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Contra Costa County, CA oil and gas wells

675 wells: 19 active, 620 plugged, run by 154 operators.

Figures from the California Geologic Energy Management Division (CalGEM), updated 2026-10-19.

Top operators in Contra Costa

OperatorActiveWells here
Pacific Gas and Electric Company1729
Reabold California, LLC25
Chevron U.S.A. Inc.050
Occidental Petroleum Corporation048
Shell Western E&P Inc.038
Western Continental Operating Company034
California Resources Production Corporation031
The Termo Company022
Trico Industries Inc014
Sunset Exploration, Inc.012
UMC Petroleum Corp.012
Venturini Associates Inc.011
Natural Gas Corp. of Calif.010
Tonka Energy, Inc.010
Atlantic Oil Company09
Nahama & Weagant Energy Company09
PEOCO, LLC09
Sinco Oil Corp.09
Arkoma Production Company of California08
Conoco Inc.08
Dekalb Energy Co.08
Great Yellowstone Corp.08
Phillips Petroleum Co.08
Phillips Petroleum Company08
Production Specialties Company08

Wells

Not plugged · All wells · Plugged · Orphaned

WellAPI / IDStatusTypeOperator
(no name) 1 04-013-20381Plugged Dry hole—
Ackerman 28-2 04-013-00262Plugged Dry holeGarner, Lyle A.
Ackerman 28-1 04-013-00263Plugged Dry holeGarner, Lyle A.
Ackerman 1 04-013-20049Plugged Dry holeSinco Oil Corp.
Almond 2 04-013-00214Plugged Dry holeArdly Petro. Co.
Almond 1 04-013-00215Plugged Dry holeArdly Petro. Co.
Almond 6 04-013-00217Plugged Dry holeLightning Gas & Oil Co.
Almond 5 04-013-00218Plugged Dry holeLightning Gas & Oil Co.
Almond 3 04-013-00219Plugged Dry holeArdly Petro. Co.
Almond 4 04-013-00220Plugged Dry holeLovely Petro. Co.
Alves 1 04-013-00200Plugged Dry holeTrico Industries Inc
Amerada T. A. Dev. Co. 33-1X 04-013-00294Plugged Dry holeSeaboard Oil & Gas Co.
Amerada-Baldocchi et al 1 04-013-00298Plugged Dry holeOccidental Petroleum Corporation
Amerada-Honegger 1-34 04-013-00001Plugged Dry holeVenoco, LLC
Amerada-Honegger 1 04-013-20014Plugged Dry holeS. M. Reynolds, Opr.
Amerada-Signal Delta Unit 3 1 04-013-00291Plugged Dry holeAmerada Hess Corp.
Ames 33X-16 04-013-20158Plugged GasDekalb Energy Co.
Andrade 1 04-013-20012Plugged Oil & gasMaria L. Andrade
Andrade 2 04-013-20013Plugged Oil & gasSinco Oil Corp.
Andrade 3 04-013-20032Plugged Oil & gasMaria L. Andrade
Andrade 4 04-013-20045Plugged Oil & gasMaria L. Andrade
Andrade 5 04-013-20124Plugged Oil & gasMaria L. Andrade
Antioch Unit A 1 04-013-00278Plugged Dry holeBrazos Oil and Gas Company
Arata 42-10 04-013-00026Plugged Oil & gasSunset Exploration, Inc.
Arata 44-10 04-013-00027Plugged Oil & gasSunset Exploration, Inc.
Arata 1-25 04-013-20163Plugged Dry holeUMC Petroleum Corp.
Arkoma-Sherman 1 04-013-20237Plugged Dry holeWestern Continental Operating Company
Arnaudo 18-1 04-013-20310Plugged Dry holeEOG Resources, Inc.
Arrighi 1 04-013-20118Plugged Dry holePhillips Petroleum Company
Audrey Smith 1 04-013-20134Plugged GasWestern Continental Operating Company
Avon 2-1 04-013-00139Plugged GasChevron U.S.A. Inc.
Avon A 1 04-013-20062Plugged Dry holePhillips Petroleum Company
Avon Unit 1 04-013-00138Plugged GasUMC Petroleum Corp.
Avon Unit 2 04-013-20164Plugged Dry holeUMC Petroleum Corp.
Bacchini 1 04-013-20245Plugged GasChannel Exploration Company
Baker et al 2 04-013-00212Plugged Dry holeChevron U.S.A. Inc.
Baker et al 1 04-013-00213Plugged Dry holeChevron U.S.A. Inc.
Baldocchi 1 04-013-20162Plugged Dry holeDelaware Northwest Exploration Co.
Baldocchi 1 04-013-20193Plugged Dry holeG-W Resources Oper. Co.
Baldocchi 16-1 04-013-20241Plugged Dry holeArkoma Production Company of California
Baldwin-Soite 1 04-013-00125Plugged Dry holeJohn Baldwin, Oper.
Balfour Unit 1-18 04-013-20315Plugged Dry holeFleet Oil Co.
Baptist Church 1 04-013-00211Plugged Dry holePauley Petroleum Inc.
Bartells 1 04-013-00264Plugged Dry holeOccidental Petroleum Corporation
Bartels 1-32 04-013-20225Plugged Dry holeMay Petroleum Inc.
Bartels 1-32 04-013-20281Plugged Dry holeNorthern Michigan Exploration Company
Bedford Properties 1 04-013-20303Plugged Dry holeTri-Valley Oil & Gas Co.
Bethel Island Community 1 04-013-00224Plugged Dry holeChevron U.S.A. Inc.
Bethel Unit 1 1 04-013-00008Plugged GasUnion Oil Company of California
Bethlehem 1 04-013-20043Plugged Gas6200 GR LLC
Bethlehem 2-R 04-013-20050Plugged Oil & gas6200 GR LLC
Biancalana 1 04-013-00013Plugged Dry holeSumpf-Williams
Big Break 1-25 04-013-20243Plugged GasNahama & Weagant Energy Company
Big Break 2-25 04-013-20249Plugged Oil & gasEnerfin Resources Northwest Limited Partnership
Big Break 3-25 04-013-20283Plugged Oil & gasEnerfin Resources Northwest Limited Partnership
Big Break 1-24 04-013-20294Plugged GasNahama & Weagant Energy Company
Big Break 2-24 04-013-20306Plugged GasEnerfin Resources Northwest Limited Partnership
Bigelow 1-27 04-013-20217Plugged Dry holeHamilton Brothers Oil Company
Bixler 1-14 04-013-20361Plugged GasSunset Exploration, Inc.
Bloomfield 1 04-013-20143Plugged Dry holeFilon Expl. Corp.
Bloomfield 1-11 04-013-20248Plugged GasRoyale Energy, Inc.
Bloomfield 2-11 04-013-20316Plugged GasNorth Valley Oil & Gas Co.
Bloomfield 1A 04-013-20346Plugged GasRoyale Energy, Inc.
Bloomfield et al 1 04-013-00270Plugged Dry holeOccidental Petroleum Corporation
Bonde-Bloomfield 2-15 04-013-00028Plugged Oil & gasProduction Specialties Company
Bonde-Bloomfield 21-15 04-013-00033Plugged Oil & gasShell Western E&P Inc.
Bonnickson 48-7 04-013-20137Plugged GasDekalb Energy Co.
Bonnickson 37-7 04-013-20219Plugged GasSunset Exploration, Inc.
Bourroughs-Cloverleaf 1 04-013-20091Plugged GasPhillips Petroleum Company
Boylan 1 04-013-00090Plugged GasChevron U.S.A. Inc.
Boylan 2 04-013-00092Plugged GasChevron U.S.A. Inc.
Bradford Community 8 04-013-00004Plugged Dry holeRosetta Resources Operating LP
Brazos-Canada 1 04-013-00279Plugged Dry holeS. M. Reynolds, Opr.
Brentwood Farms 1 04-013-00271Plugged Dry holeMarathon Oil Company
Brentwood Townsite 1 04-013-20246Plugged GasDekalb Energy Co.
Brentwood Townsite 1 04-013-20285Plugged GasHorizon Operating Co.
Brown's Island Unit 1 04-013-00275Plugged Dry holeOccidental Petroleum Corporation
Burcio-Mori 1-6 04-013-20379Plugged GasSunset Exploration, Inc.
Buttes-Baldocchi 1 04-013-20009Plugged Dry holeLayne Oil Co.
Buttes-Costa 1 04-013-00187Plugged Dry holeVenoco, LLC
Buttes-Otto 1 04-013-00188Plugged Dry holeVenoco, LLC
Buttes-Transamerica 1 04-013-20031Plugged Dry holeAlpine Oil & Gas Corp.
Buttes-Transamerica 2 04-013-20047Plugged Dry holeAlpine Oil & Gas Corp.
Buttes-Wiedemann 1 04-013-00191Plugged Dry holeVenoco, LLC
C-H-K Unit 1 04-013-20095Plugged Dry holeSeaboard Oil & Gas Co.
C.C.C.W.D. 1 04-013-00137Plugged GasChevron U.S.A. Inc.
C.L. Floto 2-A 04-013-00164Plugged Dry holeChevron U.S.A. Inc.
C.L. Floto 3 04-013-00165Plugged Dry holeChevron U.S.A. Inc.
Cabeen-Southport 1 04-013-00246Plugged Dry holeCabeen Exploration Corp
Cal-Bay 2 04-013-00177Plugged GasTrico Industries Inc
Caldeira 1 04-013-20052Plugged Dry holeJ. L. Davis
California Water Service 1 04-013-00136Plugged Dry holeChevron U.S.A. Inc.
Calplans-New Love 1 04-013-20142Plugged Dry holeChevron U.S.A. Inc.
Calplans-Taylor Slough 1 04-013-20139Plugged GasChevron U.S.A. Inc.
Calplans-Taylor Slough 6 04-013-20177Plugged GasNahama & Weagant Energy Company
Calplans-Taylor Slough 3 04-013-20189Plugged Dry holeChevron U.S.A. Inc.
Calplans-Taylor Slough 4 04-013-20209Plugged GasChevron U.S.A. Inc.
Calplans-Taylor Slough 5 04-013-20270Plugged Dry holeNahama & Weagant Energy Company
Canada 4-33 04-013-00280Plugged Dry holeShell Western E&P Inc.
Canada Community 1 04-013-00281Plugged Dry holeChevron U.S.A. Inc.

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