NEW YORK (Standard&Poor's CreditWire) Aug. 3, 1999-- Standard&Poor's today assigned its single-'A'-minus rating to Puyallup, Wash.'s $4.5 million water and sewer revenue bonds series 1999 dated Aug. 1, 1999, due July 1, 2019. The bonds are scheduled to sell Aug. 12, 1999. At the same time, Standard&Poor's affirmed its single-'A'-minus underlying rating (SPUR) on the city's water and sewer revenue bonds series 1998. The rating on Puyallup's water and sewer revenue bonds reflects the following credit strengths: -- Good financial performance, -- A stable and diverse local economy with access to the greater Seattle-Tacoma region, and -- Continued progress on the utility system's capital plan. These strengths are offset by high rates. Puyallup (GO