S&P Global Ratings revised the outlook to negative from stable on the City of Houston ?s combined utility system?s (CUS) revenue bond rating outstanding. We have also assigned our ?A-1+? short-term rating to the city?s $500 million series B-8 extendable commercial paper (ECP). At the same time, S&P Global Ratings affirmed its 'AA' rating on the system's first-lien revenue bonds outstanding and its 'AA+' rating on the system's previous ordinance bonds. We also affirmed our 'A-1+' short-term rating on the utility system's existing commercial paper (CP) notes and our ?AAA/A-1+? rating on the CUS? series 2004B-5 variable-rate bonds. The outlook revision reflects the utility?s recent absorption of Houston?s solid waste fund absent sufficient dedicated charges, and the adoption of a