S&P Global Ratings affirmed its 'A-1+' short-term rating on the water system of San Antonio, Texas' (San Antonio Water System, or SAWS) series A-1 and series B commercial paper (CP) notes to reflect the substitution of a new liquidity provider supporting series B. SAWS' CP program is used for interim financing. We base the CP ratings on our 'AA+' long-term ratings on SAWS' junior-lien bonds using our "Methodology For Linking Long-Term And Short-Term Ratings", published April 7, 2017, on RatingsDirect. SAWS currently maintains $101.8 million in debt outstanding on the senior lien and $3.02 billion on the junior lien (working lien) in addition to CP, which is subordinate to the junior lien. We consider both senior and junior lien bond