CHICAGO — Chicago enters the market with $270 million of second-lien wastewater revenue bonds Thursday in a deal to raise funds for the city’s ramped-up efforts to upgrade its aging sewer systems.

Though much of the news stemming from the city’s general credit has been negative, the enterprise system’s $1.3 billion of debt received a boost from a shift in outlook from Fitch Ratings to positive from stable due to improving debt-service coverage ratios following rate hikes.

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