OREANDA-NEWS. Fitch Ratings will downgrade the short-term rating assigned to the City of Houston, Texas Combined Utility System Commercial Paper Notes, $100,000,000 series B-6 to 'F1' from 'F1+' and affirm the 'F1+' rating assigned to $100,000,000 series B-4. The rating actions are in connection with the substitution of the current Revolving Credit Agreement (RCA) provided by U.S. Bank, NA ('AA/F1+'/Stable Outlook) with a RCA to be provided by Bank of America, NA ('A+/F1'/Stable Outlook) for series B-6, and the substitution of the current letter of credit (LOC) provided by State Street Bank and Trust Company ('AA/F1+'/Stable Outlook) with a RCA to be provided by State Street for series B-4.