DALLAS (Standard&Poor's) Sept. 6, 2013--Standard&Poor's Ratings Services raised its rating on Trinity River Authority, Texas' water project revenue bonds, issued for Tarrant County's water project, one notch to 'AA+' from 'AA'. The outlook is stable. The upgrade reflects Standard&Poor's assessment of the improved credit quality of the retail utility systems participating in the authority's Tarrant County water project, evidenced by their strong debt service coverage and liquidity. At the same time, the rating service assigned its 'AA+' rating and stable outlook to the authority's $5.425 million series 2013 improvement revenue bonds, issued for Tarrant County's water project. "We believe project participants will likely continue to make regular, timely, and full payments to the authority.