HaulerCheck · https://haulercheck.com/carrier/227340-william-n-mason-inc/ · Checked 2026-10-19 10:14 UTC · Census and inspections Oct 18, 2026 · Authority and insurance: Last known · FMCSA snapshot May 14, 2026
WILLIAM N MASON INC
No risk signals in the last-known data
How risk signals workNothing in the FMCSA record matched our risk signals. That is not a guarantee, and it does not confirm who you are talking to; follow the checks below. Authority and insurance are last known from May 14, 2026.
No cargo cover filed with FMCSA
Not a live check. FMCSA has not published a Motus record for this carrier, so authority and insurance show the last known status from May 14, 2026. Confirm on Motus ↗ before booking.
What to verify next
- Confirm authority and insurance on the official Motus record ↗: our copy is the last known status from May 14, 2026. Safety record: SAFER ↗.
- Call back on the number on file, (410) 525-2288, not a number from an email or load board.
- Check that the MC number you were given is MC407667.
- Ask the insurer for a certificate of insurance naming you as holder, with cargo coverage that fits your load.
Insurance on file
Liability (BI&PD) pays for injury and damage to other people and property; it does not cover the freight. Cargo insurance covers the freight. FMCSA only requires cargo filings from household goods carriers and freight forwarders, so most carriers file none: ask for a cargo certificate that fits your load. No cargo cover filed with FMCSA.
| Type | Docket | Layer | Insurer | Coverage | Effective | Status |
|---|---|---|---|---|---|---|
| Liability (BI&PD) | MC407667 | Primary | SENTRY SELECT INSURANCE COMPANY Policy A0210955001 · 91X | $750,000 | Mar 1, 2023 | Active |
Source: Last known · FMCSA snapshot May 14, 2026. Identical filings repeated in the FMCSA data are shown once; a filing listed under two dockets is one policy, not extra coverage. Coverage is the maximum amount filed with FMCSA, not the full policy.
Last known filings. Insurance for this carrier comes from the FMCSA snapshot of May 14, 2026. Policies may have been cancelled or replaced since. Confirm current filings: Motus record ↗ and ask the insurer for a certificate naming you as holder.
Roadside inspections Oct 18, 2024 – Oct 18, 2026
4 of 14 · Maryland avg 20.7%
1 of 20 · Maryland avg 9.4%
10 most recent inspections
| Date | State | Level | Violations | Out of service |
|---|---|---|---|---|
| Sep 29, 2026 | PA | 1 | 7 | No |
| Sep 25, 2026 | PA | 1 | 0 | No |
| Aug 26, 2026 | MD | 1 | 16 | Yes |
| Jul 2, 2026 | MD | 2 | 1 | No |
| Jun 23, 2026 | PA | 3 | 3 | No |
| May 15, 2026 | TX | 2 | 3 | Yes |
| Jan 15, 2026 | MD | 2 | 1 | No |
| Nov 12, 2025 | MD | 1 | 6 | Yes |
| Sep 10, 2025 | VA | 2 | 0 | No |
| Aug 27, 2025 | MD | 3 | 0 | No |
How these rates are calculated
Period: Oct 18, 2024 – Oct 18, 2026. Vehicle rate = vehicle inspections with a vehicle out-of-service order ÷ vehicle inspections (levels 1, 2, 5 and 6). Driver rate uses levels 1, 2, 3 and 6. The Maryland average covers 42,318 vehicle and 51,664 driver inspections of all Maryland-based carriers in this period. It mixes every type of operation, so compare with care; rates based on a handful of inspections say little. FMCSA's own SMS measures are weighted differently: SMS profile ↗ · SAFER snapshot ↗
Violations in FMCSA's SMS last 24 months
34 violations counted in FMCSA's Safety Measurement System (SMS), 8 of them serious enough to put the driver or vehicle out of service.
Why is this different from the 59 violations above?
The inspections section's number counts every violation written on the inspection reports in our Oct 18, 2024 – Oct 18, 2026 window. The SMS count comes from FMCSA's own monthly SMS snapshot, which uses its own 24-month window and only the violations it scores. Both are FMCSA figures; they measure different things.
| Category (FMCSA BASIC) | Violations | Out of service | Share | Maryland share |
|---|---|---|---|---|
| Vehicle Maintenance | 29 | 7 | 85.3% | 71.4% |
| Unsafe Driving | 3 | 0 | 8.8% | 10.9% |
| Hours-of-Service Compliance | 2 | 1 | 5.9% | 10.3% |
10 most frequent violations
| Violation | Times | Out of service |
|---|---|---|
| Air Brake - Hose/tubing damaged or not secured Brakes All Others · Vehicle Maintenance · code 39345B2BAIR | 2 | 0 |
| Air Brake - CMV manufactured on or after 10/20/1994 has an automatic airbrake adjustment system that fails to compensate for wear Brakes All Others · Vehicle Maintenance · code 39353BB | 2 | 0 |
| Brake Out of Adjustment - Roto Clamp (Short & Long) DD-3 or Bolt Brakes Out of Adjustment · Vehicle Maintenance · code 39347E | 2 | 0 |
| Lighting - Front - Turn signal - inoperative Lighting · Vehicle Maintenance · code 3939ALFTSI | 2 | 0 |
| Lubrication - Oil or grease leak Other Vehicle Defect · Vehicle Maintenance · code 3965BL | 2 | 0 |
| ELD - No record of duty status (ELD Required) Incomplete/Wrong Log · Hours-of-Service Compliance · code 3958AELD | 1 | 1 |
| Brake - Defective brake(s) are equal to or greater than 20% of the service brakes on the vehicle/combination Brake Out Of Service · Vehicle Maintenance · code 3963A1BOS | 1 | 1 |
| Drum Brake - Cracked/loose/missing lining/pad on a steering axle Brakes All Others · Vehicle Maintenance · code 39347ABCLMBDSA | 1 | 1 |
| Air Brake - Air reservoir separated from its original attachment points or moving more than 1 inch Brakes All Others · Vehicle Maintenance · code 3963A1BARS | 1 | 1 |
| Cargo - Vehicle components or dunnage not secured General Securement · Vehicle Maintenance · code 3929A2C | 1 | 1 |
Source: FMCSA SMS violation file, inspections in the last 24 months, published Oct 18, 2026. "Share" is this company's mix of violations; the Maryland column is the mix across all Maryland-based carriers, so you can see which kinds of problems stand out. A high count partly reflects fleet size and how often trucks are inspected.
Crashes Oct 18, 2024 – Oct 18, 2026
2 most recent crashes
| Date | Location | Fatalities | Injuries |
|---|---|---|---|
| Oct 23, 2025 | New Kent, VA | 0 | 0 |
| Oct 18, 2024 | Durham, NC | 0 | 0 |
Reportable crashes do not imply the carrier was at fault.
Company details FMCSA census · Oct 18, 2026
| USDOT number | 227340 |
|---|---|
| MC / docket | MC407667 |
| Legal name | WILLIAM N MASON INC |
| Operation | Interstate |
| Business type | Corporation |
| Power units | 15 |
| Drivers | 11 |
| Annual mileage | 278,770 (2024) |
| Hazmat | Yes |
| Safety rating | Satisfactory (Nov 2, 2002) |
| USDOT number added | Jan 19, 1983 · 43 years ago |
| Last MCS-150 update | May 6, 2026 |
Cargo carried
General FreightMotor VehiclesBuilding MaterialsMachinery, Large ObjectsConstruction
Questions about WILLIAM N MASON INC
What does WILLIAM N MASON INC's operating authority allow?
MC407667: Contract carrier (may haul regulated property for hire under continuing contracts with specific shippers).
Which information about WILLIAM N MASON INC is old or missing?
Operating authority is the last known status from the FMCSA snapshot of May 14, 2026, not a current check. Insurance filings are from the same May 14, 2026 snapshot.
What should I verify before booking WILLIAM N MASON INC?
Confirm the authority and insurance on the Motus record for USDOT 227340. Call the company back on the phone number on file, (410) 525-2288, not a number from an email or load board message. Check that the MC number the dispatcher gave you matches MC407667, and ask the insurer for a certificate of insurance naming you as holder, with cargo coverage that fits your load.
Other trucking companies in Baltimore, MD →
Company details from the FMCSA Company Census File (Oct 18, 2026). Inspections and crashes from FMCSA MCMIS files. About our data · Report an error on this page (how corrections work).
Page generated 2026-10-19 10:14 UTC.