Illinois Water Assets
MidwestIllinois draws from deep sandstone aquifers, glacial drift aquifers, and the extensive alluvial aquifers along the Illinois and Mississippi rivers.
Illinois Water Intelligence Report
Hi3 Water tracks 121,392 water assets across Illinois, spanning 100 counties and 7 distinct asset types. The average Water Intelligence Score (WIS) across Illinois is 54.5/100, with 2 assets scoring in the high-value range (75+). Illinois operates under Reasonable Use water law, which directly affects water rights acquisition and asset valuation in this state.
The dominant water asset type in Illinois is Well (67,078 assets, avg WIS 47.4). The highest concentration is in Cook County with 1,329 tracked assets.
2,448 active regulatory alerts are currently tracked in Illinois, including EPA violations, drought declarations, and state water board enforcement actions. Always check the regulatory intelligence for any asset before making acquisition decisions.
Data sources: USGS Water Data, EPA ECHO, state water boards, and verified field reports. Water Intelligence Scores are computed across flow rate, geological stability, legal accessibility, sustainability, and rarity. Report last updated: October 16, 2026.
Asset Types in Illinois
Intelligence Grade Distribution
How Illinois assets are graded
Regulatory Alerts
Drought, EPA violations, and enforcement actions affecting Illinois
Top Counties in Illinois
Aquifer Type Mix
Top 10 Water Assets in Illinois
Ranked by Water Intelligence Score — Illinois's highest-scoring springs, wells, and aquifers.
- 1
Mahomet Aquifer — Central Illinois
AquiferChampaign County·1,000 GPM79WIS - 2
Cambrian-Ordovician Fossil Aquifer — Northern Illinois
Fossil WaterKane County·300 GPM77WIS - 3
Duck Creek Station Dams
Reservoir·1,229,797 GPM67WIS - 4
Shelbyville Dam
Reservoir·50,000,000 GPM67WIS - 5
American Coal/Galatia/Bunkhouse Rdf Dam
Reservoir·7,181 GPM67WIS - 6
Coffeen Gmf Gypsum Stack Dam
Reservoir·493,714 GPM67WIS - 7
Camp Saukenauk Lake Dam
Reservoir·493,714 GPM66WIS - 8
Lake In The Hills Dam 1
Reservoir·6,283,634 GPM66WIS - 9
Holiday Lake Dam
Reservoir·13,725,252 GPM66WIS - 10
Condit Dam 1
Reservoir·44,883 GPM66WIS
Explore Illinois on the Interactive Map
View all 121,392 water assets, aquifer boundaries, water rights data, and regulatory alerts for Illinois.