Geological Survey of Illinois

The Geological Survey of Illinois is a government agency dedicated to studying the state's geology, minerals, water resources, and natural hazards. Its work includes mapping underground and surface geology, investigating groundwater quality, and assessing mineral deposits. This research helps support responsible resource management, environmental protection, and informed decision-making for land use, development, and safety. By providing scientific data and expertise, the survey plays a key role in understanding Illinois’ physical environment and guiding sustainable development.