Geologic Records Unit

Hours: Monday - Friday, 8:00 a.m.- 4:30 p.m.
Location: 1816 S. Oak, Champaign, IL
Mailing address: Geological Records Unit, Illinois State Geological Survey, 615 E. Peabody, Champaign, IL 61820
Phone: 217-333-5109
Fax: 217-244-0802

The Geological Records Unit (GRU) is the state repository for drilling records as mandated by statute. The collections include records for more than 500,000 oil and gas wells, water wells, engineering borings, and miscellaneous test holes drilled in Illinois. Many regions of the state lack abundant outcrops and road and stream cuts due to relatively flat topography. Drill hole records provide the most abundant data available for geologic interpretation. These data are useful for environmental assessment, mineral resource evaluation and groundwater resource evaluation and protection. GRU is the gateway to Illinois geology.

Collections
Services

Online Well Data

ILWATER
ILOIL

Ordering Information

Well Location (Questor) Maps
Well Log Copying Services