SAN FRANCISCO — Citing the recession’s impact on tax revenue, Moody’s Investors Service on New Year’s Eve revised its outlook to negative from stable on Washington’s Aa1 general obligation bond rating.

The action affects about $15 billion of outstanding GO bonds, as well as a new $488 million issue the state plans to sell competitively Jan. 13. Moody’s also revised the outlook to negative on about $806 million in Aa2-rated certificates of participation, as well as on a $132 million COP deal planned later in January.

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