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COS LLC

Trust Score

Excellent Why this score?

Company CheckCOS LLC · DOT 2496282

DBA: CASTLE OILFIELD SERVICES

501 48TH AVE W, WILLISTON, ND, 58801

DOT# 2496282 MC# 1376430 Williston, North Dakota 4 years

CARRIER

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Power Units

Drivers

Crashes (24-Month)

$1,000,000

Insurance

Satisfactory

Safety Rating

Inspections

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Deep records on this carrier, only on LoadWrap

SMS BASIC Scores→ Safety & Inspections→ Licensing & Insurance→ Know Your Rights→ VIN Watch & CARB Check→ Get Change Alerts→

Public record

8 events tracked · latest Sep 8, 2026 ↓ Show details ↓

Safety & compliance 7

May 17, 2026
Crash reported (no fatalities).
Apr 18, 2026
Roadside inspection, 5 out-of-service violations.
Apr 15, 2026
Crash reported (no fatalities).
Nov 18, 2025
Crash reported (no fatalities).
Apr 9, 2025
Roadside inspection, 2 violations (no OOS).
Feb 24, 2025
Roadside inspection, 1 violation (no OOS).
Feb 1, 2025
Roadside inspection, 9 out-of-service violations.

Insurance 1

Current
Active insurance on file ($1,000,000).

Public FMCSA record · blue clean · orange change · red risk.

Contact Details

PhoneSign in to view

EmailSign in to view

Physical Address501 48TH AVE W, WILLISTON, ND, 58801

Mailing AddressPO BOX 1472, WILLISTON, ND, 58802

Other Companies at This Address

Address501 48TH AVE W, WILLISTON, ND 58801

Others here

Distinct phones

Active

Company	DOT	Phone	Status
COS LLC this company	2496282	Sign in	Active
STATELINE SERVICES INC	2136935	Sign in	Active

Note: sharing an address is legal and common (registered agents, virtual offices, business centers). A shared address never reduces the Trust Score.

Operating Authorities

Authority TypePRIVATE PROPERTY;AUTHORIZED FOR HIRE

Carrier OperationA - Interstate

DocketMC1376430

CommonActive

ContractNot Active

BrokerNot Active

Operating4 years

Operation Classification

Authorized For HirePrivate (Property)

SMS BASIC Scores

FMCSA safety categories, last 24 months. Above Cutoff = FMCSA flags a problem · Below cutoff = within limits · Clean = no violations.

Unsafe Driving

measure .86 · 3 insp with violations

Below cutoff

Hours-of-Service Compliance

measure 1.75 · 3 insp with violations

Below cutoff

Driver Fitness

measure 2.25 · 5 insp with violations

Above Cutoff

Controlled Substances / Alcohol

measure 0 · 0 insp with violations

Clean

Vehicle Maintenance

measure 20.11 · 5 insp with violations

Below cutoff

Source: FMCSA SMS, updated monthly.

Mileage

Annual Mileage201,996 miles

Mileage Year2022

VMT SourceMCS-150 Form

Drivers

Interstate

Intrastate

CDL

Total

Interstate >100mi0

Interstate <100mi0

Intrastate >100mi0

Intrastate <100mi0

Safety Summary

Safety RatingSatisfactory

Total Crashes (24-mo)4

Fatal0

Driver OOS46.2% avg 5.5%

Vehicle OOS60.0% avg 20.7%

SmartWay PartnerNo

Last Review02/20/2026

Insurance

Amount$1,000,000

Type91X

VerifiedFMCSA · 07/09/2026

CompanyBERKLEY REGIONAL INSURANCE COMPANY

Policy #ECA3150008-13

Last checked09/07/2026

Quick Facts

StatusActive

TypeCarrier

Fleet20 units

Drivers19

Mileage201,996 mi

Operating4 years

MCS-15001/2026

Safety & Inspection Data

Crash Summary

Total Crashes (24-mo)4

Fatal0

Injury2

Tow-Away2

Safety RatingSatisfactory

Driver Inspections

Total13

Out of Service6

OOS Rate46.2%

National Avg5.5%

Above National Average

Vehicle Inspections

Total10

Out of Service6

OOS Rate60.0%

National Avg20.7%

Above National Average

Last FMCSA Review: 02/20/2026 | Rated: 04/03/2026

Safety Trends by Year

Roadside inspections and crashes on file, year over year. The red portion of each inspection bar is the out-of-service share; ▲/▼ compares to the prior year.

Inspections · red = OOS

2023

1 · 0 OOS -

2024

11 · 6 OOS ▲

2025

6 · 3 OOS ▼

2026

1 · 1 OOS ▼

Crashes

2023

0 crashes -

2024

1 crash ▲

2025

1 crash =

2026

2 crashes ▲

Based on FMCSA crash and roadside inspection records (rolling 3-year window). The latest year may be partial.

Out-of-Service Summary Last 24 months

Live FMCSA roadside inspections through Apr 2026, 8 inspections, 5 resulted in out-of-service (62.5% OOS rate).

Driver Out-of-Service 5 OOS

Vehicle Out-of-Service 19 OOS

Live FMCSA roadside inspection records, refreshed monthly.

Crash Records (4)

Full crash history on file (all years), newest first. This list may show more than the headline Crashes figure above, because that figure follows the official FMCSA 24-month SMS window used for the Trust Score, older crashes still appear here for transparency.

Date	Location	State	Injuries	Tow	Vehicles	Weather	Road	Light
05/17/2026	1806	ND	1	1	1	Rain	Wet	Daylight
04/15/2026	I-94	MT	0	1	1	Clear	Dry	Dawn
11/18/2025	78TH AVE NW	ND	1	1	1	Clear	Dry	Daylight
07/29/2024	SHORT RD	ND	0	1	1	Clear	Dry	Daylight

Roadside Violations by Safety Category Last 24 months

78 roadside violations across 8 inspections, grouped into FMCSA safety-behavior categories. The shaded portion shows how many were serious enough to result in an out-of-service order.

ViolationsOut-of-service

Vehicle Maintenance 51 violations · 18 OOS

Unsafe Driving 15 violations · 1 OOS

Driver Fitness 5 violations · 2 OOS

Hours-of-Service (HOS) Compliance 3 violations · 3 OOS

Other (General) 4 violations · 0 OOS

Categories follow FMCSR violation parts (Part 393/396 = Vehicle Maintenance, Part 395 = HOS; "Other" = general/administrative parts such as 390). Raw violation counts and out-of-service results, not FMCSA percentile rankings, which are not published for property carriers.

Inspection Records (19)

Date	State	Level	Location	Violations	OOS	Driver Viol	Driver OOS	Vehicle Viol	Vehicle OOS	HazMat
04/18/2026	ND	Full (Level I)	WILLISTON ND	17	5	0	0	17	5	-	▲Detail
04/09/2025	ND	Walk-Around (Level II)	WILLISTON ND	2	0	0	0	0	0	-	▲Detail
02/24/2025	ND	Driver-Only (Level III)	WILLISTON ND	1	0	0	0	0	0	-	▲Detail
02/01/2025	WY	Walk-Around (Level II)	I90E MM 147	27	9	8	2	19	7	-	▲Detail
02/01/2025	WY	Full (Level I)	I90E MM 147	11	4	2	1	9	3	-	▲Detail
02/01/2025	WY	Full (Level I)	I90E MM 147	15	5	2	1	13	4	-	▲Detail
01/10/2025	ND	Walk-Around (Level II)	GRENORA ND	4	0	2	0	2	0	-	▲Detail
12/03/2024	ND	Driver-Only (Level III)	WILLISTON ND	1	1	0	1	0	0	-	▲Detail
08/22/2024	SD	Driver-Only (Level III)	TILFORD SD	2	1	0	1	0	0	-	▲Detail
08/14/2024	ND	Walk-Around (Level II)	MEDORA ND	4	0	1	0	0	0	-	▲Detail
07/26/2024	ND	Walk-Around (Level II)	WILLISTON ND	1	0	0	0	0	0	-	▲Detail
07/09/2024	TX	Walk-Around (Level II)	US271 AT REGION 8	9	3	1	1	8	2	-	▲Detail
06/24/2024	MT	Walk-Around (Level II)	MALTA MT	1	1	0	0	0	1	-	▲Detail
06/03/2024	ND	Full (Level I)	WILLISTON ND	5	1	0	0	0	1	-	▲Detail
05/16/2024	ND	Walk-Around (Level II)	BOWMAN SCALE	8	1	0	0	0	1	-	▲Detail
04/03/2024	ND	Full (Level I)	WILLISTON ND	5	0	0	0	0	0	-	▲Detail
02/02/2024	ND	Driver-Only (Level III)	WILLISTON ND	0	0	0	0	0	0	-	▲Detail
01/06/2024	ND	Driver-Only (Level III)	WILLISTON ND	1	0	0	0	0	0	-	▲Detail
08/16/2023	ND	Driver-Only (Level III)	PANGER SCALE	1	0	1	0	0	0	-	▲Detail

Safety Performance Percentiles

FMCSA SMS percentile rankings. Higher percentile = worse performance relative to peers.

Total Inspections10

Unsafe Driving 3 viols

HOS Compliance 3 viols

Driver Fitness ALERT 5 viols

Vehicle Maintenance 5 viols

Licensing & Insurance

No insurance history records.

No active insurance policies.

Docket	Type	Action	Served	Disposition	Disp Date
MC1376430	MOTOR PROPERTY COMMON CARRIER	GRANTED	03/16/2022	-	-

No revocation records.

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Trust Score over time and the complete authority and insurance timeline, not just today.

84/100

Excellent

VERIFIED

Every carrier starts at 100. We subtract points for each missing requirement or risk factor below. Verified means all four core requirements pass.

Score breakdown, from 100 to 84

Starts at 100−16 totalFinal 84

Driver out-of-service rate above national average−5

Vehicle out-of-service rate above national average−5

Moderate operating history (3-5 years)−3

Crashes on record (rate-adjusted)−3

Verification, 4 core requirements

Active operating authority

FMCSA shows the USDOT registration and authority are active.

Authorized for hire

Holds active for-hire (common or contract) authority.

Active insurance on file

Insurance coverage and carrier are on file with FMCSA.

Safety rating not Unsatisfactory

Satisfactory FMCSA safety rating.

What's lowering this score

-5

Driver out-of-service rate above national average

Driver OOS 46.1538% vs national avg 5.51%.

-5

Vehicle out-of-service rate above national average

Vehicle OOS 60% vs national avg 20.72%.

-3

Moderate operating history (3-5 years)

Authority granted about 4 years ago.

-3

Crashes on record (rate-adjusted)

Crash rate: 4 crash(es) across 20 vehicles (~0.2 per vehicle); none fatal. Scaled to fleet size and fatal severity.

Where this company lands, risk scales

Crash history (rate-adjusted)−3 of 28

0 pts · low risk−28 pts · high risk

Crash rate: 4 crash(es) across 20 vehicles (~0.2 per vehicle); none fatal. Scaled to fleet size and fatal severity.

Driver out-of-service rate−5 of 5

0 pts · low risk−5 pts · high risk

Driver OOS 46.1538% vs national avg 5.51%.

Vehicle out-of-service rate−5 of 5

0 pts · low risk−5 pts · high risk

Vehicle OOS 60% vs national avg 20.72%.

How we calculate the Trust Score

Every company starts at 100

We subtract points for each missing requirement or risk factor. Verified means all the core requirements for that company's type pass. Nothing is added back, the score is a deduction model built only on public FMCSA data. No pay-to-play, no opinions.

Requirements differ by company type

Each company is judged fairly on its own FMCSA obligations. Anything that doesn't apply shows as a grey N/A, not required, never a penalty.

Carrier (for-hire)

Operating authority, authorized-for-hire, insurance on file, safety rating.

Broker

Broker authority + $75k surety bond (BMC-84/85). MCS-150 not required (no fleet).

Freight forwarder

FF authority + $75k bond + BOC-3. MCS-150 not required (no trucks).

Private carrier

Active USDOT + MCS-150 + safety. No operating authority / for-hire / insurance filing required (hauls its own goods).

Crashes are scaled, not flat

Crash history is proportional. We don't apply a flat penalty, we scale it to (a) crashes per vehicle in the fleet and (b) the share of those crashes that were fatal. So a big, safe fleet barely moves; a small fleet with many (and fatal) crashes takes a large hit.

0 pts deductedscaled by rate & severityup to −28 pts

Low end

50,000 vehicles + 1 crash → ~0 pts. A huge fleet with very few crashes per vehicle is almost untouched.

High end

5 vehicles + 3 crashes incl. fatal → large deduction (near the −28 cap). Many crashes per truck, fatal-heavy.

Mechanics: deduction is capped at 28 points, weighted roughly 60% on crashes-per-vehicle and 40% on the fatal ratio. Zero crashes = zero deduction. If fleet size is unknown, only crash severity can move the score (conservative).

Out-of-service rate vs. the national average

Driver and vehicle out-of-service rates are measured against the FMCSA national average, not a flat number. A company only takes the deduction when it sits above the national benchmark, for example “Vehicle OOS 37% vs national avg 20.7%”.

Point reference, the full menu

Every factor and exactly how many points it can remove. Knockout factors (they also fail Verification) are marked.

Factor	Points
USDOT / authority not active with FMCSA knockout	−25
Missing operating authority (when required) knockout	−15
No insurance or surety bond on file (when required) knockout	−25
Unsatisfactory safety rating knockout	−30
Conditional safety rating	−12
MCS-150 biennial update overdue (carriers)	−10
Crashes, rate-adjusted (per-vehicle & fatal share)	0 to −28
Driver OOS rate above national average	−5
Vehicle OOS rate above national average	−5
Very new carrier (under 1 year)	−10
Limited operating history (1-3 years)	−6
Moderate operating history (3-5 years)	−3
Operating history unknown	−3
No public phone number	−3
No public email address	−2

All inputs come from public FMCSA records (operating authority, insurance/bond filings, the SAFER/SMS safety profile, crash & inspection reports). If FMCSA updates a record, the score updates with it. For the full deduction table, see the methodology page.

COS LLC

Trust Score

Public record

Company Information

Contact Details

Other Companies at This Address

Operating Authorities

Operation Classification

SMS BASIC Scores

Mileage

Drivers

Safety Summary

Insurance

Quick Facts

Safety & Inspection Data

Safety Trends by Year

Out-of-Service Summary Last 24 months

Crash Records (4)

Roadside Violations by Safety Category Last 24 months

Inspection Records (19)

Safety Performance Percentiles

Licensing & Insurance

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