Oil & gas wells in San Joaquin County, CA
1,250 catalogued wells in San Joaquin County, California, from the state regulator registry and the federal orphaned-well inventory.
Dataset updated . Derived from public data sources.
At a glance
San Joaquin County, California has 1,250 catalogued oil & gas wells: 101 active (8%), 997 plugged & abandoned (80%) and 12 documented orphans. It ranks 15th of the 39 California counties WellCensus profiles by well count and holds 0.5% of the state's 242,471 catalogued wells.
Catalogued wells
1,250
Active
101
Plugged
997
Documented orphans
12
What is the status of oil and gas wells in San Joaquin County?
8% of San Joaquin County's wells are active, 14 percentage points below the California share of 22%. 80% are plugged & abandoned, against 60% statewide and 48% nationally. 115 wells (9%) are shut-in — unplugged but idle. 12 wells (1.0%) are documented orphans with no operator able to plug them, compared with 1% across California and 4% nationally. The remaining 25 carry status codes outside those classes, such as permitted or cancelled locations.
What kinds of wells are in San Joaquin County?
By product class, 5 of the county's wells (0.4%) are oil wells, 409 (33%) gas wells and 7 (0.6%) injection wells. Statewide the oil share is 68% and the gas share 3%. 100% of the county's wells carry coordinates and appear on the map.
How does San Joaquin County compare with other California counties?
San Joaquin County has the 15th-most catalogued wells of the 39 California counties with at least 25. The median California county on WellCensus has 675 wells. The largest, Kern County, has 156,849. By documented orphans it ranks 16th in California.
Who operates wells in San Joaquin County?
239 distinct operators of record are linked to wells in San Joaquin County. 100% of the county's wells carry a link to a canonical operator profile; the rest list no operator or a name not yet resolved. Each well's page names its operator where the state publishes one.
Wells in San Joaquin County
🔒 Create a free account to export CSV| Well | API # / state ID | Status | Type | Operator |
|---|---|---|---|---|
| Allied Properties et al 1 | 04-077-00001 | Plugged & abandoned | Other type | UMC Petroleum Corp. |
| Mobil Parcel Y 1 | 04-077-00316 | Plugged & abandoned | Other type | Occidental Petroleum Corporation |
| KCY-Irwin 1 | 04-077-00317 | Plugged & abandoned | Other type | Arco Western Energy Co. |
| Manteca Unit 26-3 | 04-077-00332 | Plugged & abandoned | Other type | H. W. Reynolds, Jr. |
| Schleiss 1 | 04-077-00333 | Plugged & abandoned | Other type | Christiana Oil Corp. |
| Great Basins Unit 33-2 | 04-077-00334 | Plugged & abandoned | Other type | H. W. Reynolds, Jr. |
| Stratigraphic Test 1 | 04-077-00336 | Plugged & abandoned | Other type | Shell Western E&P Inc. |
| Weaver-Cordes 1 | 04-077-00337 | Plugged & abandoned | Other type | Richard S. Rheem, Operator |
| Daisy 1 | 04-077-00338 | Plugged & abandoned | Other type | Annie Fabian |
| Signal-L.O.F.-Best 1 | 04-077-00354 | Plugged & abandoned | Other type | Phillips Petroleum Company |
| Dell 'Osso 26X-4 | 04-077-00355 | Plugged & abandoned | Other type | Great Basins Petroleum Co. |
| Great Basins-R.I.L. 1 | 04-077-00356 | Plugged & abandoned | Other type | Chevron U.S.A. Inc. |
| Paradise Cut Unit A 1 | 04-077-00357 | Plugged & abandoned | Other type | Occidental Petroleum Corporation |
| Fitzsimmons 88-19 | 04-077-00359 | Plugged & abandoned | Other type | Great Basins Petroleum Co. |
| Occidental-K.C.R. 72-27 | 04-077-00360 | Plugged & abandoned | Other type | Great Basins Petroleum Co. |
| Everett 1-21 | 04-077-00361 | Plugged & abandoned | Other type | Great Basins Petroleum Co. |
| Crittenden 63-X | 04-077-00367 | Plugged & abandoned | Other type | Empire State Oil Co. |
| G.B.-Clevenger-Frazier 1 | 04-077-00368 | Plugged & abandoned | Other type | Occidental Petroleum Corporation |
| Great Basins-Lefler 1 | 04-077-00369 | Plugged & abandoned | Other type | Chevron U.S.A. Inc. |
| Holloway 76-6 | 04-077-00370 | Plugged & abandoned | Other type | Great Basins Petroleum Co. |
| M.J. Oliveaira et ux 1 | 04-077-00371 | Plugged & abandoned | Other type | Exxon Mobil Corporation |
| Antonini 1 | 04-077-00372 | Plugged & abandoned | Other type | Christiana Oil Corp. |
| Boer 1 | 04-077-00374 | Plugged & abandoned | Other type | Great Basins Petroleum Co. |
| Great Basins-Wilson 1 | 04-077-00378 | Plugged & abandoned | Other type | Great Basins Petroleum Co. |
| Elmer J. Freethy et ux 1 | 04-077-00379 | Plugged & abandoned | Other type | Exxon Mobil Corporation |
A sample of the county’s wells — every catalogued well has its own page. Browse all 1,250 in search → (filter by operator, status and type, then export), or find a specific well on the live map.
Frequently asked questions
How many oil and gas wells are in San Joaquin County, CA?
San Joaquin County, California has 1,250 catalogued oil & gas wells: 101 active, 997 plugged and 12 documented orphans.
How many orphaned wells are in San Joaquin County?
12 wells in San Joaquin County, California are documented orphans — unplugged with no solvent operator of record, the 16th-highest count among California counties.
What share of wells in San Joaquin County are plugged?
997 of San Joaquin County's 1,250 catalogued wells (80%) are plugged & abandoned, compared with 60% across California.
Which California county has the most oil and gas wells?
Kern County has the most catalogued wells of any California county on WellCensus (156,849); San Joaquin County ranks 15th with 1,250.
How many companies operate wells in San Joaquin County?
239 distinct operators of record are linked to catalogued wells in San Joaquin County, California.
Nearby in the California rankings
About this data
Source: CalGEM WellSTAR well registry, plus the USGS United States Documented Orphaned Well Database (2026, doi 10.5066/P13FHBYG), as published October 28, 2026 — WellCensus refreshes it monthly. See the methodology for how records are matched, cleaned and scored.
Cite as: WellCensus, “Oil & gas wells in San Joaquin County, California”, https://wellcensus.com/wells/california/san-joaquin (data as of October 28, 2026).