Sierra County has 31 wells in the OCD well file — 0 of them producing today (0 oil, 0 gas), 0 permitted, 0 spudded but not yet completed, and 31 plugged and abandoned. The most active operator by well count is Pre-Ongard Well Operator. Figures come from the 2026-09-29 OCD bulk file; production runs through 2026-08.
| Operator | Wells |
|---|---|
| Pre-Ongard Well Operator | 30 |
| Shell Oil Co | 1 |
| Field | Wells |
|---|---|
| Wc | 1 |