AUSTIN, Texas--(BUSINESS WIRE)--Fitch Ratings affirms its 'AA-' rating to North Texas Municipal Water District's (the district) regional solid waste disposal system (the system) revenue bonds as follows: --$5.4 million solid waste disposal system revenue bonds, series 2006; --$17.5 million solid waste disposal system revenue bonds, series 2009. The Rating Outlook is Stable. SECURITY The bonds are secured by a first lien on gross revenues of the system, primarily derived from the annual required