Home · DVIR Guides · States · Iowa
Last reviewed November 12, 2026.
This page summarizes what we could verify from official sources about how Iowa applies driver vehicle inspection and related vehicle-inspection rules. It is not a complete reprint of Iowa law.
Interstate operations
If you operate a commercial motor vehicle in interstate commerce to, from, or through Iowa, the federal Motor Carrier Safety Regulations (FMCSRs) apply, including 49 CFR Part 396 and the DVIR rules in § 396.11 and § 396.13. State rules do not replace those federal interstate requirements. Start with What a DVIR is and who must complete one.
State agency
For Iowa-specific questions, including how the rules apply to operations that stay entirely inside Iowa, contact Iowa Department of Public Safety.
What official sources say about state adoption
The official Iowa Administrative Code, 661—22.1(321), states that the Department of Public Safety adopts the Federal Motor Carrier Safety Regulations, 49 CFR Parts 385, 386, and 390–399 (October 1, 2025). Copies may be reviewed through the official text or at www.fmcsa.dot.gov.
Operators of commercial vehicles, as defined in Iowa Code section 321.1, are subject to those adopted regulations unless exempted under Iowa Code section 321.449. Operators of commercial vehicles subject to the adopted rules must, at the time of application for authority to operate in Iowa or upon receipt of their Iowa registration, declare knowledge of the adopted federal regulations.
Intrastate operations and variations
The official adoption therefore includes Part 396. The exact vehicles covered, and any exemptions, depend on the Iowa Code definitions in section 321.1 and the exemptions in section 321.449. This page does not restate those code sections because we did not independently quote their full current text in this review. Read sections 321.1 and 321.449 and confirm with the Iowa Department of Public Safety.
What we could not independently verify from official sources in this review:
- The current full text of Iowa Code §§ 321.1 and 321.449 (commercial vehicle definition and exemptions) as they affect who must follow adopted Part 396 rules, including any DVIR-specific exception.
Please confirm those points with the state agency linked on this page before relying on them.
Related federal guides
Sources
- Iowa Administrative Code, Chapter 661.22 (official Legislative Services Agency PDF, including amendments effective June 17, 2026)
- Iowa Department of Public Safety
Need a printable form? DVIR.io offers free FMCSA-aligned PDF templates, including post-trip, pre-trip, bus and motorcoach, and intermodal reports.
Get the free DVIR templatesThis page is general information only. It is not legal advice, and it is not advice on any specific DVIR or vehicle-inspection requirement. Rules can change, and how they apply depends on your operation, your vehicles, and your location. Get advice in your own area on your specific state and federal requirements. If you have a question for DVIR.io, use the contact form.