(WUSA9) -- Fairfax County continues to maintain a sterling Triple A Bond Rating from three major bond ratings firms, Moody's, Standard & Poor's and Fitch Ratings. But the county is firing back after Moody's warned investors that trouble could lie ahead.

Moody's assigned a negative outlook to the County's bond rating as part of an assessment ahead of a $305 million bond sale next week. The firm is citing concerns about the slow economy and impact of federal government budget decisions.

In a press release, Fairfax County Office of Public Affairs writes that Moody's assessment "ignores the County's strong fiscal management and the strength of its tax base." Fairfax County does not expect the outlook to impact its bond sale.