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USDOT 2496282MC-1376430Active

Castle Oilfield Services

Legal name: Cos LLC

Castle Oilfield Services's DOT number is USDOT 2496282, MC number MC-1376430.

Needs attention

1 item to check

Based in

Williston, ND

Power units

20

Drivers

19

Operation

Interstate

Watch Castle Oilfield Services for free

Next MCS-150 due: Feb 29, 2028

We'll email a reminder before it's due, and the same day this carrier's operating status, authority, safety rating or roadside inspections change.

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Compliance check

From the FMCSA census and inspection files, checked Oct 19, 2026.

  • USDOT number status

    OK

    Active in the FMCSA census.

  • MCS-150 biennial update

    OK

    Next due Feb 29, 2028. Last filed Jan 29, 2026.

  • Operating authority (MC-1376430)

    OK

    Authority shows active.

  • Safety rating

    OK

    Satisfactory since Apr 3, 2026.

  • Out-of-service rate (24 months)

    Check

    Vehicle 66.7% vs 22.26% national, driver 50% vs 6.67% national, across 8 inspections.

  • UCR registration 2027

    Info

    Interstate carriers must register with UCR every year. 2027 registration is open now. Estimated fee for 20 power units: $333 (bracket 3).

Roadside inspections, last 24 months

TypeInspectionsOut of serviceOOS rateNational avg
Vehicle6466.7%22.26%
Driver8450%6.67%

8 inspections and 78 violations since Oct 19, 2024. Last inspection Apr 18, 2026. National averages are FMCSA-published approximations.

Registration details

Legal name
Cos LLC
DBA
Castle Oilfield Services
Classification
authorized for hire
CDL drivers
14
MCS-150 last filed
Jan 29, 2026
Reported mileage
251,164 (2025)
Added to FMCSA
Apr 16, 2014
Safety rating
Satisfactory

Source: FMCSA Motor Carrier Census and Vehicle Inspection File (data.transportation.gov), public records. Contact details are intentionally not shown. MyDotCheck is an independent service and is not affiliated with, endorsed by, or part of the U.S. Department of Transportation or FMCSA. Data comes from public FMCSA datasets and may lag official records by a day or more. Government filings can be made directly with FMCSA at no charge.