S&P Global Ratings has assigned its 'AAA' long-term rating to Denver City&County, Colo.'s series 2018 wastewater enterprise revenue bonds. At the same time, S&P Global Ratings affirmed its 'AAA' rating on the system's existing revenue bonds. The outlook is stable. The rating reflects our opinion of the combination of the system's extremely strong enterprise and financial risk profiles. The extremely strong enterprise risk profile reflects our view of the system's: Role as the service provider to the anchor and namesake city in the broad and diverse Denver-Aurora-Lakewood metropolitan statistical area (MSA), which we consider economically strong; Very low industry risk as a monopolistic service provider of an essential public utility; Demonstrated ability and willingness to increase rates, given