COS LLC

DBA: CASTLE OILFIELD SERVICES

DOT# 2496282 MC# 1376430CARRIER

ACTIVE

Trust Score

77 / 100

C Fair

Components

Compliance · 40% 100

Safety · 35% 45

Insurance · 25% 85

Vehicle OOS rate is 2.5× the national average Driver OOS rate is 8.1× the national average No active cargo insurance on file

Confidence: high · based on FMCSA safety, insurance & authority data How is this calculated?

Overview

Address

Physical

501 48TH AVE W

WILLISTON, ND 58801

View on Google Maps ↗

Mailing

PO BOX 1472

WILLISTON, ND 58802

Contact

Phone: (701) 572-1832

Email: CASTLEOIL.BOOKKEEPING@GMAIL.COM

Company Officers

PENNY BROWN

Business Info

Fleet

Power Units

Drivers

Equipment Breakdown

Owned Trucks17

Owned Tractors3

Authority

Status: ACTIVE

FMCSA add date: Apr 16, 2014

Common authority: Mar 16, 2022

Authority History (1)

Authority Type	Action	Date
MOTOR PROPERTY COMMON CARRIER	GRANTED	Mar 16, 2022

Cargo Types

Liquids/GasesOilfield Equipment

Active Certifications

Property

MCS-150

Last updated: Jan 29, 2026

Mileage: 251,164 (2025)

Operation Classification

AUTHORIZED FOR HIRE

Carrier Operation

Interstate

Related Companies

Company	DOT#	MC#	Location	Status	Linked By
STATELINE SERVICES INC	2136935	744028	WILLISTON, ND	ACTIVE	AddressPhone
COUNTRYSIDE TRANSPORT LLC	2447933	844833	CHESAPEAKE CITY, MD	INACTIVE	Officer
H 4 TRUCKING LLC	2074283	744372	FOLSOM, NM	INACTIVE	Officer
P M TRUCKING LLC	1320942	511161	STAUNTON, VA	INACTIVE	Officer
WILLIAM BROWN DBA: BROWN TRUCKING	1157824	471842	DEARING, GA	INACTIVE	Officer

Recent Changes

Safetytotal crashes: 4 → 3Jul 30, 2026

Safetydriver oos rate: 57.142857 → 50Jul 29, 2026

Safetytotal crashes: 3 → 4Jun 7, 2026

Safetytotal crashes: 2 → 3Apr 27, 2026

Safety

Out-of-Service Rates

Driver10 inspections

50.0%

6.2%

Carrier National avg

Vehicle7 inspections

57.1%

22.8%

Carrier National avg

Hazmat

No hazmat inspections

Overall10 inspections

60.0%

Carrier

Crash Summary

Fatal

Injury

3.0

per 1M miles

Towaway

Total

BASIC Violations

Unsafe Driving17

Driver Fitness6

Hours of Service3

Drug / Alcohol0

Vehicle Maintenance54

Safety Measurement System (SMS)

FMCSA's official per-BASIC roadside-performance measures over the trailing 24 months, computed from the 12 inspections below. A measure of 0 means no recorded violations in that BASIC — not necessarily a strong safety record on a small sample. FMCSA does not publish peer-group percentiles for property carriers, so the underlying measures — not percentile rankings — are shown; Hazmat Compliance and Crash Indicator are not published.

SMS Inspections (24 mo)

Total

Driver OOS

Vehicle OOS

BASIC Measures

Unsafe Driving0.863 insp w/ viol

Hours of Service1.503 insp w/ viol

Driver Fitness Acute/Critical 2.646 insp w/ viol

Controlled Substances0.000 insp w/ viol

Vehicle Maintenance18.547 insp w/ viol

Insurance

$1,000,000

BIPD Coverage

—

Cargo Coverage

1 policy on file1 active

Type	Status	Insurer	Policy #	Coverage	Effective	Expires	Form
BIPD	Active	BERKLEY REGIONAL INSURANCE COMPANY	ECA3150008-13	$1,000,000	Mar 4, 2022	—	91X

Get this data via API

API Reference

curl https://api.dotlookup.dev/v1/carriers/2496282