FMCSA · Safety Measurement System register · Iowa

Hazardous Materials Compliance in Iowa

• 361Violations recorded
• 25,803Registered carriers in the state
• 2,084State inspections addressing it

Packaging, placarding and handling of hazardous materials. Iowa carries 361 violations in this category, out of 42,552 recorded nationally, which places it 27 of 51 jurisdictions the register covers. Its share of the national figure is 0.008 as a fraction, banked by the build rather than turned into a ratio here. Nationally, a violation in this category carries an average severity weight of 4.5.

The state’s carriers by fleet size

• 1 power unit 13,594
• 2 to 5 power units 8,703
• 6 to 20 power units 2,156
• 21 to 100 power units 566
• 101 to 1,000 power units 106
• 1,000 or more power units 12

Other categories recorded in Iowa

• Controlled Substances/Alcohol 592
• Crash Indicator 3,675
• Driver Fitness 5,712
• Hours-of-Service Compliance 24,242
• Unsafe Driving 21,925
• Vehicle Maintenance 62,002

Hazardous Materials Compliance across every jurisdiction → Every category in Iowa →

Figures from the federal source files: EPA’s ECHO downloads, CMS provider files and the FMCSA census.

Counts from FMCSA SMS input files on data.transportation.gov: kjg3-diqy (Motor Carrier Census, 2,122,441 rows), rbkj-cgst (Inspection, 5,834,148), 8mt8-2mdr (Violation, 6,808,260), 4wxs-vbns (Crash, 255,582), p2mt-9ige (Out of Service Orders, 399,600); SoQL aggregates fetched 2026-09-16. The rank is taken over the jurisdictions this desk publishes, and the national figure beside it is the register’s own total for the category.