Standard&Poor's Ratings Services assigned its 'A-1+' rating to Trinity River Authority (TRA), Texas' series A tax-exempt and taxable series A commercial paper (CP) program. Because it is an extendible maturity CP program with no revolving credit agreement or other liquidity support, the ratings are based on the long-term debt rating of 'AAA' on TRA, which we are affirming. In addition, we assigned our 'AAA' long-term rating to TRA's series 2014 revenue refunding bonds, issued for its Central Regional Wastewater Treatment System (CRW). The outlook is stable. The long-term rating reflects our assessment of the general creditworthiness of the cities participating in CRW, with common characteristics that include: Financial margins that generate strong coverage of all on-balance-sheet and off-balance-sheet