Moody’s Investors Service downgraded Groton, Conn.’s long-term general obligation rating to Aa3 from Aa2 and affirmed a negative outlook.

The move affects $41.5 million of outstanding rated debt secured by the city’s unlimited-tax pledge.

Moody’s cited Groton’s continued exposure to the risk of Thames Valley Communication Inc., the city’s wholly owned telecom corporation, for which it has about $28.6 million of GOs outstanding, including bond anticipation notes.

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