San Diego is the registered base for 7,019 motor carriers, running 80,472 power units and 29,094 drivers between them. The local base is dominated by very small operators: 76% run a single power unit, so in most cases the owner is also the safety manager, the designated employer representative and the person answering an audit letter.
DOT Compliance Companies in San Diego, CA
DOT compliance resources for San Diego carriers working in port, border and regional freight.
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DOT compliance providers serving California
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Gioioso Coaching and Consulting LLC
Premium MemberFor over 5 years, we've helped drivers safely get back behind the wheel so they can provide for themselves and their families. We will explain the entire process and help…
- SAP return-to-duty evaluations
Covers: Alaska · Arizona · Arkansas
Upper Rogue Counseling and Wellness Center
Verified MemberI am a licensed Marriage & Family Therapist, Social Worker and a Oregon Department of Transportation Substance Abuse Professional (SAP). My 25+ years of clinical experience have been focused on…
- DOT SAP evaluations
- SAP return-to-duty evaluations
Covers: California · Nevada · Oregon
Mobile Occupational Services, Inc.
Free Member- DOT drug and alcohol testing program management
Covers: California
The San Diego carrier base in numbers
| Carriers registered locally | 7,019 |
|---|---|
| Single-truck operators | 5,354 (76%) |
| Fleets of 2 to 10 power units | 1,397 (20%) |
| Fleets above 50 power units | 59 |
| Carriers flagged for hazardous materials | 256 (4%) |
| Registrations added since 2025 | 626 (9%) |
| Last MCS-150 filed more than 24 months ago | 1,267 (18%) |
What the local carrier data shows
Of the carriers registered here, 1,267 (18%) are carrying an MCS-150 older than 24 months, which is well below the national rate of 38%. That filing is required on the applicable biennial cycle even when nothing about the business has changed. An outdated or inactive USDOT record can also create issues with brokers, shippers, insurers and other counterparties.
Single-truck operators make up 76% of carriers here, well above the 64% national share, with a further 20% running two to ten units.
256 local carriers, 4% of the base, are flagged for hazardous materials, close to the national 7%. Hazmat operations answer to a shorter corrective-action clock if a safety audit goes against them.
Freight and routes around San Diego
San Diego carriers can work across port activity, border freight, regional delivery, construction supply and California compliance controls.
Federal and California requirements
- FMCSA: USDOT number, operating authority, safety regulations
- California DMV and CHP: Intrastate registration, IRP apportioned plates, IFTA fuel tax
A change made in one system may also require a separate filing or update in the other.
Sources: Port of San Diego terminal guidance, CARB Clean Truck Check guidance, Caltrans strategic freight planning, FMCSA registration guidance.
Services for drivers and carriers in San Diego
More DOT compliance locations in California
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DOT compliance questions for San Diego
What cargo terminals operate in San Diego?
The Port of San Diego identifies Tenth Avenue Marine Terminal and National City Marine Terminal as its two cargo terminals, with different cargo and facility profiles.
Do San Diego terminal drivers need TWIC?
Confirm the current terminal procedure. TWIC may be required for unescorted access to secure or restricted areas, while some terminals may allow escorted access for drivers without a valid TWIC.
Which California rules can affect refrigerated fleets?
Depending on the equipment, Clean Truck Check and CARB transport refrigeration requirements may apply. Scope and deadlines should be checked by vehicle.
How should border delays appear in an HOS review?
The duty record should reflect the driver's actual status, supported by crossing, dispatch, fuel, gate and shipment records where relevant.
Can a San Diego compliance provider review both port and federal records?
Many providers can coordinate them, but the carrier should confirm experience with its terminal, cargo, CARB and federal program needs.
DOT compliance guides
FMCSA Post-Accident Drug and Alcohol Testing: Decision Guide
A carrier-ready decision guide for fatalities, injuries, disabling damage, citations and after-hours testing deadlines.
Read guideWho Pays for a DOT SAP Evaluation?
DOT does not assign SAP costs to one party. Here is how policy, benefits and employer responsibilities fit…
Read guideIFTA Quarterly Mileage and Fuel Log Template 2026: Free PDF
Download per-jurisdiction mileage and fuel log sheets with the quarterly deadline table and the record retention basics IFTA…
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