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Cost by State

Well Drilling Cost in Illinois

Illinois has two primary aquifer systems — shallow glacial drift aquifers across much of the state, and deep Cambrian-Ordovician sandstone aquifers used in northern Illinois. Costs and depths vary accordingly.

Average Total Cost
$6,000 – $15,000
Cost Per Foot
$20 – $50
Average Depth
100 – 400 ft
Regulator
Illinois EPA
Illinois Well Types
Shallow drift wells (most of central and southern IL): 60–150 feet in glacial sand and gravel, $20–$35/ft. Deep sandstone aquifer wells (Chicago suburbs, northern IL): 400–1,200 feet in the Cambrian-Ordovician sandstone, $35–$55/ft — these are expensive due to depth. East-central IL dolomite: 100–300 feet, moderate cost.
Illinois Regulations
Illinois water well construction is regulated by Illinois EPA and the Illinois Department of Public Health. Licensed water well contractors required. Permit required before construction. Completion report must be filed.
Common Questions
Shallow drift wells in rural central Illinois cost $6,000–$11,000 installed. Deep sandstone wells in the Chicago suburbs can cost $20,000–$40,000+ due to extreme depth requirements.
The shallow aquifers in northeastern Illinois are often contaminated or inadequate for residential use. The Cambrian-Ordovician sandstone aquifer at 400–1,200 feet provides clean, reliable water but requires expensive deep drilling.
Related Topics
Cost by State
Well Drilling Cost in Indiana
Cost by State
Well Drilling Cost in Ohio
Technical Reference
Water Well Casing Size Guide
Important: Well drilling costs, depths, and regulations vary significantly within each state. This page provides general reference information only. Always get quotes from multiple licensed well contractors in your area and verify current state regulations before proceeding.