328 wells across 136 active operators, with 16 drilling permits filed in the last 24 months.
Refreshed monthly from CalGEM well-header records. Data current as of 2026-08-16.
Quick answer: The Northern Coast Range Prov formation in California has 328 wells on record across 136 active operators, with 16 drilling permits filed in the last 24 months (as of 2026-08-16). Its most active operators by well count are Chevron, Patriot Resources, Sargent Oil Company, H W Covert and E & B Natural Resources Management. Compiled from California Geologic Energy Management Division (CalGEM) well-header records, refreshed monthly.
The operators with the most well counts targeting the Northern Coast Range Prov formation in California:
| # | Operator | Wells in Northern Coast Range Prov |
|---|---|---|
| 1 | Chevron | 35 |
| 2 | Patriot Resources | 21 |
| 3 | Sargent Oil Company | 20 |
| 4 | H W Covert | 14 |
| 5 | E & B Natural Resources Management | 12 |
| 6 | Petaluma Oil & Gas Development Company | 11 |
| 7 | Hershey Oil | 9 |
| 8 | Mobil Oil | 8 |
| 9 | E C Brown Operator | 7 |
| 10 | Shell Oil Company | 7 |
The California counties with the most Northern Coast Range Prov activity:
Santa Clara, Alameda, Sonoma, Napa, Mendocino
The most recent 1 drilling permits filed for Northern Coast Range Prov wells in California:
| Permit Date | Well | API | County | Operator | Lateral (ft) |
|---|---|---|---|---|---|
| 2025-12-04 | Gulf-James W. Rea, Jr. Et Al 2 | 04085200070000 |
Santa Clara | Patriot Resources | 177 |
The Northern Coast Range Prov is one of California's active oil and gas plays, with 328 wells on file across 136 distinct operators of record. Operators have filed 16 drilling permits targeting the Northern Coast Range Prov in the last 24 months — a measure of how active the play is right now versus its historical baseline.
For mineral owners with interests in Santa Clara, Alameda, Sonoma, Napa, Mendocino, knowing whether your tract sits within an active Northern Coast Range Prov footprint is a foundational valuation question. Active formations with consistent permit flow command premium pricing; legacy formations with steady but declining production are valued differently.
See all California oil & gas formations & plays · Download the California formations dataset (CSV)
328 wells target the Northern Coast Range Prov in California, worked by 136 active operators, per CalGEM well-header records (as of 2026-08-16).
By well count, the most active Northern Coast Range Prov operators in California are Chevron, Patriot Resources, Sargent Oil Company, H W Covert and E & B Natural Resources Management. The full ranking is in the table on this page.
Operators filed 16 drilling permits targeting the Northern Coast Range Prov in the last 24 months — a live measure of current activity, per CalGEM records.
Operators filed 16 new drilling permits targeting the Northern Coast Range Prov in California over the last 24 months. New permits and spuds are the clearest signal of active Northern Coast Range Prov drilling, per CalGEM records (as of 2026-08-16).
Northern Coast Range Prov activity in California currently spans 328 wells on record and 136 active operators, led by Chevron, Patriot Resources, Sargent Oil Company, H W Covert and E & B Natural Resources Management, with 16 drilling permits filed in the last 24 months — refreshed monthly from California Geologic Energy Management Division (CalGEM) well-header records (as of 2026-08-16).
The most active Northern Coast Range Prov counties in California are Santa Clara, Alameda, Sonoma, Napa, Mendocino.
Value depends on your net mineral acres or royalty decimal, the operator, the remaining drilling locations, and current oil and gas prices. Buckhead Energy checks your tract against current Northern Coast Range Prov well and permit data and puts a free, no-obligation written offer in writing — this page is informational only, not a valuation.
Cite this dataset
Permanently archived and citable via a DOI on Zenodo (CERN), under a CC BY 4.0 license. DOI: 10.5281/zenodo.21442884 · View on Zenodo
License & attribution: This data is licensed CC BY 4.0. You are free to share and adapt it, including commercially, provided you credit “Buckhead Energy” and link back to this page or the DOI above.
Get a free written offer based on your specific tract, operator, and the current Northern Coast Range Prov activity in your area.
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Formation: Northern Coast Range Prov
State: California
Total wells: 328
Active operators: 136
Permits 24mo: 16
Last refresh: 2026-08-16
Free written offers on Northern Coast Range Prov mineral rights in California.
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