H.R. 900 — Sinkhole Mapping Act of 2025

This section directs the Director of the U.S. Geological Survey (USGS), subject to appropriations, to establish a program to (1) study short-term and long-term mechanisms causing sinkholes, including extreme storm events, prolonged droughts, aquifer depletion, and other changes in water use; and (2) develop maps depicting zones at greater risk of sinkhole formation using 3D elevation data collected under the National Landslide Preparedness Act (43 U.S.C. 3104). The section further requires the USGS Director to review and update the maps at least once every five years, or more often as needed, and to maintain a public website displaying the maps and other relevant information for community planners and emergency managers.