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Truck Graph
95/100
✗ Do Not Tender
OOS rate 64.3% is critically above the national average.
Castle Oilfield Services
DOT 2496282 · MC MC1376430 · Williston, ND
Report generated: June 3, 2026 at 7:30 AM
✓Authorized for hire?
✓Active insurance?
✗Safety record clean?
✓No fraud flags?
✓No prior revocations?
Carrier Summary

Castle Oilfield Services (DOT 2496282, MC MC1376430) is a North Dakota-based interstate carrier headquartered in Williston, ND. As of June 3, 2026 at 7:30 AM, operating authority is currently active. TruckGraph has detected 5 risk signals on this carrier, including: elevated driver out-of-service rate; elevated vehicle out-of-service rate. TruckGraph rates this carrier "Do Not Tender" based on FMCSA compliance data, inspection history, insurance status, and network connection analysis. Last synced: June 3, 2026 at 7:30 AM.

Common Authority
FMCSA Public Record
Cos LLC
Operating as: Castle Oilfield Services
DOT Number2496282
MC NumberMC1376430
Street501 48TH AVE W
City / StateWilliston, ND 58801
Phone7015721832
Operation typeInterstate
HazmatNot authorized
Authority age12 yr 1 mo
MCS-150 filed01/29/2026
Company officerPenny Brown
Power units20
Total drivers19
Authority Status
Common (for-hire)✓ Active
Contract (for-hire)Not authorized
BrokerNot authorized
TruckGraph Intelligence
Risk Signals
●Elevated driver out-of-service rate
●Elevated vehicle out-of-service rate
●Unsafe driving violation on record
●Driver qualification violation on record
●Driver fitness alert in FMCSA safety data
✓ OFAC Sanctions: Clear
Connection Chain
Active
Active
OOS rate 64.3% vs. national avg 22.26% — above average
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Power Units
20
Fleet
Drivers
19
Total
Inspections
14
On record
Crashes
0
On record
OOS Rate
64.3%
↑ Avg 22.26%
Authority Age
12 yr 1 mo
Since 2014
Violation Categories — Last 24 Months
Hours of Service
14 insp (100%)· 3 viol
Unsafe Driving
14 insp (100%)· 3 viol
Driver Fitness
14 insp (100%)· 7 viol
Controlled Substances
14 insp (100%)
Vehicle Maintenance
11 insp (79%)· 9 viol
Inspection History
14 total · OOS rate 64.3%
DateStateLevelDriver OOSVehicle OOSResult
7/26/2024NDII00Pass
6/24/2024MTII01OOS
2/24/2025NDIII00Pass
8/22/2024SDIII10OOS
5/16/2024NDII01OOS
8/14/2024NDII00Pass
1/10/2025NDII00Pass
7/9/2024TXII12OOS
4/9/2025NDII00Pass
6/3/2024NDI01OOS
Crash History
0 total on record

No crash records on file.

Insurance Status
Status
✓ Active filing on record
Insurer
BERKLEY REGIONAL INSURANCE COMPANY
Coverage type
91X
Coverage amount
$1,000,000
Effective
3/4/2022
Location
501 48TH AVE W, Williston, ND, 58801 · Open in Maps →
501 48TH AVE W, WILLISTON, ND, 58801Open in Maps →
Authority Timeline
Authority GrantedApr 2014
FMCSA issued operating authority
ActiveCurrent
Authority currently active

Source: FMCSA compliance records, inspection data, crash records, insurance filings, and TruckGraph analysis. View methodology

Important Legal Notice

Data sourced from FMCSA public records and TruckGraph independent analysis. This is not legal advice, not a guarantee of carrier safety, and not a compliance certification. Verify through official FMCSA sources before tendering. Last synced: .

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Frequently Asked Questions

Is Cos LLC authorized to operate?

Yes. Cos LLC holds Common operating authority and is currently active.

What is Cos LLC's safety record?

Cos LLC has 14 roadside inspections on record with an out-of-service rate of 64.3%. Crash history shows 0 incidents. Review the full safety profile above before making a freight decision.

How many trucks does Cos LLC operate?

Cos LLC operates 20 power units with approximately 19 drivers.

Is Cos LLC insured?

Cos LLC has active insurance coverage on file. Coverage amount and carrier details are shown in the insurance section above.

Has Cos LLC had any risk indicators?

Cos LLC has a risk score of 95/100 (Critical) with 5 active risk signals. Review the risk section above and verify independently before tendering.

What is the DOT number for Cos LLC?

Cos LLC's DOT number is 2496282 and MC number is MC1376430. These identifiers are assigned by the FMCSA and can be used to look up this carrier in official compliance databases.

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Truck Graph data is open and citable. For press inquiries, contact our editorial team.

APA
Truck Graph. (2026). Castle Oilfield Services Safety Record, DOT 2496282. Retrieved from https://truckgraph.com/carriers/2496282
MLA
"Castle Oilfield Services Safety Record, DOT 2496282." Truck Graph, Jun 3, 2026, https://truckgraph.com/carriers/2496282
Chicago
"Castle Oilfield Services Safety Record, DOT 2496282." Truck Graph. Last modified June 3, 2026. https://truckgraph.com/carriers/2496282