Moody's Investors Service last week assigned an A1 rating to a $28.7 million Mello-Roos community facilities district bond issue, the highest rating ever given by the rating agency for such debt.

The special tax bond issue will be sold today by the Mount Diablo Unified School District, located about 30 miles northeast of San Francisco. Moody's also rates the district's outstanding general obligation debt A1.

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