Costa Loma
Operator of record for 22 catalogued wells across 1 state. Every well below links to its full registry page.
At a glance
Costa Loma is the operator of record for 22 catalogued U.S. oil & gas wells in 1 state. None is listed as active, 0 (0%) are plugged & abandoned and 7 flagged as orphaned. Its largest concentration is in California, with 22 wells (100% of its portfolio).
Wells operated
22
Active
0
Plugged
0
Orphaned
7
Portfolio by state
| State | Wells |
|---|---|
| California | 22 |
Well mix
- Oil wells
- 21
- Gas wells
- 0
- Shut-in
- 3
- Active share
- 0%
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Claim Costa Loma to keep this portfolio accurate — verified operators can correct well statuses and add plugging documentation.
Claim your operator profileWhere does Costa Loma operate?
Costa Loma's catalogued wells are spread across 1 state: California (22). Its 22 California wells are 0.0% of the 242,471 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 Costa Loma’s wells are active, plugged or orphaned?
0% of Costa Loma's catalogued wells are active, 29 percentage points below the national share of 29%. 0% are plugged & abandoned, against 47% nationally. 3 wells (14%) are shut-in — unplugged but idle. 7 wells filed under this name are flagged as orphaned — unplugged, with no operator able to plug them.
What kinds of wells does Costa Loma operate?
By product class, 21 (95%) are oil wells and 0 (0%) gas wells; nationally the shares are 43% and 17%.
Notable wells operated by Costa Loma
| Well | API # / state ID | Status | Type | Location | Operator | Depth |
|---|---|---|---|---|---|---|
| Costa 5 | 04-081-20007 | Other status | Injection | San Mateo, CA | Costa Loma Ltd. | — |
| Reed 4 | 04-081-20040 | Other status | Oil | San Mateo, CA | Costa Loma Ltd. | — |
| Costa 3-A | 04-081-00079 | Orphaned | Oil | San Mateo, CA | Costa Loma Ltd. | — |
| Costa 5-A | 04-081-00080 | Orphaned | Oil | San Mateo, CA | Costa Loma Ltd. | — |
| Costa 2 | 04-081-00082 | Orphaned | Oil | San Mateo, CA | Costa Loma Ltd. | — |
| Costa 4-A | 04-081-20015 | Orphaned | Oil | San Mateo, CA | Costa Loma Ltd. | — |
| Costa 6-A | 04-081-20017 | Orphaned | Oil | San Mateo, CA | Costa Loma Ltd. | — |
| Reed 1 | 04-081-20021 | Orphaned | Oil | San Mateo, CA | Costa Loma Ltd. | — |
| Costa 8 | 04-081-20065 | Orphaned | Oil | San Mateo, CA | Costa Loma Ltd. | — |
| Costa 7-A | 04-081-20020 | Other status | Oil | San Mateo, CA | Costa Loma Ltd. | — |
| Reed 2 | 04-081-20018 | Other status | Oil | San Mateo, CA | Costa Loma Ltd. | — |
| Costa N.F.B. 1 | 04-081-20019 | Other status | Oil | San Mateo, CA | Costa Loma Ltd. | — |
Deepest first where depth is published. See all 22 wells →
Frequently asked questions
How many wells does Costa Loma operate?
Costa Loma is the operator of record for 22 catalogued oil & gas wells, with the largest concentration in California (22). Only wells in states WellCensus has ingested are counted.
How many of Costa Loma's wells are still active?
0 of Costa Loma's catalogued wells are active; 0 are plugged & abandoned and 7 are flagged as orphaned.
In which states does Costa Loma operate wells?
Costa Loma is the operator of record for wells in California (22).
Does Costa Loma operate mostly oil or gas wells?
21 of Costa Loma's catalogued wells are oil wells and 0 are gas wells; the rest are injection, service or unclassified wells.
Where Costa Loma'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, “Costa Loma — well portfolio”, https://wellcensus.com/operators/costa-loma-3805 (data as of October 10, 2026).
Dataset updated . Operator portfolios are resolved from raw state registry filings (exact-normalized names; subsidiaries stay separate).