Standard&Poor's Ratings Services assigned its 'AA-' rating, and stable outlook, to Williamson County, Texas' series 2006 unlimited-tax GO road bonds and series 2006 combination tax and revenue certificates of obligation. The rating reflects the county's: Sustained economic diversification and expansion, Successful management of growth-related pressures, and Consistently strong financial management and performance. Constraining the rating from being raised at this time is the county's: High, and still increasing, overall net debt levels; and Significant infrastructure needs to meet ongoing growth pressures in the future. The county's full faith and credit pledge secures the bonds and certificates. Williamson County has experienced explosive population and property tax base growth over the past five years due to its access to Austin,
