...S&P Global Ratings assigned its '###' rating to Trinity River Authority, Texas' series 2017 revenue refunding bonds, issued for its Central Regional Wastewater System (CRWS). We are also affirming our '###' rating on TRA's outstanding CRWS revenue bonds, as well as our 'A-1+' rating on the authority's series A $350 million extendible commercial paper (CP) program. Because it is an extendible maturity CP program with no revolving credit agreement or other liquidity support, the rating is based on the '###' long-term rating. We have applied the primary wholesale utility criteria to determine TRA's general creditworthiness (issuer credit rating) and have applied this rating to the senior-lien issues. The outlook on the long-term rating is stable. The CRWS system has a predominantly locally derived revenue base. Local service charges, derived through an autonomous rate-setting process, represent virtually all of the system's revenues. This, coupled with operating expense flexibility, limits...