Groundwater-Level Altitudes and Long-Term Groundwater-Level Changes in the Chicot and Evangeline (undifferentiated) and Jasper aquifers, greater Houston area, Texas, 2024

The U.S. Geological Survey (USGS) in cooperation with the Harris‐Galveston Subsidence District, City of Houston, Fort Bend Subsidence District, Lone Star Groundwater Conservation District, and Brazoria County Groundwater Conservation District produced this dataset of groundwater‐level altitudes and groundwater‐level altitude changes in the Chicot and Evangeline aquifers (undifferentiated), and Jasper aquifer in the greater Houston area, Texas. This dataset shows current‐year (2024) groundwater‐level altitudes for each aquifer as well as 1-year (2023–24), and 5‐year (2019–24) groundwater‐level changes for each aquifer, long‐term (1990–2024 and 1977–2024) groundwater‐level changes for the Chicot and Evangeline aquifers (undifferentiated), and long‐term (2000–2024) groundwater‐level changes for the Jasper aquifer. The groundwater‐level measurements from which the dataset was built are stored in the USGS National Water Information System (NWIS), a publicly available, searchable, online database of water information (USGS, 2024).

In 2024, measured groundwater-level-altitudes for the Chicot and Evangeline aquifers (undifferentiated) ranged from about 320 feet (ft) below to about 205 ft above the North American Vertical Datum of 1988 (NAVD 88). Measured groundwater-level-altitudes for the Jasper aquifer ranged from about 266 ft below datum to about 234 ft above NAVD 88.