Best well drillers in Sonoma County, California

Not a pay-to-play list: these are the 152 drilling companies with wells on record in Sonoma County, ranked by wells actually drilled here — 31,434 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.

152companies on record

53active since 2022

31,434wells in county record

#	Company	In Sonoma Co. since 2016	All-time in county	Statewide
1	Weeks Drilling And Pump Co.	896	9,110	14,789
2	Fisch Brothers Drilling, Inc.	725	3,221	6,393
3	Les Petersen Drilling & Pump Inc.	324	3,896	4,096
4	Irwin Well Drilling	307	1,846	1,906
5	Mickelson Enterprises Inc.	134	147	174
6	Clear Heart Drilling Inc.	127	423	694
7	Cascade Drilling L P	83	84	2,827
8	Nutting And Jensen Drilling	37	1,362	1,410
9	Koenig Drilling	35	35	39
10	Cascade Drilling LP	23	24	826
11	Cardno Inc.	23	23	28
12	Bertram Drilling Inc.	22	43	1,171
13	Huckfeldt Well Drilling Inc.	19	72	1,881
14	American Construction And Supply Inc.	18	40	1,685
15	Pitcher Services LLC	9	9	114
16	Gregg Drilling LLC	7	7	558
17	Gregg Drilling & Testing Inc.	6	126	4,828
18	T S A Drilling Inc. Dba Penecore Drilling	6	12	577
19	Gregory Drilling Incorporated	4	4	143
20	MC Lean & Williams Inc.	3	11	830
21	Larbre Well Drilling And Pumps Inc.	2	860	895
22	Woodward Drilling Company Inc.	2	89	1,542
23	V T S Drilling LLC	2	12	92
24	Sullivan Drilling Inc.	2	2	1,387
25	Parks Water Resources	2	2	385
26	Well Industries Inc.	2	2	558
27	Will Peterson Well Drilling	2	2	173
28	Signal Drilling Company	1	1,217	8,301
29	Anderson K Drilling, Inc.	1	754	1,136
30	Koenig Enterprises	1	64	83
31	Gopher Drilling	1	41	79
32	A B C Liovin Drilling Inc.	1	12	1,281
33	Maggiora Bros Drilling Inc.	1	12	4,674
34	National E W P Inc.	1	9	431
35	Roadrunner Drilling & Pump Company Inc.	1	3	205
36	Castle Construction & Well Drilling Inc.	1	3	142
37	Superior Pump & Drilling Inc.	1	1	369
38	Jak Drilling And Pump	1	1	62
39	Crislip Drilling Company	—	1,114	1,174
40	Tri-K Drilling	—	897	935
41	Hammond Bros	—	847	847
42	Ballard & Foote	—	818	870
43	Bartley Pump Inc.	—	539	596
44	Fisch Bros Pump Service	—	315	620
45	Harold Nutting	—	310	313
46	R F Keyt	—	254	299
47	Walter F Rettela	—	208	389
48	Weeks Drilling Co.	—	202	217
49	Mel Meyer	—	184	101,127
50	Burnham & Plum Well Drilling Co. Inc.	—	168	177
51	American Well & Pump Service	—	164	254
52	Larbre Well Driller	—	135	138
53	Jim's Pump & Drilling	—	133	157
54	W D C Exploration & Wells	—	128	2,421
55	Cowart Well Drilling	—	126	131
56	Ray Peterson Well Drilling	—	114	114
57	Orsolini Well Drilling	—	110	112
58	Clarence Woodbury	—	107	113
59	Pacific Gas And Electric Company	—	83	264
60	Oberto's Plumbing & Well Drilling	—	66	78
61	Xxx	—	55	113
62	Cascade Drilling Inc. - California	—	46	3,167
63	A J Oberto	—	44	47
64	Dejesus Pump & Well Drilling Inc.	—	42	1,157
65	Zeno Strout	—	42	42
66	Atec Drilling Co.	—	38	63
67	William A Duer	—	35	35
68	James And Wilkerson Drilling	—	34	37
69	Davis D A Company	—	33	34
70	Gerald Foster	—	32	34
71	Dudley Newton JR	—	25	38
72	Tock-Bishop Well Drilling	—	24	201
73	Rettela & Pulliam	—	21	129
74	Bill Pulliam	—	20	1,299
75	Doshier-Gregson Inc.	—	15	1,156
76	Enprobe Environental Direct Push & Drilling Services	—	15	76
77	Pitcher Drilling Co.	—	12	1,232
78	Johnson Drilling Co.	—	11	11,865
79	Bess D Pump & Well Elect	—	11	359
80	Pulliam Well Exploration Inc.	—	11	234
81	E E Luhdorff	—	11	155
82	Pacific Coast Drilling	—	10	262
83	Kelley Pump & Drilling	—	9	1,515
84	Western Well Drilling Co. Ltd	—	9	842
85	Vironex, Inc.	—	9	649
86	Dyna Drill International Inc.	—	9	115
87	Eaton Drilling Co. LLC	—	8	3,793
88	Resonantsonic International Inc.	—	8	397
89	Heer Nar S	—	8	245
90	Rural Drilling Co.	—	8	55
91	Bc2 Environmental LLC	—	7	416
92	Layne Christensen Company	—	7	2,362
93	Kile's Well Drilling	—	7	943
94	Doshier And Gregson Drilling Inc.	—	7	489
95	Layne-Western Co. Inc.	—	6	255
96	Bishop Electric	—	6	43
97	Big Valley Drilling & Exploration Co.	—	6	32
98	Aaa Pump	—	6	28
99	Fisch Drilling And Pump Inc.	—	5	663
100	Beylik Drilling & Pump Service	—	5	1,267
101	Spectrum Exploration Inc.	—	5	307
102	Doshier-Gregson Well Drilling Service	—	5	167
103	Pacific Coast Well & Pump Inc.	—	4	182
104	Britton Exploration	—	4	36
105	West Hazmat Drilling Corp	—	4	1,702
106	Wasco Drilling Company, Inc.	—	4	554
107	Mitchell Drilling Environmental Corp	—	4	199
108	Precision Drilling Co.	—	4	71
109	Larry Herman Drilling	—	4	34
110	Peters Drilling And Pump Service	—	3	11,563
111	DE LA Grange & Sons Inc.	—	3	263
112	Cache Creek Drilling	—	3	247
113	Moss Roscoe Company	—	3	1,220
114	R & B Drilling	—	3	761
115	All Well Abandonment	—	3	607
116	Testamerica Drilling Corp	—	3	378
117	Precision Sampling Inc.	—	3	234
118	Mclean & Williams Well Drilling	—	3	116
119	Cornerstone Pump & Well Inc.	—	3	90
120	Santa Rosa Drilling Co.	—	3	77
121	J W Evans & Sons	—	3	44
122	Zim Industries Inc. Dba Bakersfield Well & Pump Co.	—	2	1,716
123	Kvilhaug Drilling & Pump Inc.	—	2	327
124	Confluence Environmental Inc.	—	2	65
125	C & N Pump & Well Co.	—	2	697
126	Wayne Environmental Drilling Company Inc.	—	2	664
127	Aqua Science Engineers Inc.	—	2	131
128	Welltest Inc.	—	2	52
129	Baker Scott	—	2	33
130	Nor-Cal Pump & Well Service	—	2	26
131	Myers Brothers Well Drilling Inc.	—	1	2,865
132	Martell Water Systems Inc.	—	1	1,094
133	Condon-Johnson & Associates Inc.	—	1	25
134	Exploration Geoservices Inc.	—	1	956
135	Boart Longyear Company	—	1	172
136	Acme Drilling Company	—	1	1,439
137	Arrow Well Drilling	—	1	1,202
138	S A Andresen All Terrain Exploration	—	1	468
139	Bayland Drillers	—	1	317
140	Robert Garcia Well & Pump Co.	—	1	192
141	United Drilling	—	1	152
142	Roscoe Moss Company	—	1	130
143	The Darrah Drilling Corp	—	1	124
144	Barnes Core Drlg	—	1	86
145	Ase Drilling Inc.	—	1	82
146	Williams Bros Well Drilling	—	1	77
147	Ost-Air Drilling	—	1	56
148	R Barrick For Great Sierra	—	1	55
149	J C Water Well Drilling	—	1	52
150	Xxx Soils Exploration SV	—	1	48
151	Cofferdam Unwatering Corporation	—	1	32
152	Mclaren Environmental Engineering	—	1	30

Ranked by wells drilled in Sonoma 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 Sonoma County?

Weeks Drilling And Pump Co. has drilled the most Sonoma County wells in the recent record — 896 since 2016, 9,110 in the county all-time.

How many well drilling companies work in Sonoma County?

152 companies in the DWR record have drilled wells in Sonoma County; 53 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 Sonoma County?

The median drilled depth in Sonoma County is 195 ft, based on 37,891 recorded wells. Depths, water levels, and yields are on the Sonoma County wells page.

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

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