DBA: Castle Oilfield Services
Cos Llc is an active interstate carrier based in Williston, ND.
No insurance filings on record.
View on FMCSA L&I| Vehicle Type | Owned | Term Leased | Trip Leased |
|---|---|---|---|
| Straight Trucks | 17 | 0 | 0 |
| Tractors | 3 | 0 | 0 |
| Total Power Units | 20 | ||
Distinct vehicles · 24 mo
vs 20 self-reported (MCS-150)
Top makes
Registered in
Higher values = more violations. 0 = clean record.
| Category |
|---|
| Category | vs. Cohort | vs. State | Reading |
|---|---|---|---|
| Unsafe Driving | 83% | 91% | Worse than most peers |
| HOS Compliance | 95% | 97% | Worse than most peers |
| Driver Fitness | 97% | 97% | Worse than most peers |
| Controlled Substances | 0% | 0% | Better than most peers |
| Vehicle Maintenance | 86% | 93% | Worse than most peers |
Lower percentile = lower SMS measure = stronger safety record. Computed nightly across active carriers in the same state and fleet-size band.
| Type | Inspections | OOS | OOS % | Nat'l Avg |
|---|---|---|---|---|
| Driver | 0 | 5 | — | 6.67% |
| Vehicle | 0 | 14 | — | 22.26% |
| Hazmat | 0 | 0 | — |
| Period | Fatalities | Injuries | Tow-away | Total |
|---|---|---|---|---|
| Oct 1, 2025 | 0 | 1 | 1 | 1 |
Most-cited violation codes
| BASIC Category | Total | Severe | OOS |
|---|---|---|---|
| Vehicle Maintenance | 55 |
| Date | State | Vehicle | Violations | OOS |
|---|---|---|---|---|
| Apr 9, 2025 | ND | STRAIGHT TRUCK | 2 | 0 |
| Feb 24, 2025 | ND | STRAIGHT TRUCK | 0 | 0 |
| Feb 1, 2025 | WY | STRAIGHT TRUCK | 20 | 9 |
| Feb 1, 2025 | WY | STRAIGHT TRUCK | 8 | 4 |
Carriers that share an officer, phone, or email with this DOT.
Shared officer · 6
Countryside Transport Llc
Chesapeake City, MD
Penny Brown · also at 6 others
Gerald Brown
Crittenden, KY
Penny Brown · also at 6 others
H 4 Trucking Llc
Folsom, NM
Penny Brown · also at 6 others
Mosby Mechanical Co Inc
Longview, TX
Penny Brown · also at 6 others
P M Trucking Llc
Staunton, VA
Penny Brown · also at 6 others
| Insp w/ Viol |
|---|
| Measure |
|---|
| Alert |
|---|
| Unsafe Driving | 3 | 0.86 | — |
| HOS Compliance | 3 | 1.50 | — |
| Vehicle Maintenance | 7 | 18.54 | — |
| Driver Fitness | 6 | 2.64 | Alert |
| Controlled Substances | 0 | 0.00 | — |
| 4.44% |
Where they run
Inspected in 5 states. Top state ND accounts for 60% of activity. Activity outside home state (ND): 40%.
| 9 |
| 19 |
| Driver Fitness | 8 | 3 | 4 |
| Hours-of-Service Compliance | 3 | 0 | 3 |
| Unsafe Driving | 3 | 0 | 0 |
| Feb 1, 2025 | WY | STRAIGHT TRUCK | 11 | 5 |
| Jan 10, 2025 | ND | STRAIGHT TRUCK | 2 | 0 |
| Dec 3, 2024 | ND | STRAIGHT TRUCK | 1 | 1 |
| Aug 22, 2024 | SD | OTHER | 1 | 1 |
| Aug 14, 2024 | ND | STRAIGHT TRUCK | 0 | 0 |
| Jul 26, 2024 | ND | STRAIGHT TRUCK | 1 | 0 |
| Date | Code | Description | BASIC | OOS |
|---|---|---|---|---|
| Apr 9, 2025 | 3939AHLLH | Lighting - Headlamp(s) fail to operate on low and high beam | Vehicle Maintenance | — |
| Apr 9, 2025 | 3939ALIL | Lighting - Identification lamp(s) inoperative | Vehicle Maintenance | — |
| Feb 1, 2025 | 38323A2LCDLN | License (CDL) - Operate a CMV and does not possess a valid CDL | Driver Fitness | Yes |
| Feb 1, 2025 | 39141AMCPC | Medical (Certificate) - Operating a commercial vehicle without showing proof of a valid medical certification upon request when medical certification is required. | Driver Fitness | — |
| Feb 1, 2025 | 3922SLLTCD | State/Local Laws - Failed to obey a traffic control device - Permanent or Temporary - e.g. safety official signal sign light lane marking other | Unsafe Driving | — |
| Feb 1, 2025 | 3929A2C | Cargo - Vehicle components or dunnage not secured | Vehicle Maintenance | Yes |
| Feb 1, 2025 | 393201AFRCLS | Frame - Cracked/loose/sagging/broken frame or chassis | Vehicle Maintenance | — |
| Feb 1, 2025 | 393209DSTGBL | Steering - Gear box mounting bolt loose | Vehicle Maintenance | Yes |
| Feb 1, 2025 | 39345DB | Air Brake - Audible air leak at a proper connection | Vehicle Maintenance | — |
| Feb 1, 2025 | 39375GTAOW | Tires - All others weight carried exceeds tire load limit | Vehicle Maintenance | Yes |
William Brown
Dearing, GA
Penny Brown · also at 6 others
Shared phone · 1