Similar to the United States, Canada's overarching challenge is to build a core public health infrastructure for the 21st century. Assessing the informational reputation of Web-based providers demonstrates the centrality of federal government departments and agencies in the Canadian public health infostructure. The federal government's substantial investment in government online projects has helped bring public health information and services to Canadians, and continuing to build on that infostructure will be critical to revitalizing public health in the future.