MARKWEST ENERGY OPERATING COMPANY LLC
AUTHORIZEDDBA: MPLX G&P
USDOT
4151788
MC Number
N/A
Fleet Size
122
Total Drivers
135
Last updated: March 16, 2026
Safety overview
MARKWEST ENERGY OPERATING COMPANY LLC is a large interstate motor carrier based in DENVER, Colorado, operating 122 power units with 135 drivers. None of their 5 BASIC scores cross the 75th percentile intervention line. Their driver out-of-service rate of 0.0% comes in under the 5.51% national average. No crashes on file. FMCSA records show 11 inspections for this carrier.
BASIC scores
SMS PercentilesHigher percentile = worse performance relative to peers. Scores at or above 75% may trigger an FMCSA investigation.
Out-of-service rates vs. national average
An out-of-service order means the driver or vehicle was pulled from operation during a roadside inspection.
For reference, the average driver OOS rate in Colorado is 11.1% and the average vehicle OOS rate is 26.1% across 48,014 carriers.
Company details
- Entity Type
- N/A
- Carrier Operation
- Interstate
- Operation Classification
- Private (Property)
- Cargo Carried
- N
- Hazmat
- No
- Safety Rating Date
- N/A
What are BASIC scores?
FMCSA tracks carrier performance through its Safety Measurement System (SMS), which scores carriers across six categories called BASICs. Each score is a percentile from 0 to 100, based on inspection and crash data from the past 24 months.
A score of 65 means the carrier performed worse than 65% of its peers. Anything above 75% can trigger FMCSA alerts or investigations. Brokers vetting new carriers should pay attention to scores above 50%.
- Unsafe driving
- Speeding, reckless driving, improper lane changes, seatbelt violations. All based on what officers find during roadside inspections.
- HOS / Fatigue
- Hours-of-service violations, logbook problems, driving past the allowed limits. Fatigued driving is one of the top causes of truck crashes in the US.
- Driver fitness
- Licensing problems, expired medical certificates, and other driver qualification issues.
- Controlled substances
- Drug and alcohol testing violations, possession, or impairment.
- Vehicle maintenance
- Brake problems, tire issues, lighting defects, load securement failures. Caught during the vehicle portion of roadside inspections.
- Crash indicator
- Based on crash history from state-reported data. Higher percentile means more crashes relative to the carrier's size and mileage.
Inspections
11
Total
52%
Driver %
Crash history
0
Total Crashes
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Frequently asked questions
Is MARKWEST ENERGY OPERATING COMPANY LLC authorized to operate?
Yes. MARKWEST ENERGY OPERATING COMPANY LLC (USDOT #4151788) currently holds "AUTHORIZED" status with FMCSA. They're registered as an interstate carrier.
What is MARKWEST ENERGY OPERATING COMPANY LLC's safety record?
Based on FMCSA data, MARKWEST ENERGY OPERATING COMPANY LLC has no BASIC scores above the 75th percentile intervention threshold. They haven't received a formal FMCSA safety rating. No crashes on record.
How many trucks does MARKWEST ENERGY OPERATING COMPANY LLC operate?
MARKWEST ENERGY OPERATING COMPANY LLC operates 122 power units with 135 drivers on file. That puts them in the large carrier category by FMCSA standards.
Does MARKWEST ENERGY OPERATING COMPANY LLC transport hazardous materials?
No. MARKWEST ENERGY OPERATING COMPANY LLC does not have a hazardous materials flag in the FMCSA database.
Where is MARKWEST ENERGY OPERATING COMPANY LLC located?
MARKWEST ENERGY OPERATING COMPANY LLC is based in DENVER, Colorado at 1515 ARAPAHOE ST STE 1-600, 80202-2137. Phone: (419) 422-2121.
What are MARKWEST ENERGY OPERATING COMPANY LLC's out-of-service rates?
MARKWEST ENERGY OPERATING COMPANY LLC's driver out-of-service rate is 0.0%, compared to the national average of 5.51%. Below average, which is a good sign. Their vehicle out-of-service rate is 20.0% (national average: 20.72%).