DALLAS — The Tomball Independent School District is bringing $53.4 million of unlimited-tax school building bonds to market this week, following an upgrade of its underlying credit to AA-minus from A-plus by Standard & Poor’s.

Fitch Ratings already rates the district at AA-minus and Moody’s Investors Service rates the credit A1. Upgrades indicate the credit quality of an issuer is improving, often lead to lower costs of borrowing for future debt issuance, and may negate the need for bond insurance due to the underlying strength of the credit.

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