Direct answers on 178.503 hazmat violations: OOS rates, enforcement trends, and what to do after being cited. Data from 13M+ roadside inspections.
Ranks #2,295 of 3,146 FMCSR codes by citation frequency • OOS rate of 12.5% is below the FMCSR-wide average of 33.3%.
Direct answers grounded in TruckCodex inspection data
Only 12.5% of 178.503 citations result in an out-of-service order. Across our 13 million inspection records, the all-FMCSR average OOS rate is 31.4%, so this violation is significantly less likely to ground your truck than most other codes. Of the 8 all-time citations on record for 178.503, just 1 resulted in an OOS placement. That said, hazmat violations are enforcement priorities, so compliance matters immediately even if your truck stays operational.
178.503 is among the least-cited hazmat codes in its category. Our database shows 177.834(a) (general loading/unloading hazmat) generates 3,839 citations with a 97.9% OOS rate—nearly 8 times more frequent and far more severe. Placard violations (177.817(a)) hit 2,274 citations at 75.1% OOS rate. With only 8 all-time citations nationally, 178.503 reflects a much narrower compliance issue, but it remains a hazmat violation and should not be ignored.
No active enforcement pattern exists currently. Our inspection records show zero citations for 178.503 in the last 12 months and zero in the last 90 days. All 8 citations on record are historical. This suggests either the violation is now rare in the field or inspectors are interpreting the rule differently. If you've just been cited for 178.503, verify the citation details immediately—it may reflect a documentation or labeling issue specific to your shipment rather than a widespread enforcement trend.
Immediate steps:
Yes. The DataQs (Safety Management System Request for Reconsideration) process allows you and your carrier to formally contest roadside inspection findings. You have 90 days from the inspection date to file. DataQs challenges work best when the inspector made a factual error—for example, misidentified your cargo, did not perform the required check correctly, or recorded inaccurate details. If the violation reflects actual non-compliance with the regulation, a DataQs challenge is less likely to succeed. Submit through your carrier's FMCSA profile or work with your carrier's safety manager.
DUPUY OXYGEN AND SUPPLY CO INC (USDOT 573832) accounts for 3 of the 8 all-time citations for 178.503. Five other carriers have 1 citation each: PFS NITROGEN SERVICES LLC, LM TRANSPORTACIONES SA DE CV, BROWNE LABORATORIES INC, ABOUT LOGISTICS INC, and WATER WORKS GROUP INC. The concentration in oxygen and nitrogen transport reflects the nature of the violation. If you drive for one of these carriers, ask your safety manager what corrective action was taken after prior citations.
The severity weight for 178.503 is not provided in FMCSA public guidance, so the exact CSA point value varies by inspection circumstances. What we know: hazmat violations fall under the Hazardous Materials Safety BASIC category in CSA scoring, which affects both your driver record and your carrier's safety profile. Violations remain on your record for 36 months under CSA. Since 178.503 is rarely cited (0 in the last 12 months), a single citation is unlikely to trigger alerts, but your carrier's violations in this category do roll up to their CSA score.
178.503 addresses hazardous materials handling and documentation requirements under DOT regulations. Rather than a single piece of equipment or vehicle defect, it typically involves how you prepare, label, or document hazardous cargo. The extremely low citation volume (8 all-time) suggests it covers a narrow or technical aspect of hazmat compliance—possibly related to specific shipper responsibilities or emergency response information. Review the exact finding on your citation report and cross-reference it with your shipping papers and hazmat training records to pinpoint the issue.
TruckCodex aggregates official public-sector datasets. See the Source registry for dataset-level coverage and the Freshness log for last-import timestamps.
Census, SAFER, SMS, Licensing & Insurance (L&I), roadside inspections, crashes, and authority history.
Vehicle recall campaigns, defect investigations, and consumer safety complaints (SCRS).
Cross-border carrier registry and Canadian recall campaigns where applicable.
TruckCodex is an independent aggregator; it is not affiliated with FMCSA, NHTSA, EIA, or Transport Canada. Always verify compliance-critical information directly with the originating agency.