Before 1999, few children in Florida's Miami-Dade County were being screened for lead poisoning. To improve screening rates, the county's department of health developed screening recommendations and a screening tool using surveillance and census data and disseminated these materials to primary care providers. Each year, recommendations have been reviewed to assess their sensitivity, and revised recommendations have been disseminated to health care providers. The percentage of children 6 years or younger screened in Florida who reside in Miami-Dade County increased from 4.1% in 1998 to 20.3% in 2002. Analysis and dissemination of blood lead surveillance data not only guide development of screening recommendations but also educate health care providers regarding the importance of childhood screening.