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How Deep Are Wells in Tennessee? Real Depth Data by County

"How deep will my well need to be?" is one of the hardest well-drilling questions to answer in the abstract, because it depends entirely on local geology. Tennessee publishes its driller's completion reports as open data, so instead of a national average, here is what 30,465 actual residential wells drilled since 2011 report for depth, broken down by county.

Source and method: Tennessee Department of Environment & Conservation Water Wells dataset from the Well Log Tracking System (TDEC Division of Water Resources), extracted 2026-07-14. Figures include only wells recorded as residential (domestic) use, completed 2011 or later, with a reported depth between 15 and 2,000 ft (to exclude likely data-entry errors). A county is shown only if it has at least 5 qualifying reports. The depth shown is the reported total completed depth of the well; these driller-submitted reports are not independently verified by TDEC, which also documents known locational and records caveats in the dataset. These are figures self-reported by licensed drillers to the state; neither the Tennessee Department of Environment & Conservation nor this site independently verifies them. Treat this as a planning reference, not a guarantee for any specific property, your own site could sit well outside your county's typical range.

Median well depth by county

"Typical range" is the 10th-to-90th-percentile band, i.e. where 80% of reported wells in that county fell. Counties with fewer than 5 qualifying reports since 2011 are omitted rather than shown with a misleading precise figure.

County Median depth Typical range (10th-90th pct) Reports used
Anderson 340 ft 147-605 ft 60
Bedford 223 ft 120-1000 ft 139
Benton 109 ft 53-220 ft 377
Bledsoe 242 ft 124-482 ft 476
Blount 320 ft 160-671 ft 609
Bradley 285 ft 145-487 ft 281
Campbell 243 ft 125-585 ft 120
Cannon 140 ft 70-400 ft 281
Carroll 135 ft 88-180 ft 502
Carter 305 ft 145-605 ft 320
Cheatham 220 ft 125-300 ft 195
Chester 130 ft 75-170 ft 509
Claiborne 305 ft 125-600 ft 425
Clay 150 ft 100-240 ft 23
Cocke 310 ft 145-605 ft 741
Coffee 100 ft 60-240 ft 150
Crockett 175 ft 115-242 ft 133
Cumberland 240 ft 125-400 ft 303
Davidson 270 ft 140-400 ft 120
Decatur 204 ft 87-425 ft 88
DeKalb 155 ft 75-300 ft 113
Dickson 200 ft 100-320 ft 261
Dyer 140 ft 70-260 ft 58
Fayette 165 ft 130-205 ft 1,411
Fentress 200 ft 120-382 ft 239
Franklin 188 ft 80-298 ft 153
Gibson 150 ft 100-255 ft 371
Giles 205 ft 100-408 ft 207
Grainger 320 ft 160-590 ft 659
Greene 325 ft 150-605 ft 237
Grundy 122 ft 75-275 ft 234
Hamblen 335 ft 185-620 ft 76
Hamilton 300 ft 160-600 ft 215
Hancock 265 ft 120-505 ft 346
Hardeman 160 ft 95-310 ft 430
Hardin 189 ft 82-442 ft 224
Hawkins 260 ft 125-505 ft 669
Haywood 160 ft 100-220 ft 173
Henderson 140 ft 90-220 ft 169
Henry 130 ft 80-190 ft 494
Hickman 200 ft 85-325 ft 488
Houston 211 ft 110-385 ft 110
Humphreys 200 ft 85-380 ft 902
Jackson 155 ft 75-400 ft 98
Jefferson 345 ft 185-610 ft 706
Johnson 345 ft 165-605 ft 415
Knox 300 ft 160-605 ft 443
Lake 85 ft 70-100 ft 5
Lauderdale 116 ft 60-195 ft 34
Lawrence 133 ft 75-305 ft 729
Lewis 173 ft 100-308 ft 477
Lincoln 100 ft 58-360 ft 133
Loudon 380 ft 160-680 ft 285
Macon 125 ft 70-200 ft 104
Madison 147 ft 94-200 ft 441
Marion 200 ft 100-505 ft 377
Marshall 200 ft 100-400 ft 425
Maury 297 ft 130-1000 ft 365
McMinn 265 ft 145-525 ft 717
McNairy 130 ft 80-300 ft 219
Meigs 341 ft 158-600 ft 212
Monroe 305 ft 165-580 ft 849
Montgomery 300 ft 126-420 ft 60
Moore 191 ft 75-297 ft 18
Morgan 260 ft 150-445 ft 149
Obion 140 ft 75-220 ft 72
Overton 200 ft 80-402 ft 126
Perry 189 ft 100-350 ft 241
Pickett 200 ft 100-235 ft 5
Polk 273 ft 153-525 ft 385
Putnam 146 ft 80-320 ft 93
Rhea 305 ft 143-580 ft 153
Roane 360 ft 180-590 ft 167
Robertson 160 ft 80-300 ft 135
Rutherford 250 ft 120-500 ft 278
Scott 250 ft 160-600 ft 31
Sequatchie 282 ft 102-520 ft 289
Sevier 410 ft 185-810 ft 2,685
Shelby 200 ft 120-280 ft 83
Smith 196 ft 70-300 ft 52
Stewart 240 ft 105-420 ft 522
Sullivan 405 ft 205-705 ft 128
Sumner 150 ft 70-280 ft 257
Tipton 110 ft 70-220 ft 186
Trousdale 200 ft 120-300 ft 21
Unicoi 265 ft 125-505 ft 115
Union 325 ft 160-605 ft 426
Van Buren 224 ft 123-342 ft 329
Warren 100 ft 62-180 ft 94
Washington 405 ft 220-705 ft 288
Wayne 179 ft 100-310 ft 581
Weakley 150 ft 100-225 ft 345
White 142 ft 82-400 ft 90
Williamson 205 ft 125-400 ft 749
Wilson 200 ft 100-350 ft 187

How to use this table

Find your county, then use the median and typical-range figures as a starting point when budgeting with the well drilling cost estimator or reading the cost guide. A driller working in your county day-to-day will still know more about your specific property than a county-wide figure can, ask them how your site compares to the county's typical range, and why, before you commit to a per-foot quote with no depth ceiling.

We build these tables state by state from each state's public completion-report data. See also our Texas well depth by county page.

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