STARR County
District 4 · Gulf Coast (Southwest) · Permits since 1977-06-02 · Data through 2026-04-23
Starr County has had no new drilling permits in the past 90 days; the most recent permit on record was issued 2026-04-23. KILLAM OIL CO., LTD. leads with 3 permits in the past 12 months, one of 5 operators active in the county. 3 operators filed a first Starr County permit in the past year. Median permitted depth over the past year is 5,218 ft (prior year: 6,690 ft); 0% of the past year's permits are horizontal.
Permits (1yr)
8
vs Prior
+14%
Operators (1yr)
5
Avg Depth (1yr)
6,156
Hz % (1yr)
0%
All Time
7,111
Depth Range: 129 - 21,000 ft
SWD wells in STARR County → 49 active injection & disposal wells · full UIC inventory
Permit Activity
Permit Types (1yr)
RECOMP
4
-2 vs prior
DRILL
4
NEW vs prior
Top Operators
by permits, trailing 12 mo View All
| OPERATOR | PERMITS 12MO | WELLS |
|---|---|---|
| KILLAM OIL CO., LTD. | 3 | 98 |
| MUELLER EXPLORATION, INC. | 2 | 2 |
| PETROVYBE OPCO LLC | 1 | 74 |
| TRIAD O&G, LLC | 1 | 5 |
| ILEX ENERGY CORPORATION | 1 | 0 |
Recent Permits
View All| PERMIT | LEASE | TYPE | ISSUED |
|---|---|---|---|
| 915027 | RICHMOND | DRILL | 2026-04-23 |
| 914356 | MONTALVO, N. R. | RECOMP | 2026-03-27 |
| 913943 | BROCK | DRILL | 2026-03-10 |
| 913510 | I.V. MONTALVO 'A' | RECOMP | 2026-02-20 |
| 912483 | ALBERTO ALANIZ | DRILL | 2026-01-05 |
| 911186 | I.V. MONTALVO 'C' | RECOMP | 2025-10-20 |
| 911185 | I.V. MONTALVO 'C' | RECOMP | 2025-10-20 |
| 910180 | ALBERTO ALANIZ | DRILL | 2025-09-02 |
| 907671 | HALL, J. F. STATE | RECOMP | 2025-05-01 |
| 906366 | MONTALVO, N. R. | RECOMP | 2025-03-07 |
New to STARR County
first county permit, past 12 mo| OPERATOR | FIRST PERMIT | PERMITS | BACKGROUND |
|---|---|---|---|
| MUELLER EXPLORATION, INC. | 2025-09-02 | 2 | active elsewhere in TX |
| PETROVYBE OPCO LLC | 2026-04-23 | 1 | active elsewhere in TX |
| ILEX ENERGY CORPORATION | 2026-03-10 | 1 | first TX permits |
Formations Beneath STARR County
from RRC completion filings| FORMATION | WELLS | MEDIAN TOP (FT) |
|---|---|---|
| Vicksburg | 1,027 | 7,006 |
| Frio | 573 | 3,953 |
| Queen City | 261 | 4,235 |
| Yegua | 145 | 4,115 |
| Catahoula | 110 | 2,985 |
| Miocene (undifferentiated) | 86 | 1,000 |
| Reklaw | 80 | 5,474 |
| Wilcox | 74 | 6,722 |