CHICAGO (Standard&Poor's) Oct. 21, 2011--Standard&Poor's Ratings Services has assigned its 'A' long-term rating to Philadelphia, Pa.'s $168.565 million series 2011A and 2011B water and wastewater revenue and refunding bonds. The outlook is stable. Standard&Poor' also affirmed its 'A' long-term rating and underlying rating (SPUR) on the city's existing water and wastewater revenue debt; its 'AAA/A-1' rating on the city's series 2005B bonds, which are jointly secured by the city and the letter of credit (LOC) provider Bank of America N.A. (A+/Negative/A-1); and its 'AAA/A-1+' rating on the city's series 1997B bonds, which are jointly secured by the city and the LOC provider TD Bank N.A. (AA-/Stable/A-1+). The outlook on the ratings is stable, except