ONTARIO
Roadside inspection site in California • 2,635 inspections on record
ONTARIO is a roadside inspection site in California where state law-enforcement officers conduct commercial-vehicle inspections under the federal Motor Carrier Safety Assistance Program (MCSAP). Most inspections at this site are Level V — Vehicle Only. Inspectors have been on site within the last 30 days. Use this page to see how often the site is active, what violations inspectors most often cite, which carriers come through, and how the out-of-service rate compares to the state average.
High-activity inspection station
ONTARIO has hosted FMCSA-recorded inspections within the last 30 days. It's currently an active stop on the MCSAP enforcement circuit and you should expect inspectors on site at typical operating hours.
- Name:
- ONTARIO
- State:
- California (CA)
- Total Inspections (station key):
- 2,635
- OOS Rate:
- 10.5%
- Active Since:
- Jan 1, 2020
- Latest Inspection:
- Oct 6, 2026
Ranks 57th by inspection volume in California • 3323rd by OOS rate.
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 2,635 recorded inspections attributed to its station key from Jan 1, 2020 to Oct 6, 2026 .
A total of 1,342 unique carriers have been inspected at this site. The average number of violations per inspection is 0.9. The out-of-service rate is 10.5%, meaning a moderate number of inspected vehicles or drivers are placed out of service for safety deficiencies.
This site has conducted 41 inspections involving hazardous materials violations, representing 1.6% of all inspections. HazMat inspections include verification of placarding, shipping papers, container integrity, and driver training documentation.
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 Violation of Local Laws - Explain: (Unsafe Driving) with 269 citations , followed by State/Local Laws - State registration/tag violation. (163 citations) . A total of 198 distinct violation codes have been cited at this location.
Reported inspection-feed labels
Raw FMCSA reported-location label recorded on inspections already attributed to this station key. Tile counts use that station-key scope (same population as the hero). Each link opens the audit/evidence cluster page for that label — every inspection FMCSA filed under that exact reported text in the California inspection feed, including rows not yet keyed to this canonical station. Those cluster pages can therefore show a higher total. For the deep canonical-station view, you're already here.
Inspection Level Breakdown
2,635 station-key inspections by CVSA level (same total as the hero).
Most-Cited Violations at This Station
Top 10 FMCSR codes by citation count. Full violation-code table →
| # | Code | Citations | OOS % |
|---|---|---|---|
| 1 | 392.2 | 269 | 1.9% |
| 2 | 392.2-SLLSR | 163 | 0.0% |
| 3 | 392.2-SLLEQP | 133 | 2.3% |
| 4 | 392.2-SLLSOA | 120 | 0.0% |
| 5 | 392.2-SLLLR | 116 | 0.0% |
| 6 | 393.9(a) | 83 | 18.1% |
| 7 | 392.2-SLLTCD | 69 | 0.0% |
| 8 | 393.75A3-TAOL | 54 | 98.1% |
| 9 | 393.9A-LFTSI | 40 | 0.0% |
| 10 | 396.3(a)(1) | 40 | 20.0% |
Top Carriers Inspected Here
Carriers most frequently inspected at this site — top 25 by inspection count. Browse all 1,342 carriers →
| # | Carrier | Inspections |
|---|---|---|
| 1 | CHAFFEY JOINT UNION HIGH SCHOOL DISTRICT | 258 |
| 2 | ZUM SERVICES INC | 88 |
| 3 | UNITED PARCEL SERVICE INC | 80 |
| 4 | TRANSDEV SERVICES INC | 69 |
| 5 | KONOIKE-PACIFIC CALIFORNIA INC | 40 |
| 6 | PACIFIC COAST PROPANE LLC | 33 |
| 7 | CITY OF ONTARIO | 29 |
| 8 | HEAVY WEIGHT TRANSPORT INC | 27 |
| 9 | S P F LOGISTICS INC | 22 |
| 10 | FEDERAL EXPRESS CORPORATION | 21 |
| 11 | J B HUNT TRANSPORT INC | 20 |
| 12 | GREENLINE LLC | 18 |
| 13 | PRICE AIR FREIGHT INC | 17 |
| 14 | PONCE GROUND SERVICE LLC | 17 |
| 15 | WAL-MART TRANSPORTATION LLC | 16 |
| 16 | FEDEX FREIGHT INC | 12 |
| 17 | PENSKE TRUCK LEASING CO LP | 12 |
| 18 | PACIFIC COAST CONTAINER INC | 12 |
| 19 | MV TRANSPORTATION INC | 12 |
| 20 | BURRTEC WASTE INDUSTRIES INC | 12 |
| 21 | VISSER BUS SERVICES INC | 11 |
| 22 | ALTA LOMA SCHOOL DISTRICT | 11 |
| 23 | OMNITRANS | 10 |
| 24 | YZER LLC | 9 |
| 25 | SWIFT TRANSPORTATION COMPANY OF ARIZONA LLC | 8 |
Inspection Volume by Year
All years on file at this site — complements the monthly chart below.
Monthly Inspection Volume
Inspections per month, last 43 months on chart.
Peer Stations in California
Stations of similar inspection volume — useful for comparing OOS rates and operating patterns.
OOS Rate vs California Average
How this site's out-of-service rate compares to the state-wide weighted average.
Recent Inspections
Latest 10 of 1,318 inspections at this site. View full inspection log →
Full record tables
Paginated carrier, inspection, and violation-code logs for this station.
About FMCSA inspection stations
FMCSA inspection stations — sometimes called weigh stations, scales, or ports of entry — are the physical points where state law-enforcement officers stop commercial motor vehicles to conduct safety inspections, weight checks, and credential verification. The federal Motor Carrier Safety Assistance Program (MCSAP) funds the inspector workforce; the Commercial Vehicle Safety Alliance (CVSA) defines the inspection-level standards (Levels I through VI). Every report becomes part of FMCSA's national inspection file, which is what TruckCodex mirrors here.
A station's "OOS rate" — out-of-service rate — measures the share of inspections that ended with the vehicle, driver, or both placed out of service. A high OOS rate doesn't necessarily mean the inspectors are stricter; more often it reflects the population of carriers passing through the corridor. A low OOS rate often means the station is on a route used by larger, well-maintained fleets running regular pre-trip programs.
TruckCodex is not affiliated with the FMCSA, MCSAP, CVSA, or any state DOT. Every station record on this site is sourced from the public FMCSA inspection file and refreshed daily. We do not publish staffed hours, schedule changes, or upcoming enforcement details — those would not be public to begin with. For the live status of any specific station, contact the operating state's commercial-vehicle enforcement bureau.