DBA: Mplx G&P
Markwest Energy Operating Company Llc is an active interstate carrier based in Denver, CO.
No insurance filings on record.
View on FMCSA L&I| Vehicle Type | Owned | Term Leased | Trip Leased |
|---|---|---|---|
| Straight Trucks | 122 | 0 | 0 |
| Trailers | 23 | 0 | 0 |
| Total Power Units | 122 | ||
Distinct vehicles · 24 mo
vs 122 self-reported (MCS-150)
Top makes
Registered in
Higher values = more violations. 0 = clean record.
| Category | Insp w/ Viol |
|---|
| Category | vs. Cohort | vs. State | Reading |
|---|---|---|---|
| Unsafe Driving | 0% | 0% | Better than most peers |
| HOS Compliance | 0% | 0% | Better than most peers |
| Driver Fitness | 0% | 0% | Better than most peers |
| Controlled Substances | 0% | 0% | Better than most peers |
| Vehicle Maintenance | 44% | 88% | Around peer average |
Lower percentile = lower SMS measure = stronger safety record. Computed nightly across active carriers in the same state and fleet-size band.
| Type | Inspections | OOS | OOS % | Nat'l Avg |
|---|---|---|---|---|
| Driver | 0 | 0 | — | 6.67% |
| Vehicle | 0 | 1 | — | 22.26% |
| Hazmat | 0 | 0 |
| Period | Fatalities | Injuries | Tow-away | Total |
|---|---|---|---|---|
| No crashes recorded | 0 | 0 | 0 | 0 |
Most-cited violation codes
| BASIC Category | Total | Severe | OOS |
|---|---|---|---|
| Vehicle Maintenance | 3 | 0 | 2 |
| Date | State | Vehicle | Violations | OOS |
|---|---|---|---|---|
| Sep 11, 2025 | KY | STRAIGHT TRUCK | 1 | 1 |
| May 29, 2025 | PA | STRAIGHT TRUCK | 1 | 0 |
| May 14, 2025 | PA | STRAIGHT TRUCK | 0 | 0 |
| Mar 18, 2025 | KY | STRAIGHT TRUCK | 0 | 0 |
| Measure |
|---|
| Alert |
|---|
| Unsafe Driving | 0 | 0.00 | — |
| HOS Compliance | 0 | 0.00 | — |
| Vehicle Maintenance | 3 | 1.46 | — |
| Driver Fitness | 0 | 0.00 | — |
| Controlled Substances | 0 | 0.00 | — |
| — |
| 4.44% |
Where they run
Inspected in 3 states. Top state PA accounts for 55% of activity. Activity outside home state (CO): 100%.
| Jan 30, 2025 |
| KY |
| STRAIGHT TRUCK |
| 0 |
| 0 |
| Nov 20, 2024 | PA | STRAIGHT TRUCK | 0 | 0 |
| Nov 7, 2024 | PA | STRAIGHT TRUCK | 0 | 0 |
| Oct 30, 2024 | PA | STRAIGHT TRUCK | 0 | 0 |
| Sep 11, 2024 | OH | STRAIGHT TRUCK | 0 | 0 |
| May 14, 2024 | PA | STRAIGHT TRUCK | 1 | 1 |
| Date | Code | Description | BASIC | OOS |
|---|---|---|---|---|
| Sep 11, 2025 | 39343DBMA | Brake - Breakaway not attached to the towing vehicle | Vehicle Maintenance | Yes |
| May 29, 2025 | 39395A | No/discharged/unsecured fire extinguisher | Vehicle Maintenance | — |
| May 14, 2024 | 393100C | Failure to prevent cargo shifting | Vehicle Maintenance | Yes |