflects the system's: Very strong financial operations with high levels of coverage and liquidity, Very high wealth and income levels, Competitive rates, Strong legal provisions, and Low debt burden with modest future debt needs. Net revenues of Naperville's combined waterworks and sewerage system secure the bonds. Naperville ('AAA' GO debt rating), in DuPage County, about 30 miles west of Chicago, Ill., is a rapidly growing community with a strong corporate presence. The city purchases water from the DuPage Water Commission, which, in turn, buys Lake Michigan water from Chicago. The city treats its own wastewater at the city-owned Springbrook Water Reclamation Center plant, which has a capacity of
