MARKWEST ENERGY OPERATING COMPANY LLC
DBA: MPLX G&P
Operations
What MARKWEST ENERGY OPERATING COMPANY LLC’s FMCSA record shows
Each field from the public registration, and what it means when you’re vetting this carrier.
- USDOT number 4151788
- The USDOT number is FMCSA's permanent ID for this company. It never changes, even when the business renames, moves, or changes owners, so it's the most reliable way to identify MARKWEST ENERGY OPERATING COMPANY LLC.
- MC number None on file
- No MC number is on file. That's normal for private fleets hauling their own goods and for intrastate-only carriers, but a company with no MC number can't legally haul regulated interstate freight for hire.
- Operating status Active
- FMCSA lists this USDOT number as active. Active status alone doesn't confirm current insurance or operating authority; those are separate checks.
- Operation type Interstate
- Interstate carriers can haul freight across state lines and fall under the full federal safety rules (FMCSRs).
- Fleet size 122 power units, 135 drivers
- MARKWEST ENERGY OPERATING COMPANY LLC self-reports 122 power units (trucks and tractors), which makes it a large fleet. Fleet counts come from the carrier's own MCS-150 filing and aren't independently audited.
- Last MCS-150 update Dec 28, 2023
- The MCS-150 is the registration form where carriers report their address, fleet size, and operations. MARKWEST ENERGY OPERATING COMPANY LLC last filed it on Dec 28, 2023. That's past FMCSA's two-year update requirement. Confirm the address, phone, and fleet size directly.
Safety profile
FMCSA BASIC percentiles, inspection history, and out-of-service rates.
Full safety report
All 7 FMCSA BASIC percentiles, recent inspection records, vehicle & driver out-of-service rates — free with any account.
Crash history
State-reportable crashes, severity breakdown, and time-decayed analysis.
Crash history
Individual crash records with date, severity (fatal / injury / tow-away), and fleet-normalized rate.
Insurance & compliance
Active policy coverage, insurance carrier, effective dates, and historical gaps.
Insurance details
BI&PD coverage, cargo insurance, insurance carrier name, effective dates — a critical pre-booking check.
Authority & cross-reference
Authority revocation history and chameleon carrier detection across 4.4M records.
Authority & cross-reference
Every authority grant, revocation, and reinstatement — plus chameleon flags from address / officer / phone matches.
Frequently asked questions about MARKWEST ENERGY OPERATING COMPANY LLC
Common questions about this carrier, answered from FMCSA public records.
Is MARKWEST ENERGY OPERATING COMPANY LLC a legitimate motor carrier?
MARKWEST ENERGY OPERATING COMPANY LLC is registered with FMCSA under USDOT number 4151788. Operating authority status is currently Active. Carrier90's trust score of 74/100 yields a REVIEW verdict based on safety, insurance, authority, and crash data.
What is MARKWEST ENERGY OPERATING COMPANY LLC's safety score?
Carrier90 scores MARKWEST ENERGY OPERATING COMPANY LLC at 74 out of 100 with a REVIEW verdict. The score combines FMCSA BASIC percentiles, crash history, insurance status, operating authority, and chameleon carrier detection signals.
Where is MARKWEST ENERGY OPERATING COMPANY LLC based?
MARKWEST ENERGY OPERATING COMPANY LLC lists its physical address in DENVER, CO in FMCSA records. The physical state and city fields are provided by the carrier on their MCS-150 form.
Is USDOT 4151788 active?
USDOT 4151788 (MARKWEST ENERGY OPERATING COMPANY LLC) operating authority status is currently Active. Last verified by Carrier90 on October 22, 2026. Data is sourced from live FMCSA federal records.
How many trucks does MARKWEST ENERGY OPERATING COMPANY LLC operate?
MARKWEST ENERGY OPERATING COMPANY LLC reports 122 power units and employs 135 drivers to FMCSA. These figures come from the carrier's most recent MCS-150 filing.
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