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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
Capital Co. A 1 04-013-20041Plugged Dry holeAmerada Hess Corp., Operator
Capital-Enea 3 04-013-20269Plugged Oil & gasVenturini Associates Inc.
Cardoza 1 04-013-20018Plugged Dry holeUMC Petroleum Corp.
Carpenter 1 04-013-00252Plugged Dry holeShell Western E&P Inc.
Castello 2-23 04-013-00261Plugged Dry holeShell Western E&P Inc.
Cecchini 1-32 04-013-20314Plugged Dry holeNorth Valley Oil & Gas Co.
Central Valley Farms 1 04-013-20046Plugged Dry holeChevron U.S.A. Inc.
Cerri-Bettencourt 1-3 04-013-20322Plugged Dry holeNorth Valley Oil & Gas Co.
Chase-Edgington 1 04-013-20063Plugged Dry holeWestern Continental Operating Company
Chaves 1 04-013-00146Plugged GasOccidental Petroleum Corporation
Chevron-Culbertson 2 04-013-20296Plugged GasBlack Mountain Oil Co.
Chevron-Culbertson 3 04-013-20302Plugged GasBlack Mountain Oil Co.
Cloverleaf Farms 1 04-013-20007Plugged Dry holeUnion Oil Company of California
Clyde 2 04-013-00129Plugged Dry holeNordon Corp. Ltd.
Clyde Co. 1 04-013-00143Plugged Dry holeTrico Industries Inc
Coakley 1 04-013-20086Plugged Dry holeClients Oil Co.
Coelho & Sons 1 04-013-00003Plugged Dry holeUMC Petroleum Corp.
Collier 1 04-013-00201Plugged Dry holeJ. S. Cullinan Ii
Concord Owners 1 04-013-00209Plugged Dry holeChevron U.S.A. Inc.
Concord Unit 2 1 04-013-00017Plugged GasChevron U.S.A. Inc.
Concord Unit 2 2 04-013-00094Plugged Dry holeChevron U.S.A. Inc.
Continente 1-10 04-013-00030Plugged GasProduction Specialties Company
Continente 2-3 04-013-00031Plugged Dry holeShell Western E&P Inc.
Continente 1 04-013-20103Plugged GasWestern Continental Operating Company
Contra Costa County 1 04-013-00205Plugged Dry holeTrico Industries Inc
Conway-Conti 1 04-013-00088Plugged Dry holeJames B. & Archie A. MacDonald
Cooper 1 04-013-20039Plugged Dry holeTanner Oil Operations
Core Hole 1 04-013-00228Plugged ServiceMarathon Oil Company
Core Hole 2 04-013-00229Plugged ServiceMarathon Oil Company
Core Hole 3 04-013-00230Plugged ServiceMarathon Oil Company
Core Hole 1 04-013-00287Plugged ServiceShell Western E&P Inc.
Cowell Foundation 1-26 04-013-20099Plugged Dry holeMobil Oil Exploration & Production North America, Inc.
Culbertson 1 04-013-20282Plugged Dry holeChevron U.S.A. Inc.
Cunha 1-1 04-013-00250Plugged Dry holeShell Western E&P Inc.
Dal Porto 1 04-013-20010Plugged GasWestern Continental Operating Company
Dal Porto 2 04-013-20113Plugged GasWestern Continental Operating Company
Dal Porto-Shell 1 04-013-00170Plugged Dry holeHelm Co. & Robert Sumpf
Dal Porto-Shell 2 04-013-00175Plugged Dry holeRobert Sumpf
Dal Porto-Transamerica 3 04-013-20125Plugged GasWestern Continental Operating Company
Dallas et al 1-6 04-013-20147Plugged Dry holeUMC Petroleum Corp.
Dalton Farms 1 04-013-00273Plugged Dry holeSanta Fe Minerals
Danielson-Moore 1-30 04-013-20129Plugged Dry holeUMC Petroleum Corp.
Danno 1 04-013-00130Plugged Dry holeLen Owens & J. Dewitt Expl. Co.
Darby Lynn 1 04-013-20343Plugged GasABA Energy Corporation
Davis 52-18 04-013-20141Plugged Dry holeDekalb Energy Co.
Davis-Venturini 1 04-013-00009Plugged Oil & gasJohn Pestana Family Trust
Davis-Venturini 2 04-013-00074Plugged Oil & gasJohn Pestana Family Trust
Deeairie 1 04-013-20098Plugged Dry holeClients Oil Co.
Deer Valley 1-20 04-013-20291Plugged Dry holeWestern Continental Operating Company
Del Barba 1-36 04-013-00295Plugged Dry holeShell Western E&P Inc.
Del Barba 1 04-013-20030Plugged GasWestern Continental Operating Company
Delta Properties 3 04-013-00122Plugged GasUnion Oil Company of California
Delta Properties 6 04-013-00285Plugged Dry holeUnion Oil Company of California
Delta Properties 1 04-013-20221Plugged Dry holeRussell H. Green, Jr.
Delta Unit 1 1 04-013-00301Plugged Dry holeMobil Oil Corporation
Delta Unit 3 2 04-013-00300Plugged Dry holeAmerada Hess Corp., Operator
Dempsey 3-3 04-013-00032Plugged Dry holeShell Western E&P Inc.
Diamond Properties 1 04-013-00286Plugged Dry holeUnion Oil Company of California
Diamond Properties 1 04-013-20110Plugged Dry holeAtlantic Oil Company
Dianda 1 04-013-20167Plugged Dry holeClarion Res. Inc.
Disco Inferno 1 04-013-20359Plugged GasProduction Specialties Company
Domingo 25-1 04-013-20260Plugged Dry holeArkoma Production Company of California
Don 1 04-013-00225Plugged Dry holeChevron U.S.A. Inc.
Dow-Termo Ward 39 04-013-20100Plugged Oil & gasBridlegate Holding Company, LLC
Du Pont 1 04-013-20048Plugged Dry holeGreat Yellowstone Corp.
Du Pont 2 04-013-20057Plugged Dry holeGreat Yellowstone Corp.
Duarte 1-17 04-013-00131Plugged StoragePacific Gas and Electric Company
Duarte 2-17 04-013-00132Plugged StoragePacific Gas and Electric Company
Duarte 1 04-013-20011Plugged GasWestern Continental Operating Company
Duarte 2-35 04-013-20036Plugged Dry holeGreat Yellowstone Corp.
Duarte 1 04-013-20311Plugged Dry holeRio Delta Resources
Dutra 1 04-013-00297Plugged Dry holeAmerada Hess Corp.
Dutra 1 04-013-20094Plugged Dry holeConoco Inc.
Dutra 1 04-013-20112Plugged Dry holeLeclair-Westwood, Inc.
Dutra-Newbury 1 04-013-20111Plugged Dry holePhillips Petroleum Company
Dutra-Newbury Unit 1 04-013-20001Plugged Dry holeAmerada Hess Corp.
E.C. Rasmussen 1 04-013-00240Plugged Dry holeTassajara Oil Corp.
East Bay 1 04-013-00197Plugged Dry holeShell Western E&P Inc.
East Mirror 16-88X 04-013-20325Plugged GasNahama & Weagant Energy Company
Edna H. Thomas, et al 1 04-013-00272Plugged Dry holeBrazos Oil and Gas Company
Elsworthy 1 04-013-20120Plugged Dry holeMitchell Energy Corp.
Elworthy 1 04-013-00006Plugged Dry holePhillips Petroleum Company
Elworthy 1 04-013-00247Plugged Dry holeChevron U.S.A. Inc.
Emerson 1 04-013-00293Plugged Dry holeOccidental Petroleum Corporation
Emerson Dairy 1 04-013-20233Plugged Dry holeShoshone Oil Corp.
Enea 1 04-013-20264Plugged Oil & gasVenturini Associates Inc.
Enea 2 04-013-20265Plugged Oil & gasVenturini Associates Inc.
Enea-Capital 2-8 04-013-00034Plugged GasOccidental Petroleum Corporation
Enea-Capitol 4 04-013-20292Plugged Oil & gasVenturini Associates Inc.
Ennis 1 04-013-20066Plugged Dry holeImperial Oil & Gas Ltd.
Enos 1-10 04-013-20266Plugged Dry holeQuintana Petroleum Corporation
Fairview 2-1 04-013-20181Plugged Dry holeVenada National
Faria 1 04-013-00176Plugged Dry holeCal-Bay Corp.
Faria 1 04-013-20175Plugged GasCalifornia Resources Production Corporation
Faria 2 04-013-20182Plugged GasHilliard Oil & Gas, Inc.
Faria Unit 1 04-013-00178Plugged GasThe Termo Company
Faria Unit 2 04-013-00179Plugged GasThe Termo Company
Faria Unit 3 04-013-00180Plugged GasThe Termo Company
Faria Unit-Alvernaz 1 04-013-00181Plugged Dry holeTrico Industries Inc
Felker-Strass 1-18 04-013-20194Plugged Dry holeArgo Petroleum Corp.

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