California Oil
Operator of record for 48 catalogued wells across 4 states. Every well below links to its full registry page.
Filed as: CALIFORNIA OIL COMPANY · California Oil Co · California Oil Co.
At a glance
California Oil is the operator of record for 48 catalogued U.S. oil & gas wells in 4 states. None is listed as active, 48 (100%) are plugged & abandoned. Its largest concentration is in California, with 30 wells (63% of its portfolio).
Wells operated
48
Active
0
Plugged
48
Orphaned
0
Portfolio by state
| State | Wells |
|---|---|
| California | 30 |
| Utah | 12 |
| Colorado | 5 |
| Montana | 1 |
Well mix
- Oil wells
- 36
- Gas wells
- 0
- Shut-in
- 0
- Active share
- 0%
Is this your company?
Claim California Oil to keep this portfolio accurate — verified operators can correct well statuses and add plugging documentation.
Claim your operator profileWhere does California Oil operate?
California Oil's catalogued wells are spread across 4 states: California (30), Utah (12), Colorado (5) and Montana (1). Its 12 Utah wells are 0.0% of the 40,139 catalogued in that state — its largest share of any state. Counts cover only states whose registries WellCensus has ingested with operator names; wells in Nebraska and Texas (location indexes) and in states without a registry ingest are not yet attributed to any operator.
How many of California Oil’s wells are active, plugged or orphaned?
0% of California Oil's catalogued wells are active, 29 percentage points below the national share of 29%. 100% are plugged & abandoned, against 47% nationally. None of the wells filed under this name is flagged as orphaned.
What kinds of wells does California Oil operate?
By product class, 36 (75%) are oil wells and 0 (0%) gas wells; nationally the shares are 43% and 17%. The deepest of its wells with a published depth is 1 Lloyd J Mumm in Yuma, CO at 6,532 ft. The wells listed below sit in Yuma (CO), Toole (MT), Montezuma (CO), Rio Blanco (CO), Santa Barbara (CA) and Los Angeles (CA) and other counties. State filings spell the name 3 ways; WellCensus merges exact-normalized spellings only, so subsidiaries and affiliates keep their own pages.
Notable wells operated by California Oil
| Well | API # / state ID | Status | Type | Location | Operator | Depth |
|---|---|---|---|---|---|---|
| 1 Lloyd J Mumm | 05-125-05227 | Plugged & abandoned | Other type | Yuma, CO | California Oil Company | 6,532 ft |
| Lincoln 1 | 25-101-11522 | Plugged & abandoned | Oil | Toole, MT | California Oil Co. | 2,100 ft |
| 10 C R C Strat | 05-083-05130 | Plugged & abandoned | Other type | Montezuma, CO | California Oil Company | 450 ft |
| 2 C R C Strat | 05-083-05128 | Plugged & abandoned | Other type | Montezuma, CO | California Oil Company | 450 ft |
| 1 C R C Strat | 05-083-05132 | Plugged & abandoned | Other type | Montezuma, CO | California Oil Company | 450 ft |
| 1 Gov C-062118-A | 05-103-05831 | Plugged & abandoned | Other type | Rio Blanco, CO | California Oil Company | 0 ft |
| Lease by California Oil Co. D | 04-083-04611 | Plugged & abandoned | Oil | Santa Barbara, CA | California Oil Co. | — |
| Well No. 1 | 04-037-12958 | Plugged & abandoned | Oil | Los Angeles, CA | California Oil Co. | — |
| Titus 2 | 04-079-21076 | Plugged & abandoned | Other type | San Luis Obispo, CA | California Oil Co. | — |
| Lease by California Oil Co. M | 04-083-04623 | Plugged & abandoned | Oil | Santa Barbara, CA | California Oil Co. | — |
| Lease by California Oil Co. K | 04-083-04621 | Plugged & abandoned | Oil | Santa Barbara, CA | California Oil Co. | — |
| Unknown A A | 04-083-04615 | Plugged & abandoned | Oil | Santa Barbara, CA | California Oil Co. | — |
Deepest first where depth is published. See all 48 wells →
Frequently asked questions
How many wells does California Oil operate?
California Oil is the operator of record for 48 catalogued oil & gas wells, with the largest concentration in California (30). Only wells in states WellCensus has ingested are counted.
How many of California Oil's wells are still active?
0 of California Oil's catalogued wells are active; 48 are plugged & abandoned.
In which states does California Oil operate wells?
California Oil is the operator of record for wells in California (30), Utah (12), Colorado (5) and Montana (1).
Does California Oil operate mostly oil or gas wells?
36 of California Oil's catalogued wells are oil wells and 0 are gas wells; the rest are injection, service or unclassified wells.
What is California Oil's deepest well?
Among wells with a published depth, 1 Lloyd J Mumm in Yuma, CO is the deepest at 6,532 ft.
Where California Oil's wells are
About this data
Source: State oil & gas regulator registries (operator of record as filed, exact-normalized across states) plus the USGS United States Documented Orphaned Well Database (2026), as published October 10, 2026 — WellCensus refreshes it monthly. See the methodology for how records are matched, cleaned and scored.
Cite as: WellCensus, “California Oil — well portfolio”, https://wellcensus.com/operators/california-oil-3319 (data as of October 10, 2026).
Dataset updated . Operator portfolios are resolved from raw state registry filings (exact-normalized names; subsidiaries stay separate).