Illinois water well logs, made useful.
Every water well log the Illinois State Geological Survey holds — depth, the driller who filed it, and the original record — brought together around one address, instead of one record at a time.
✓ Verified against ISGS · 2026-09-28
140 ftmedian well depth statewide
15 gpmmedian well yield
13,176wells drilled since 2016
317,885wells you can look up by location
From recent buyers
“Between the report and your correspondence I feel I got way more than my money's worth… it has even removed a ton of stress.”
“Thank you, fantastic and good information. Worth far more than what I paid — your time especially!”
“The report was very helpful and answered my questions.”
What you can answer here
- How deep will my well need to be? Median and range of actual drilled depths near you — not national averages.
- What will it cost? Local median depth × published per-foot rates, with the math shown.
- Will it produce enough water? Yields from pump tests on nearby wells.
- Who drills around here? The drillers who actually filed recent well logs in your county.
These are ISGS records
Every figure here comes from the Illinois State Geological Survey water well records — the state's official well-log repository. We index those same records by location so you can start from an address, and every well links back to its original filed log.
Buying property with a well — or land you'd need to drill?
See every recorded well near any Illinois address: well depths, the drilling contractor who filed each log, owner names, reported pump rates where the driller recorded one, and a link to the survey's own record page for each well — all in one report.
Get the property report — $49Driller, agent, or inspector? Unlimited & white-label plans →
Well data by county
Adams County 1,529 wells · median 180 ft Alexander County 425 wells · median 115 ft Bond County 1,641 wells · median 38 ft Boone County 4,750 wells · median 165 ft Brown County 152 wells · median 195 ft Bureau County 3,153 wells · median 200 ft Calhoun County 336 wells · median 107 ft Carroll County 1,902 wells · median 240 ft Cass County 930 wells · median 67 ft Champaign County 5,388 wells · median 135 ft Christian County 2,038 wells · median 41 ft Clark County 1,151 wells · median 65 ft Clay County 1,260 wells · median 91 ft Clinton County 2,412 wells · median 38 ft Coles County 1,540 wells · median 65 ft Cook County 11,688 wells · median 200 ft Crawford County 1,190 wells · median 63 ft Cumberland County 1,086 wells · median 40 ft Dekalb County 3,554 wells · median 202 ft Dewitt County 1,368 wells · median 151 ft Douglas County 1,268 wells · median 81 ft Dupage County 10,728 wells · median 161 ft Edgar County 1,162 wells · median 66 ft Edwards County 221 wells · median 80 ft Effingham County 2,812 wells · median 46 ft Fayette County 2,761 wells · median 41 ft Ford County 1,202 wells · median 130 ft Franklin County 282 wells · median 120 ft Fulton County 1,356 wells · median 76 ft Gallatin County 612 wells · median 90 ft Greene County 685 wells · median 64 ft Grundy County 3,475 wells · median 168 ft Hamilton County 166 wells · median 298 ft Hancock County 940 wells · median 225 ft Hardin County 444 wells · median 202 ft Henderson County 921 wells · median 117 ft Henry County 2,795 wells · median 275 ft Iroquois County 2,461 wells · median 140 ft Jackson County 1,451 wells · median 180 ft Jasper County 1,155 wells · median 40 ft Jefferson County 650 wells · median 70 ft Jersey County 1,140 wells · median 84 ft Jo Daviess County 2,994 wells · median 220 ft Johnson County 484 wells · median 192 ft Kane County 12,583 wells · median 230 ft Kankakee County 7,166 wells · median 120 ft Kendall County 5,011 wells · median 235 ft Knox County 1,864 wells · median 180 ft Lake County 26,135 wells · median 154 ft Lasalle County 7,286 wells · median 165 ft Lawrence County 1,311 wells · median 99 ft Lee County 3,896 wells · median 190 ft Livingston County 2,452 wells · median 100 ft Logan County 1,850 wells · median 65 ft Macon County 2,394 wells · median 90 ft Macoupin County 1,521 wells · median 41 ft Madison County 5,655 wells · median 46 ft Marion County 1,388 wells · median 50 ft Marshall County 944 wells · median 106 ft Mason County 3,201 wells · median 98 ft Massac County 1,056 wells · median 111 ft Mcdonough County 1,321 wells · median 220 ft Mchenry County 23,076 wells · median 126 ft Mclean County 3,604 wells · median 145 ft Menard County 1,068 wells · median 48 ft Mercer County 1,733 wells · median 395 ft Monroe County 2,950 wells · median 210 ft Montgomery County 2,022 wells · median 40 ft Morgan County 1,311 wells · median 42 ft Moultrie County 1,048 wells · median 87 ft Ogle County 6,260 wells · median 200 ft Peoria County 5,540 wells · median 70 ft Perry County 618 wells · median 46 ft Piatt County 1,638 wells · median 140 ft Pike County 976 wells · median 115 ft Pope County 420 wells · median 185 ft Pulaski County 716 wells · median 80 ft Putnam County 833 wells · median 162 ft Randolph County 2,427 wells · median 78 ft Richland County 1,708 wells · median 180 ft Rock Island County 4,244 wells · median 220 ft Saline County 475 wells · median 140 ft Sangamon County 4,246 wells · median 40 ft Schuyler County 429 wells · median 100 ft Scott County 354 wells · median 65 ft Shelby County 2,866 wells · median 44 ft St. Clair County 5,512 wells · median 78 ft Stark County 535 wells · median 116 ft Stephenson County 3,376 wells · median 184 ft Tazewell County 5,164 wells · median 118 ft Union County 1,776 wells · median 250 ft Vermilion County 4,689 wells · median 95 ft Wabash County 815 wells · median 210 ft Warren County 1,835 wells · median 185 ft Washington County 895 wells · median 70 ft Wayne County 1,362 wells · median 120 ft White County 1,209 wells · median 91 ft Whiteside County 4,653 wells · median 120 ft Will County 22,808 wells · median 165 ft Williamson County 505 wells · median 160 ft Winnebago County 12,105 wells · median 135 ft Woodford County 3,407 wells · median 142 ft