Standard & Poor's Ratings Services said it raised its rating to AA from AA-minus on Skyway Water and Sewer District, Wash.'s water and sewer revenue bonds.

The outlook is stable.

"The upgrade is based on our view of the district's consistently strong financial performance during the last three years," said Standard & Poor's credit analyst Mary Ellen Wriedt.

The district has $5.6 million in outstanding bonds.

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