In McMullen County, home wells run from 130 to 2,806 feet

In some Texas counties the neighbor's well says little about yours. In McMullen County, 8 of every 10 home wells fall between 130 and 2,806 feet, a spread of 2,676 feet (54 wells, since 2001). 5 of the 245 counties with at least 30 wells have a spread of 1,000 feet or more. At the other end, in Knox County the same 8 of 10 wells sit between 42 and 61 feet.

Updated every day from Texas Water Development Board driller reports. Last update: November 11, 2026, using the state file of November 10, 2026.

Download the table (CSV)Sources and how to check it

The figures

Widest spread: McMullen: 2,676 feet; 130 to 2,806 feet
Counties with 1,000 feet or more: 5 of 245
Narrowest spread: Knox: 19 feet; 42 to 61 feet
All of Texas: 116 to 521 feet; 8 of 10 wells

The spread in every county

8 of every 10 home wells fall between the two ends (10th and 90th percentile). Tap a heading to sort.

County	Shallow end (ft)	Median (ft)	Deep end (ft)	Spread (ft)	Deep end ÷ shallow end	Wells
McMullen	130	360	2,806	2,676	21.6×	54
La Salle	244	360	2,185	1,941	9.0×	57
Zavala	317	520	1,658	1,341	5.2×	39
McLennan	56	1,100	1,260	1,204	22.5×	88
Collin	420	1,020	1,561	1,141	3.7×	50
Ellis	76	420	916	840	12.1×	157
Culberson	150	407	966	816	6.4×	39
Bell	95	560	890	795	9.4×	517
Medina	220	535	970	750	4.4×	800
Bosque	180	480	880	700	4.9×	403
Uvalde	86	300	783	697	9.1×	403
Real	65	380	760	695	11.7×	244
Anderson	86	442	760	674	8.8×	264
Hudspeth	88	297	732	644	8.3×	44
Smith	82	430	718	636	8.8×	398
Bexar	240	500	870	630	3.6×	810
Jeff Davis	177	380	800	623	4.5×	88
Milam	78	422	690	612	8.8×	328
Henderson	90	460	700	610	7.8×	603
Wood	80	464	682	602	8.5×	265
Travis	220	445	820	600	3.7×	969
Dimmit	352	500	940	588	2.7×	63
Galveston	112	424	700	588	6.3×	988
Cherokee	117	433	700	583	6.0×	384
Terrell	326	716	905	579	2.8×	54
Brewster	196	363	772	576	3.9×	198
Webb	391	640	957	566	2.4×	92
Hopkins	164	444	724	560	4.4×	128
Kendall	200	413	760	560	3.8×	1,214
Williamson	300	553	830	530	2.8×	1,229
Val Verde	131	400	650	519	5.0×	155
Hays	350	510	850	500	2.4×	1,086
Nacogdoches	160	420	660	500	4.1×	268
Burleson	185	352	680	495	3.7×	648
Denton	300	440	780	480	2.6×	888
Kerr	267	540	740	473	2.8×	955
Roberts	174	470	640	466	3.7×	115
San Saba	67	285	525	458	7.8×	253
Hidalgo	84	320	540	456	6.4×	105
Kinney	64	140	520	456	8.1×	85
Leon	213	435	660	447	3.1×	364
Robertson	176	438	620	444	3.5×	372
Red River	44	90	485	441	11.0×	71
Johnson	200	400	640	440	3.2×	1,110
Somervell	260	460	700	440	2.7×	140
Lee	240	458	679	439	2.8×	284
Cooke	230	500	667	437	2.9×	639
Blanco	210	410	645	435	3.1×	1,172
El Paso	110	155	540	430	4.9×	51
Gray	160	450	586	426	3.7×	106
Hill	160	360	586	426	3.7×	357
Pecos	140	261	559	419	4.0×	92
Gillespie	125	240	540	415	4.3×	1,959
Grayson	190	340	605	415	3.2×	372
Burnet	146	350	560	414	3.8×	2,625
Karnes	200	400	608	408	3.0×	264
Brazoria	145	363	550	405	3.8×	3,487
Live Oak	120	250	525	405	4.4×	273
Carson	280	400	680	400	2.4×	81
Freestone	201	450	600	399	3.0×	252
Coryell	344	480	730	386	2.1×	276
Bandera	400	510	784	384	2.0×	1,042
Bastrop	180	328	560	380	3.1×	874
Limestone	150	360	521	371	3.5×	375
Reagan	230	380	600	370	2.6×	96
Dallas	32	55	400	368	12.5×	71
Houston	168	349	536	368	3.2×	278
Hutchinson	206	400	574	368	2.8×	33
Upshur	263	474	630	367	2.4×	224
Starr	160	460	522	362	3.3×	46
Comal	320	484	680	360	2.1×	1,255
Kimble	60	260	420	360	7.0×	505
Orange	147	405	500	353	3.4×	651
Guadalupe	46	255	397	351	8.6×	747
Hemphill	129	290	478	349	3.7×	36
Trinity	125	274	472	347	3.8×	136
Brazos	220	360	566	346	2.6×	235
Lipscomb	100	305	442	342	4.4×	100
Fayette	140	265	480	340	3.4×	1,233
Harrison	140	340	480	340	3.4×	404
Van Zandt	240	440	580	340	2.4×	935
Zapata	360	500	700	340	1.9×	51
Matagorda	211	410	550	339	2.6×	593
Franklin	204	418	542	338	2.7×	50
Hardin	121	255	459	338	3.8×	828
Marion	163	375	500	337	3.1×	80
Rusk	219	408	556	337	2.5×	370
Menard	92	252	425	333	4.6×	178
Mills	150	300	480	330	3.2×	221
Erath	135	375	464	329	3.4×	1,557
Gonzales	180	360	504	324	2.8×	518
Hood	159	360	480	321	3.0×	967
Walker	140	260	460	320	3.3×	716
Presidio	283	343	602	319	2.1×	60
Bowie	48	80	365	317	7.6×	356
McCulloch	100	205	417	317	4.2×	113
Jim Wells	228	378	542	314	2.4×	606
Crockett	275	410	580	305	2.1×	33
Mason	80	145	385	305	4.8×	551
Titus	259	441	560	301	2.2×	70
Atascosa	260	380	560	300	2.2×	573
Chambers	120	200	420	300	3.5×	329
Jim Hogg	300	360	600	300	2.0×	269
Lampasas	208	346	500	292	2.4×	399
Panola	78	220	370	292	4.7×	276
Angelina	86	186	377	291	4.4×	302
Madison	238	366	529	291	2.2×	372
Shelby	136	263	427	291	3.1×	176
Hamilton	321	475	610	289	1.9×	507
Rains	118	260	403	285	3.4×	63
Camp	300	492	584	284	1.9×	41
Reeves	118	260	401	283	3.4×	90
Eastland	60	115	342	282	5.7×	207
Refugio	140	220	420	280	3.0×	204
Young	120	210	400	280	3.3×	184
Upton	167	300	444	277	2.7×	59
Grimes	165	295	440	275	2.7×	1,117
Clay	100	200	374	274	3.7×	244
Archer	30	100	300	270	10.0×	55
Irion	80	160	345	265	4.3×	91
Hunt	120	216	384	264	3.2×	244
Tarrant	197	340	460	263	2.3×	1,714
Montague	120	220	380	260	3.2×	1,162
Palo Pinto	140	200	400	260	2.9×	847
Randall	260	344	520	260	2.0×	3,866
Frio	280	420	535	255	1.9×	251
Dickens	49	117	302	253	6.2×	107
Fannin	44	62	296	252	6.7×	207
Duval	280	360	531	251	1.9×	154
San Augustine	80	175	330	250	4.1×	194
Cass	280	370	526	246	1.9×	379
Wise	140	220	385	245	2.8×	3,603
Comanche	80	158	323	243	4.0×	538
Edwards	260	400	500	240	1.9×	445
San Jacinto	120	209	358	238	3.0×	721
Brooks	365	431	602	237	1.6×	34
Caldwell	185	260	420	235	2.3×	470
Navarro	60	107	294	234	4.9×	47
Borden	56	104	288	232	5.1×	44
Brown	100	198	331	231	3.3×	120
Lamb	122	223	352	230	2.9×	124
Washington	152	236	382	230	2.5×	1,775
Jasper	80	185	309	229	3.9×	794
Liberty	140	250	362	222	2.6×	921
Hansford	360	485	580	220	1.6×	46
Jack	120	220	340	220	2.8×	760
Moore	380	475	600	220	1.6×	177
Nueces	177	280	396	219	2.2×	289
Llano	84	170	300	216	3.6×	1,159
Kleberg	560	660	771	211	1.4×	33
Sutton	200	360	410	210	2.0×	127
Scurry	131	240	340	209	2.6×	128
Polk	120	205	328	208	2.7×	807
Morris	331	445	537	206	1.6×	75
Fort Bend	160	260	365	205	2.3×	2,013
Harris	150	260	355	205	2.4×	2,261
Schleicher	200	308	404	204	2.0×	92
Falls	55	65	258	203	4.7×	139
Terry	98	145	300	202	3.1×	453
Sabine	66	128	267	201	4.0×	114
Calhoun	130	225	330	200	2.5×	315
Concho	100	125	300	200	3.0×	107
Glasscock	140	265	340	200	2.4×	91
Ochiltree	360	420	560	200	1.6×	52
Parker	180	240	380	200	2.1×	7,270
Wharton	105	200	305	200	2.9×	1,079
Maverick	61	200	260	199	4.3×	72
Wilson	281	380	480	199	1.7×	1,026
Sterling	100	120	298	198	3.0×	59
Kaufman	44	100	239	195	5.4×	62
Montgomery	160	215	355	195	2.2×	3,664
Howard	60	110	253	193	4.2×	325
Taylor	39	80	228	189	5.8×	67
Bee	130	212	318	188	2.4×	512
Briscoe	75	200	263	188	3.5×	51
Lavaca	110	185	298	188	2.7×	1,266
Floyd	244	363	429	185	1.8×	36
Gregg	315	401	500	185	1.6×	126
Coleman	40	135	220	180	5.5×	121
Tyler	90	160	270	180	3.0×	558
Wheeler	85	160	264	179	3.1×	70
Austin	145	207	320	175	2.2×	1,277
San Patricio	110	200	285	175	2.6×	330
DeWitt	120	184	294	174	2.5×	576
Bailey	176	238	349	173	2.0×	76
Jackson	100	160	273	173	2.7×	381
Nolan	128	200	300	172	2.3×	95
Deaf Smith	210	330	381	171	1.8×	185
Sherman	387	450	556	169	1.4×	40
Waller	175	240	344	169	2.0×	1,143
Childress	80	160	248	168	3.1×	44
Castro	264	378	430	166	1.6×	97
Swisher	154	204	319	165	2.1×	30
Crosby	204	344	367	163	1.8×	42
Jefferson	128	210	291	163	2.3×	238
Stephens	100	190	263	163	2.6×	48
Motley	40	98	200	160	5.0×	41
Fisher	48	115	200	152	4.2×	31
Newton	85	150	236	151	2.8×	388
Donley	100	160	250	150	2.5×	123
Goliad	150	210	300	150	2.0×	403
Hale	204	304	354	150	1.7×	221
Parmer	329	406	478	149	1.5×	84
Yoakum	140	180	286	146	2.0×	89
Colorado	115	165	260	145	2.3×	1,307
Armstrong	186	270	329	143	1.8×	104
Mitchell	108	160	251	143	2.3×	55
Coke	120	180	260	140	2.2×	99
Tom Green	50	115	190	140	3.8×	658
Ward	100	135	240	140	2.4×	91
Victoria	82	140	218	136	2.7×	1,306
Potter	210	297	345	135	1.6×	890
Hartley	476	554	610	134	1.3×	97
Kent	50	108	180	130	3.6×	73
Collingsworth	72	142	200	128	2.8×	86
Cottle	70	130	197	127	2.8×	36
Dallam	453	515	580	127	1.3×	97
Oldham	226	322	344	118	1.5×	54
Winkler	154	200	272	118	1.8×	30
Lubbock	140	172	256	116	1.8×	3,533
Cameron	45	66	160	115	3.6×	160
Ector	105	140	220	115	2.1×	2,843
Callahan	46	70	160	114	3.5×	74
Crane	137	240	250	113	1.8×	141
Gaines	147	200	260	113	1.8×	3,504
Stonewall	39	72	150	111	3.8×	38
Hall	97	139	204	107	2.1×	32
Dawson	104	168	208	104	2.0×	140
Runnels	60	100	160	100	2.7×	99
Martin	65	86	160	95	2.5×	824
Garza	71	106	165	94	2.3×	65
Cochran	168	205	256	88	1.5×	80
Hockley	122	155	203	81	1.7×	677
Midland	70	100	140	70	2.0×	3,246
Wichita	25	36	90	65	3.6×	76
Hardeman	57	100	120	63	2.1×	148
Jones	37	76	100	63	2.7×	62
Lynn	124	141	183	59	1.5×	432
Foard	34	60	84	50	2.5×	48
Haskell	41	62	82	41	2.0×	67
Aransas	160	175	200	40	1.3×	665
Andrews	100	114	139	39	1.4×	413
Wilbarger	30	39	69	39	2.3×	127
Baylor	32	40	56	24	1.8×	43
Knox	42	52	61	19	1.5×	49

What this shows and what it doesn't

A wide spread usually means the county's wells reach different layers at different depths, or that the ground itself rises and falls. It does not say which depth a given tract will need.
Where the spread is wide, look at the wells within a couple of miles of the land instead of the county figure.
These are depths of real wells drilled nearby, not a promise about any property. Groundwater can change over short distances and with drought. A licensed water well driller can tell you what to expect on a specific tract.

Questions

Where in Texas does water well depth vary the most?

Does my neighbor's well depth tell me how deep mine will be?

It is the best single clue, but it is not a promise. In 5 Texas counties the home wells differ by 1,000 feet or more between the shallow and the deep end. Check the wells within a couple of miles of the land and ask a licensed driller.

Sources you can check

Texas Water Development Board, Submitted Driller's Reports database. The state's own file, rebuilt every night. Direct download (we used the file of November 10, 2026, 145 MB). SHA-256: 10b60ed0d9895e735f0b2c7833b5aa39de7a56fd68454fe16b3c14684f61ea7b
TWDB well report viewer: the official report of each well, one by one
TerraFunded, Texas Well Atlas dataset, archived on Zenodo. One row per well, no names, locations generalized to about 1.5 km. DOI 10.5281/zenodo.24126380.

Check it yourself

Download this page's table as a CSV (texas-counties-widest-well-depth-range.csv): every figure in the text is in it.
Open any county in the table. Its page lists its figures, and each well on its map opens the official report on the state's site.
For the raw data, download the state file from the TWDB link in the sources and keep the wells whose proposed use is Domestic and whose work is a new well or a replacement.
If a figure does not match, write to us with the county and the number: we correct it in the next update and say so.

How we got it

We count new and replacement domestic (home) wells with a valid depth on their report. Monitoring wells, soil borings, injection, geothermal and oilfield wells are left out. A depth under 10 feet or over 5,000 feet is treated as an entry error.

County figures use the wells finished in the last 10 years when there are at least 30; otherwise all since 2001. The median is the middle well: half are deeper, half shallower. Only counties with 30 wells or more are ranked.

The spread is the 90th percentile minus the 10th: it leaves out the shallowest tenth and the deepest tenth of the wells, so one unusual well does not set the figure.

The full method · All open data

How to cite this

TerraFunded (2026). "In McMullen County, home wells run from 130 to 2,806 feet." Texas Well Atlas. From the Texas Water Development Board, Submitted Driller's Reports database (state file of November 10, 2026). https://terrafunded.com/wells/findings/texas-counties-widest-well-depth-range. License CC BY 4.0. Dataset: https://doi.org/10.5281/zenodo.24126380.

Free to use with credit under CC BY 4.0. Journalists: write to us for any county's figures.

More findings

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