DALLAS (Standard&Poor's) March 11, 2003--Standard&Poor's Ratings Services raised its standard long-term and underlying ratings on Cedar Hill, Texas' general obligation debt outstanding to 'A+' based on the city's sustained property tax base growth and diversification. Standard&Poor's also raised its underlying rating on Cedar Hill's water and sewer system revenue bonds outstanding to 'A-' based on improved debt service coverage and system liquidity and the implementation of a plan to adequately fund an escalating liability to the U.S. Army Corps of Engineers for the Joe Pool Lake project. The rating agency also assigned its 'A+' rating and stable outlook to the city's $2.3 million series 2003 general obligation refunding bonds and $3.0 million series 2003