⟁ California Well Data field records · 2026 survey

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Best well drillers in San Joaquin County, California

Not a pay-to-play list: these are the 185 drilling companies with wells on record in San Joaquin County, ranked by wells actually drilled here — 15,393 logged wells in the California Department of Water Resources (DWR) Well Completion Reports database (records as of 2026-08-14). Every number links back to the public record.

185companies on record
63active since 2022
15,393wells in county record
#CompanyIn San Joaquin Co. since 2016All-time in countyStatewide
1 Masellis Drilling Inc. 589 2,654 6,081
2 Castle Well Drilling Inc. 168 168 294
3 Hennings Bros Drilling Co. Inc. 147 2,845 6,823
4 Purviance Drillers Inc. 84 572 663
5 Calwater Drilling Company Inc. 80 1,154 5,421
6 R & M Water Well Drilling & Pumps Inc. 61 61 91
7 D & D Drilling Inc. Dba Valley Drilling Co. 60 774 1,282
8 Canepa And Sons Inc. 55 100 3,173
9 A & A Gross Drilling 49 582 816
10 Cascade Drilling L P 39 105 2,827
11 Castle Construction & Well Drilling Inc. 31 32 142
12 American Construction And Supply Inc. 21 46 1,685
13 Altamont Water Well And Pump 18 18 90
14 Gregory Drilling Incorporated 17 17 143
15 T S A Drilling Inc. Dba Penecore Drilling 16 43 577
16 R & M Drilling 16 22 25
17 Guardino Well Drilling Inc. 16 17 1,736
18 Living Water Well Drilling 16 16 441
19 Corrpro Companies Inc. 16 16 737
20 All Well Abandonment 15 109 607
21 West Coast Exploration Inc. 13 19 30
22 Ken Gross Pump Service 12 126 507
23 Gregg Drilling & Testing Inc. 10 90 4,828
24 Maggiora Bros Drilling Inc. 8 23 4,674
25 Roscoe Moss Company 8 9 130
26 Pitcher Services LLC 8 8 114
27 Nor - Cal Pump & Well Drilling Inc. 6 7 248
28 Gregg Drilling LLC 6 6 558
29 Slagle Drilling Corp 6 6 45
30 Zim Industries Inc. Dba Bakersfield Well & Pump Co. 5 14 1,716
31 Quality Well Drillers Inc. 5 14 3,524
32 Cascade Drilling LP 5 11 826
33 Points West Drilling 5 6 78
34 Yellow Jacket Drilling Services LLC 4 4 291
35 Taber Drilling 4 4 87
36 V & W Drilling 3 38 310
37 Eaton Drilling Co. LLC 3 22 3,793
38 Stonehouse Well Drilling 3 12 157
39 Roadrunner Drilling & Pump Company Inc. 3 4 205
40 Well Industries Inc. 3 3 558
41 Jensen Kelin Drilling 3 3 94
42 Geocentric Drilling Inc. 2 2 81
43 Directed Technologies Drilling Inc. 2 2 29
44 Signal Drilling Company 1 275 8,301
45 Woodward Drilling Company Inc. 1 66 1,542
46 Myers Brothers Well Drilling Inc. 1 29 2,865
47 Layne Christensen Company 1 19 2,362
48 Martell Water Systems Inc. 1 15 1,094
49 M & M Well Drilling 1 3 74
50 Bradley & Sons Inc. 1 2 3,627
51 Modern Technology Resources Inc. 1 2 44
52 Prieto Anthony J Water Well Drilling Inc. 1 1 637
53 Strickland Enterprises Inc. 1 1 2,026
54 Arsenal Well Drilling Inc. 1 1 234
55 Yosemite Falls Inc. 1 1 706
56 Vics Well Drilling Inc. 1 1 337
57 Hch Water Wells Inc. 1 1 43
58 Panero Well Drilling Inc. — 790 921
59 Mel Meyer — 671 101,127
60 Martin Pump & Supply Inc. — 582 2,524
61 Clark Well Inc. — 269 273
62 Norton Drilling — 259 596
63 Cascade Drilling Inc. - California — 195 3,167
64 John L Panero JR — 168 188
65 San Joaquin Pump Co. — 150 150
66 Western Well Drilling Co. Ltd — 126 842
67 Stockton Armature & Motor Works — 116 116
68 Thayer Well Drilling — 113 125
69 Blake Hennings — 110 1,362
70 Gibson Well Drilling — 107 115
71 Harrison & Son's — 95 187
72 Woods Well Drilling — 79 755
73 W D C Exploration & Wells — 69 2,421
74 Radulovich Well Drilling — 65 67
75 Clark Well Drilling Co. — 61 63
76 A J Kessel — 58 58
77 B R Purviance — 54 86
78 Shoup Burton C Well Drilling And Pumps — 53 79
79 Harvey Shoup — 49 49
80 Jeffrey L Gross — 47 103
81 Valley Water Well Drilling And Pump Co. — 47 59
82 Weimer Stan Enterprises Inc. — 44 377
83 Goehring Well Drilling — 44 66
84 Machado Inc. — 39 40
85 National E W P Inc. — 38 431
86 Walter G Noack & Son Inc. — 35 35
87 Universal Pump & Supply Inc. — 34 43
88 Johnson Drilling Co. — 32 11,865
89 John Panero And Carl Mcleister — 30 41
90 George Stamp — 29 44
91 Osterberg And Carroll — 28 561
92 Modesto Well Drillers — 26 124
93 Baker Lester A Wells & Pumps — 24 191
94 Valley Home Drilling Co. — 24 67
95 Quentin Y Thayer — 24 26
96 Pitcher Drilling Co. — 23 1,232
97 Moss Roscoe Company — 23 1,220
98 Wahl & Wood Drilling — 22 58
99 Dejesus Pump & Well Drilling Inc. — 21 1,157
100 Clear Heart Drilling Inc. — 16 694
101 Heer Nar S — 12 245
102 Beylik Drilling & Pump Service — 11 1,267
103 Big Valley Drilling & Exploration Co. — 11 32
104 C & N Pump & Well Co. — 10 697
105 Pacific Gas And Electric Company — 10 264
106 Tanko Well Drilling — 9 3,311
107 Turner Explorations Inc. — 9 200
108 Carrell & Canepa Drilling — 9 79
109 Seebeck M E — 8 567
110 West Hazmat Drilling Corp — 8 1,702
111 Wayne Environmental Drilling Company Inc. — 8 664
112 Spectrum Exploration Inc. — 8 307
113 Canada Pump Sales & Service Inc. — 8 73
114 Valley Well Drilling LP — 7 410
115 Scott Xxx PC Exploration Inc. — 7 154
116 B & W Drilling — 7 132
117 Hurd, Clarence — 6 77
118 S I Guardino — 6 43
119 S A Andresen All Terrain Exploration — 5 468
120 Testamerica Drilling Corp — 5 378
121 Humboldt Drilling & Pump Co. — 5 131
122 H Allen Herr Domestic Well Drilling — 5 45
123 Ballard & Foote — 4 870
124 Simpson Drilling Company — 4 644
125 Big Valley Drilling — 4 294
126 R D Norris & Son — 4 237
127 Winter Abajian Well Drilling — 4 203
128 Pearson Well Drilling — 4 176
129 DE Lucchi Well & Pump, Inc. — 4 157
130 Hydro Resources - West Inc. — 4 97
131 D & S Well Drilling — 4 84
132 Xxx Soils Exploration SV — 4 48
133 Vaca Drilling Co. /Del Crew JR — 3 2,745
134 Osterberg And Stewart — 3 636
135 Cullum Systems Incorporated — 3 277
136 Cornerstone Pump & Well Inc. — 3 90
137 Koenig Enterprises — 3 83
138 Dan's Water Well & Pump Service Inc. — 3 37
139 S D Drilling Inc. — 3 31
140 Waterwell Plus — 3 27
141 Bertram Drilling Inc. — 2 1,171
142 Bill Belknap — 2 2,758
143 Acme Drilling Company — 2 1,439
144 D Hedman & Co. — 2 1,305
145 Hunt Drilling Company Inc. — 2 1,213
146 Myers Brothers Inc. — 2 796
147 Salinas Pump Company — 2 712
148 Preston Well Drilling — 2 698
149 Bootjack Drilling Inc. — 2 649
150 Resonantsonic International Inc. — 2 397
151 C. Cruse Drilling — 2 301
152 Precision Sampling Inc. — 2 234
153 Island Drilling — 2 221
154 Anderson & Seebeck — 2 178
155 Glenn Martell & Son Inc. — 2 164
156 E E Luhdorff — 2 155
157 M S Seebeck & Son — 2 75
158 Ben Barrow Company — 2 49
159 Howk Well & Equipment Co. — 2 48
160 Arthur's Well Drilling — 2 41
161 Weeks Drilling And Pump Co. — 1 14,789
162 Fisch Brothers Drilling, Inc. — 1 6,393
163 Valley Pump & Motor Works Inc. — 1 181
164 Pacific Coast Drilling — 1 262
165 Tanko Bros Inc. — 1 2,617
166 Sargent Drilling — 1 442
167 Drilling Services Inc. — 1 63
168 Guardino Pump & Well — 1 482
169 Myers Reverse, Inc. — 1 2,389
170 Water-Tech Well Drilling — 1 665
171 Frank Scully/Morrison Drilling Inc. — 1 582
172 West Coast Drilling — 1 288
173 H A M Drilling Inc. — 1 273
174 Layne-Western Co. Inc. — 1 255
175 Mitchell Drilling Environmental Corp — 1 199
176 Jeffrey David Harra — 1 109
177 Clark F Wells Corp — 1 83
178 Ase Drilling Inc. — 1 82
179 Precision Drilling Co. — 1 71
180 Robertson Bros — 1 68
181 Robertson Drilling Co. — 1 61
182 Groundwater Technology — 1 46
183 Cofferdam Unwatering Corporation — 1 32
184 Foothill Drilling — 1 26
185 Nor-Cal Pump & Well Service — 1 26

Ranked by wells drilled in San Joaquin County since 2016 (then all-time), from the full DWR record. A ★ marks a featured sponsor — sponsors must appear in the county record to be listed, and the ranking below them is never reordered.

Who drills the most wells in San Joaquin County?

Masellis Drilling Inc. has drilled the most San Joaquin County wells in the recent record — 589 since 2016, 2,654 in the county all-time.

How many well drilling companies work in San Joaquin County?

185 companies in the DWR record have drilled wells in San Joaquin County; 63 of them have drilled somewhere in California since 2022. Smaller operators below the record threshold may also serve the area.

How deep is a typical well in San Joaquin County?

The median drilled depth in San Joaquin County is 235 ft, based on 21,729 recorded wells. Depths, water levels, and yields are on the San Joaquin County wells page.

Well depths, static water levels, tested yields, and drilling cost estimates for this county live on the San Joaquin County wells page.

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