A Look at Federal Health Data Taken Offline | KFF

"On Friday January 31, 2025, several federal government datasets went offline. The datasets taken down included some widely used, large-scale national health surveys, indices, and data dashboards that inform research, policy making, and media coverage about health care and public health. For example, several Centers for Disease Control and Prevention (CDC) surveys and datasets were offline Friday and Saturday, with messages simply saying the page “was not found.” The homepage of the United States Census displayed an error message, but data.census.gov – where many datasets can be downloaded – was functioning.

By Sunday February 2, 2025, some of the landing pages started to come back online – now with a warning message: “CDC’s website is being modified to comply with President Trump’s Executive Orders,” suggesting there could be future changes. In some cases, survey data files are back online and appear to be intact, but the survey documentation (questionnaires and codebooks), which researchers use to analyze the data files, remained offline. Some related reports also remained offline. It is not yet clear whether all the datasets and their documentation that went offline will come back or remain online, and if they do, what changes, if any, will be made. It also remains to be seen what changes may be made to future data collection efforts...."