Oil & gas wells in California
242,471 catalogued wellbores in California, from the state regulator's registry plus the federal orphaned-well inventory.
Dataset updated . Derived from public data sources.
Catalogued wells
242,471
Active
54,361
Plugged
145,487
Documented orphans
3,338
Largest operators active in California
| Operator | Wells | Active | Plugged | States |
|---|---|---|---|---|
| Chevron USA | 62,502 | 13,703 | 41,676 | CA CO ND NM OK WY |
| Aera Energy | 57,642 | 12,536 | 35,647 | CA |
| Eog Resources | 13,865 | 2,340 | 3,760 | CA CO ND NM OK WY |
| Noble Energy | 11,727 | 1,814 | 6,202 | CA CO NM OK WY |
| California Resources Elk Hills | 11,372 | 4,728 | 3,634 | CA |
| California Resources Production | 10,496 | 3,115 | 5,092 | CA |
| Sentinel Peak Resources California | 10,055 | 4,671 | 4,811 | CA |
| Berry Petroleum | 9,384 | 3,137 | 3,572 | CA CO OK WY |
| Merit Energy | 5,765 | 3,349 | 417 | CA CO ND NM OK WY |
| E & B Natural Resources Management | 5,385 | 2,027 | 1,002 | CA WY |
Well counts are the operator’s national totals; state placeholder records are excluded. See methodology.
Counties in California
Counties with 25 or more catalogued wells.
Kern156,849Los Angeles24,332Fresno12,486Orange9,085Ventura8,532Santa Barbara6,814Monterey3,871San Luis Obispo2,016Solano1,717Los Angeles Offshore1,547Yolo1,486Kings1,330Colusa1,271Glenn1,255San Joaquin1,250Sutter1,230Santa Barbara Offshore1,074Sacramento908Tulare778Contra Costa675Tehama618San Benito388Madera298Orange Offshore296San Bernardino279Butte259San Mateo245Humboldt208Merced206Imperial182Ventura Offshore171Stanislaus153Riverside138Santa Clara110Alameda100Sonoma67Santa Cruz60San Diego54Napa29