ONTARIO
Roadside inspection site in California • 1,657 inspections on record
About This Inspection Site
ONTARIO is a roadside inspection location in California where FMCSA-certified inspectors conduct safety inspections of commercial motor vehicles under the Motor Carrier Safety Assistance Program (MCSAP). This site has conducted 1,657 recorded inspections from Jan 1, 2020 to Mar 29, 2026.
A total of 883 unique carriers have been inspected at this site. The average number of violations per inspection is 1.0. The out-of-service rate is 12.1%, meaning a moderate number of inspected vehicles or drivers are placed out of service for safety deficiencies.
Inspections follow CVSA (Commercial Vehicle Safety Alliance) North American Standard procedures and may include weight checks, credential verification, mechanical inspection, hours-of-service compliance review, and hazardous materials documentation checks. Vehicles or drivers that fail critical safety criteria are placed out of service until deficiencies are corrected.
The most frequently cited violation at this site is Operating a CMV while ill or fatigued (Unsafe Driving) with 269 citations, followed by Operating a CMV while ill or fatigued (92 citations). A total of 100 distinct violation codes have been cited at this location.
Inspection Level Breakdown
1,657 inspections by CVSA level
Top Violations
100 violation codes cited at this site (page 1 of 2)
| # | Code | Description | BASIC Category | Citations | OOS | OOS % |
|---|---|---|---|---|---|---|
| 1 | 392.2 | Operating a CMV while ill or fatigued | Unsafe Driving | 269 | 5 | 1.9% |
| 2 | 392.2-SLLSR | Operating a CMV while ill or fatigued | Unsafe Driving | 92 | 0 | — |
| 3 | 393.9(a) | Inoperable required lamps | Vehicle Maintenance | 83 | 15 | 18.1% |
| 4 | 392.2-SLLEQP | Operating a CMV while ill or fatigued | Unsafe Driving | 76 | 1 | 1.3% |
| 5 | 392.2-SLLSOA | Operating a CMV while ill or fatigued | Unsafe Driving | 63 | 0 | — |
| 6 | 392.2-SLLTCD | Operating a CMV while ill or fatigued | Unsafe Driving | 54 | 0 | — |
| 7 | 392.2-SLLLR | Operating a CMV while ill or fatigued | Unsafe Driving | 50 | 0 | — |
| 8 | 396.3(a)(1) | Inspection/repair/maintenance - general | Vehicle Maintenance | 40 | 8 | 20.0% |
| 9 | 393.75A3-TAOL | Tires - All others leaking or inflation less than 50% of the maximum inflation pressure on tire not equipped with ATIS | Vehicle Maintenance | 36 | 35 | 97.2% |
| 10 | 393.45(b)(2) | Brake tubing/hoses inadequate | Vehicle Maintenance | 35 | 6 | 17.1% |
| 11 | 393.9A-LFTSI | Inoperable required lamps | Vehicle Maintenance | 22 | 0 | — |
| 12 | 393.75(a)(3) | Tire-flat and/or audible air leak | Vehicle Maintenance | 21 | 21 | 100.0% |
| 13 | 390.21T(b) | 390.21T(b) | General/Admin | 19 | 0 | — |
| 14 | 392.2-SLL | Operating a CMV while ill or fatigued | Unsafe Driving | 17 | 0 | — |
| 15 | 392.2-SLLSIV | Operating a CMV while ill or fatigued | Unsafe Driving | 17 | 0 | — |
| 16 | 393.11 | Lighting devices/reflectors | Vehicle Maintenance | 16 | 0 | — |
| 17 | 393.9A-LIL | Inoperable required lamps | Vehicle Maintenance | 15 | 0 | — |
| 18 | 393.95F | Emergency Equipment - Stopped vehicle warning devices missing or improper | Vehicle Maintenance | 15 | 0 | — |
| 19 | 393.95(a) | Emergency equipment - fire extinguisher missing/defective | Vehicle Maintenance | 15 | 0 | — |
| 20 | 392.2-SLLDL | Operating a CMV while ill or fatigued | Unsafe Driving | 15 | 2 | 13.3% |
| 21 | 393.9A-LCL | Inoperable required lamps | Vehicle Maintenance | 14 | 0 | — |
| 22 | 393.95A1 | Emergency Equipment - Fire Extinguishers - no fire extinguisher present or not properly rated. | Vehicle Maintenance | 13 | 0 | — |
| 23 | 390.21TB1-MC | 390.21TB1-MC | General/Admin | 13 | 0 | — |
| 24 | 393.9A-LHLI | Inoperable required lamps | Vehicle Maintenance | 12 | 0 | — |
| 25 | 393.60(d) | Glazing/window obstructions | Vehicle Maintenance | 12 | 0 | — |
| 26 | 390.21TB2-DOT | 390.21TB2-DOT | General/Admin | 12 | 0 | — |
| 27 | 393.9A-LTSI | Inoperable required lamps | Vehicle Maintenance | 11 | 11 | 100.0% |
| 28 | 390.21T(a) | 390.21T(a) | General/Admin | 11 | 0 | — |
| 29 | 393.47E | Slack adjuster defective | Vehicle Maintenance | 11 | 0 | — |
| 30 | 393.45B2-BHTD | Brake tubing/hoses inadequate | Vehicle Maintenance | 11 | 5 | 45.5% |
| 31 | 393.75C-TAOTD-LT2/32 | Tire tread depth insufficient (other axles) | Vehicle Maintenance | 10 | 1 | 10.0% |
| 32 | 393.43 | Brake - relay emergency valve | Vehicle Maintenance | 9 | 0 | — |
| 33 | 393.75A3-TAOLTIS | Tires - All others leaking in tread area and inflation less than 50% of the maximum inflation pressure on tire equipped with ATIS | Vehicle Maintenance | 9 | 9 | 100.0% |
| 34 | 383.23A2-LCDLN | License (CDL) - Operate a CMV and does not possess a valid CDL | Driver Fitness | 8 | 8 | 100.0% |
| 35 | 376.11(d)(1) | 376.11(d)(1) | Unknown | 8 | 0 | — |
| 36 | 396.3A1-BOS | BRAKES OUT OF SERVICE: The number of defective brakes is equal to or greater than 20 percent of the service brakes on the vehicle or combination | Vehicle Maintenance | 8 | 8 | 100.0% |
| 37 | 393.60C | Glazing/window obstructions | Vehicle Maintenance | 8 | 0 | — |
| 38 | 393.78 | Windshield condition defective | Vehicle Maintenance | 8 | 0 | — |
| 39 | 392.16(a) | Failing to use seat belt (49 CFR) | Unsafe Driving | 7 | 0 | — |
| 40 | 393.60(c) | Glazing/window obstructions | Vehicle Maintenance | 7 | 0 | — |
| 41 | 393.45 | Brake tubing/hoses inadequate | Vehicle Maintenance | 7 | 5 | 71.4% |
| 42 | 393.9A-LRLI | Inoperable required lamps | Vehicle Maintenance | 7 | 0 | — |
| 43 | 392.9A2-C | Cargo - Vehicle components or dunnage not secured | Unsafe Driving | 7 | 4 | 57.1% |
| 44 | 393.9A-LSLI | Inoperable required lamps | Vehicle Maintenance | 7 | 0 | — |
| 45 | 393.95A4-EEUS | Emergency Equipment - Fire Extinguishers - unsecured | Vehicle Maintenance | 6 | 0 | — |
| 46 | 393.75(c) | Tire tread depth insufficient (other axles) | Vehicle Maintenance | 6 | 1 | 16.7% |
| 47 | 383.23(a)(2) | CDL - wrong class | Driver Fitness | 6 | 6 | 100.0% |
| 48 | 393.9A-HLLH | Inoperable required lamps | Vehicle Maintenance | 6 | 0 | — |
| 49 | 393.45B2-B-AIR | Brake tubing/hoses inadequate | Vehicle Maintenance | 6 | 0 | — |
| 50 | 393.45B2-B | Brake tubing/hoses inadequate | Vehicle Maintenance | 5 | 0 | — |
Top Carriers Inspected
20 most frequently inspected carriers at this site
| # | Carrier | USDOT | State | Inspections |
|---|---|---|---|---|
| 1 | CHAFFEY JOINT UNION HIGH SCHOOL DISTRICT | 2654660 | CA | 258 |
| 2 | TRANSDEV SERVICES INC | 505166 | IL | 69 |
| 3 | UNITED PARCEL SERVICE INC | 21800 | GA | 64 |
| 4 | PACIFIC COAST PROPANE LLC | 1730789 | CA | 33 |
| 5 | CITY OF ONTARIO | 2734393 | CA | 24 |
| 6 | GREENLINE LLC | 1339646 | CA | 18 |
| 7 | J B HUNT TRANSPORT INC | 80806 | AR | 17 |
| 8 | FEDERAL EXPRESS CORPORATION | 86876 | TN | 14 |
| 9 | MV TRANSPORTATION INC | 975853 | TX | 12 |
| 10 | PENSKE TRUCK LEASING CO LP | 327574 | PA | 12 |
| 11 | YZER LLC | 3292652 | FL | 9 |
| 12 | FEDEX FREIGHT INC | 239039 | AR | 9 |
| 13 | EFI ENGINEERING INC | 3464372 | CA | 8 |
| 14 | COLTON JOINT UNIFIED SCHOOL DISTRICT | 2809587 | CA | 7 |
| 15 | CORRECT EXPRESS INC | 3583748 | CA | 7 |
| 16 | OREPAC HOLDING COMPANY | 204036 | OR | 6 |
| 17 | CDMAX TRANSPORT INC | 3013950 | CA | 6 |
| 18 | SWIFT TRANSPORTATION CO OF ARIZONA LLC | 54283 | AZ | 6 |
| 19 | PARKING CONCEPTS INC | 2192644 | CA | 6 |
| 20 | WAL-MART TRANSPORTATION LLC | 63585 | AR | 5 |
Recent Inspections
1,657 inspections at this site (page 1 of 67)