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
Broker verification report
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Safety overview
MARKWEST ENERGY OPERATING COMPANY LLC is a large interstate motor carrier based in DENVER, Colorado, operating 122 power units with 135 drivers. CarrierOwl is currently validating BASIC percentile display against the official FMCSA SMS portal; use the inspection, out-of-service, crash, authority, and insurance data below as the primary public safety indicators on this page. 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.
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BASIC scores
Under reviewCarrierOwl is validating BASIC percentile calculations against the official FMCSA SMS portal. Until that review is complete, use FMCSA directly for current BASIC percentiles and use the inspection, out-of-service, crash, authority, and insurance data on this page as supporting indicators.
BASIC percentile display is temporarily paused while we validate CarrierOwl's methodology against the official FMCSA SMS portal.
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
Inspections
11
Total
52%
Driver %
Insurance on file
No insurance records on file with FMCSA.
Crash history
0
Total Crashes
Similar carriers in Colorado
Other carriers in the same state with a similar fleet size.
G&Z TRANSPORT LLC
CONNELL RESOURCES INC
JEFFERSON COUNTY
ROYAL CREST DAIRY INC
BALIC TRANSPORT INC
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?
MARKWEST ENERGY OPERATING COMPANY LLC has 11 inspections on file and no crashes on record. They do not show a formal FMCSA safety rating in CarrierOwl's current data. CarrierOwl is validating BASIC percentile display against the official FMCSA SMS portal, so brokers should verify current BASIC percentiles directly with FMCSA before relying on them.
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%).