Standard&Poor's Ratings Services raised its underlying rating (SPUR) to 'AA-' from 'A+' on Tacoma, Wash.'s series 2001 solid waste revenue bonds. Additionally, Standard&Poor's assigned its 'AA-' long-term rating to the city's series 2006 solid waste revenue and refunding bonds. The new rating affects $32.915 million in outstanding debt. The raised rating reflects the strong conservative management policies, providing solid liquidity and debt service coverage, and a competitive position into the future. Additional rating factors include: A sound and diverse local service area economy; A strong revenue collection process; Diverse customer base; Sound financial operations; and Limited future capital needs. These strengths are slightly mitigated by: Above-average fees; however, there is a strong collection process as charges