Oil & gas wells in Stanislaus County, CA
153 catalogued wells in Stanislaus County, California, from the state regulator registry and the federal orphaned-well inventory.
Dataset updated . Derived from public data sources.
At a glance
Stanislaus County, California has 153 catalogued oil & gas wells: 1 active (0.7%), 139 plugged & abandoned (91%) and 5 documented orphans. It ranks 32nd of the 39 California counties WellCensus profiles by well count and holds 0.1% of the state's 242,471 catalogued wells.
Catalogued wells
153
Active
1
Plugged
139
Documented orphans
5
What is the status of oil and gas wells in Stanislaus County?
0.7% of Stanislaus County's wells are active, 22 percentage points below the California share of 22%. 91% are plugged & abandoned, against 60% statewide and 47% nationally. 2 wells (1%) are shut-in — unplugged but idle. 5 wells (3%) are documented orphans with no operator able to plug them, compared with 1% across California and 4% nationally. The remaining 6 carry status codes outside those classes, such as permitted or cancelled locations.
What kinds of wells are in Stanislaus County?
By product class, 4 of the county's wells (3%) are oil wells, 12 (8%) gas wells and 0 (0%) 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 Stanislaus County compare with other California counties?
Stanislaus County has the 32nd-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 23rd in California.
Who operates wells in Stanislaus County?
89 distinct operators of record are linked to wells in Stanislaus 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 Stanislaus County
🔒 Create a free account to export CSV| Well | API # / state ID | Status | Type | Operator |
|---|---|---|---|---|
| Graham 1 | 04-099-00001 | Plugged & abandoned | Other type | Atlantic Richfield Co. |
| Isom 2 | 04-099-00002 | Plugged & abandoned | Other type | A & M Oil & Gas Co. |
| Lease by Santa Maria Petro. Corp. 1 | 04-099-00003 | Plugged & abandoned | Other type | Santa Maria Petro. Corp. |
| Lease by W. H. Clary 1 | 04-099-00004 | Orphaned | Other type | W. H. Clary |
| Skiles 1 | 04-099-00005 | Plugged & abandoned | Other type | Christiana Oil Corp. |
| Williams 1 | 04-099-00006 | Plugged & abandoned | Other type | Christiana Oil Corp. |
| Lease by Oakdale Oil Corp., Ltd. 1 | 04-099-00007 | Plugged & abandoned | Other type | Oakdale Oil Corp., Ltd. |
| Lease by Southern Oil & Gas Company 1 | 04-099-00008 | Plugged & abandoned | Other type | Southern Oil & Gas Company |
| Blewett Community 19 | 04-099-00009 | Plugged & abandoned | Other type | Chevron U.S.A. Inc. |
| Mape 1 | 04-099-00010 | Plugged & abandoned | Other type | E. E. Fogelson |
| E.T. Mape 1 | 04-099-00011 | Plugged & abandoned | Other type | Exxon Mobil Corporation |
| P.L. Davies et ux 1 | 04-099-00012 | Plugged & abandoned | Other type | Occidental Petroleum Corporation |
| Forni 1 | 04-099-00013 | Plugged & abandoned | Other type | Occidental Petroleum Corporation |
| SP Unit A 1 | 04-099-00014 | Plugged & abandoned | Other type | Occidental Petroleum Corporation |
| Caswell Park Unit 10-1 | 04-099-00015 | Plugged & abandoned | Other type | H. W. Reynolds, Jr. |
| Mape 1 | 04-099-00016 | Plugged & abandoned | Other type | Reynolds & Carver |
| Sesnon-Vernalis So Block Un. 1 47-31 | 04-099-00017 | Plugged & abandoned | Other type | Porter Sesnon et al |
| Sesnon-Vernalis So Block Un. 2 12-32 | 04-099-00018 | Plugged & abandoned | Other type | Porter Sesnon et al |
| Mape 1 | 04-099-00019 | Plugged & abandoned | Other type | Signet Operating & Expl. Co. |
| Overton 34-16 | 04-099-00020 | Plugged & abandoned | Other type | Chevron U.S.A. Inc. |
| Ambassador-Modesto Unit A-1 | 04-099-00021 | Plugged & abandoned | Other type | Great Basins Petroleum Co. |
| Caswell Unit 1 | 04-099-00022 | Plugged & abandoned | Other type | Great Basins Petroleum Co. |
| Coito 1 | 04-099-00023 | Plugged & abandoned | Other type | Great Basins Petroleum Co. |
| Wagner 35-26 | 04-099-00024 | Plugged & abandoned | Other type | Great Basins Petroleum Co. |
| Walker 1 | 04-099-00025 | Plugged & abandoned | Other type | Great Basins Petroleum Co. |
A sample of the county’s wells — every catalogued well has its own page. Browse all 153 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 Stanislaus County, CA?
Stanislaus County, California has 153 catalogued oil & gas wells: 1 active, 139 plugged and 5 documented orphans.
How many orphaned wells are in Stanislaus County?
5 wells in Stanislaus County, California are documented orphans — unplugged with no solvent operator of record, the 23rd-highest count among California counties.
What share of wells in Stanislaus County are plugged?
139 of Stanislaus County's 153 catalogued wells (91%) 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); Stanislaus County ranks 32nd with 153.
How many companies operate wells in Stanislaus County?
89 distinct operators of record are linked to catalogued wells in Stanislaus 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 10, 2026 — WellCensus refreshes it monthly. See the methodology for how records are matched, cleaned and scored.
Cite as: WellCensus, “Oil & gas wells in Stanislaus County, California”, https://wellcensus.com/wells/california/stanislaus (data as of October 10, 2026).