COS LLC
DBA: CASTLE OILFIELD SERVICES
ActiveNot RatedINTERSTATE
Based in WILLISTON, North Dakota, COS LLC is a motor carrier registered under USDOT 2496282. The company operates 20 power units and employs 19 drivers. Their vehicle out-of-service rate of 0.0% is below the national average of 20.7%, suggesting relatively well-maintained equipment. Our composite safety score rates this carrier at 70/100, indicating an above-average safety profile.
20
Power Units
19
Drivers
2496282
USDOT #
70/100
Safety Score
Company Details
- Legal Name
- COS LLC
- USDOT Number
- 2496282
- Entity Type
- CARRIER
- Address
- 501 48TH AVE W
WILLISTON, ND 58801 - Phone
- (701) 572-1832
- Carrier Operation
- Interstate
- Last MCS-150 Update
- January 29, 2026
Inspection Record
| Type | Total | OOS | Rate | Nat'l Avg |
|---|---|---|---|---|
| Vehicle | 1 | 0 | 0.0% | 20.7% |
| Driver | 1 | 0 | 0.0% | 5.5% |
| Hazmat | 0 | 0 | 0.0% | 4.5% |
Crash History
0
Fatal
0
Injury
1
Towaway
1
Total
Insurance
Insurer: BERKLEY REGIONAL INSURANCE COMPANY
- BIPD Liability
- $1.0M(req: $750K)OK
- Cargo
- N/A
- Bond/Surety
- N/A
BASICs Safety Scores
Unsafe Driving1.57%
Crash IndicatorN/A
HOS Compliance2%
Vehicle Maintenance17.43%
Controlled Substances0%
Hazmat ComplianceN/A
Driver Fitness2.33%
Higher percentile = worse safety performance. Scores above 75% may trigger FMCSA intervention.
Location
501 48TH AVE W, WILLISTON, ND 58801
Frequently Asked Questions
What is COS LLC's USDOT number?
COS LLC's USDOT number is 2496282. The company is based in WILLISTON, North Dakota.
Is COS LLC a safe trucking company?
COS LLC has not received a formal safety rating from FMCSA. The company has had 1 vehicle inspections with a 0.0% out-of-service rate (national average: 20.7%). They have 1 reportable crashes on record.
How many trucks does COS LLC have?
COS LLC operates 20 power units (trucks/commercial vehicles) and employs 19 drivers, according to their latest FMCSA filing.
Does COS LLC have adequate insurance?
COS LLC has $1.0M in BIPD liability insurance on file (meets the required $750K). Insured by BERKLEY REGIONAL INSURANCE COMPANY.
Source: FMCSA Safety and Fitness Electronic Records (SAFER) System