Robert Sumpf
Operator of record for 6 catalogued wells across 1 state. Every well below links to its full registry page.
At a glance
Robert Sumpf is the operator of record for 6 catalogued U.S. oil & gas wells in 1 state. None is listed as active, 6 (100%) are plugged & abandoned. Its largest concentration is in California, with 6 wells (100% of its portfolio).
Wells operated
6
Active
0
Plugged
6
Orphaned
0
Portfolio by state
| State | Wells |
|---|---|
| California | 6 |
Well mix
- Oil wells
- 0
- Gas wells
- 2
- Shut-in
- 0
- Active share
- 0%
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Claim your operator profileWhere does Robert Sumpf operate?
Robert Sumpf's catalogued wells are spread across 1 state: California (6). Its 6 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 Robert Sumpf’s wells are active, plugged or orphaned?
0% of Robert Sumpf'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 Robert Sumpf operate?
By product class, 0 (0%) are oil wells and 2 (33%) gas wells; nationally the shares are 43% and 17%. The wells listed below sit in Solano (CA), Contra Costa (CA) and Kings (CA).
Notable wells operated by Robert Sumpf
| Well | API # / state ID | Status | Type | Location | Operator | Depth |
|---|---|---|---|---|---|---|
| Fulmor 1 | 04-095-20751 | Plugged & abandoned | Other type | Solano, CA | Robert Sumpf | — |
| University Fulmor 1 | 04-095-20774 | Plugged & abandoned | Other type | Solano, CA | Robert Sumpf | — |
| Vaughn 1 | 04-095-20768 | Plugged & abandoned | Gas | Solano, CA | Robert Sumpf | — |
| Dal Porto-Shell 2 | 04-013-00175 | Plugged & abandoned | Other type | Contra Costa, CA | Robert Sumpf | — |
| U.S.L 1 | 04-031-20001 | Plugged & abandoned | Other type | Kings, CA | Robert Sumpf | — |
| Nishikawa 1 | 04-095-20761 | Plugged & abandoned | Gas | Solano, CA | Robert Sumpf | — |
Deepest first where depth is published. See all 6 wells →
Frequently asked questions
How many wells does Robert Sumpf operate?
Robert Sumpf is the operator of record for 6 catalogued oil & gas wells, with the largest concentration in California (6). Only wells in states WellCensus has ingested are counted.
How many of Robert Sumpf's wells are still active?
0 of Robert Sumpf's catalogued wells are active; 6 are plugged & abandoned.
In which states does Robert Sumpf operate wells?
Robert Sumpf is the operator of record for wells in California (6).
Does Robert Sumpf operate mostly oil or gas wells?
0 of Robert Sumpf's catalogued wells are oil wells and 2 are gas wells; the rest are injection, service or unclassified wells.
Where Robert Sumpf'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, “Robert Sumpf — well portfolio”, https://wellcensus.com/operators/robert-sumpf-5778 (data as of October 10, 2026).
Dataset updated . Operator portfolios are resolved from raw state registry filings (exact-normalized names; subsidiaries stay separate).