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
54,326
Plugged
145,376
Documented orphans
2,940
Largest operators active in California
| Operator | Wells | Active | Plugged | States |
|---|---|---|---|---|
| Chevron USA | 65,303 | 13,921 | 43,648 | AL AR CA CO KS LA MI ND NM OH OK PA UT WV WY |
| Aera Energy | 57,745 | 13,425 | 35,647 | CA |
| Eog Resources | 16,762 | 2,897 | 4,127 | AR CA CO KS LA MI MS MT ND NM NY OH OK PA UT WV WY |
| California Resources Production | 11,525 | 3,004 | 5,092 | CA |
| Berry Petroleum | 11,021 | 3,375 | 3,765 | AR CA CO IL KS KY OK UT WY |
| Sentinel Peak Resources California | 10,941 | 4,004 | 4,811 | CA |
| Noble Energy | 10,764 | 1,646 | 6,368 | CA CO IL KS LA MT NM OK PA UT WV WY |
| Texaco | 10,522 | 267 | 9,120 | AL AR CA CO IL KS KY LA MI MS MT ND NY OH OK PA UT |
| California Resources Elk Hills | 10,483 | 4,160 | 3,634 | CA |
| Marathon Oil | 8,999 | 2,695 | 5,360 | AR CA CO IL KS KY LA MI MS MT ND NM OK PA UT WV 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