Hazmat road incident statistics infographic showing 119,346 U.S. highway hazmat incidents from 2021 to 2026, 87% highway share of all incidents, 50% flammable liquid involvement, and 2025 PHMSA penalty increases to $238,000 per violation, based on DOT PHMSA data.

Hazmat Road Incidents in the U.S.: 40+ Statistics Through 2025

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Hazmat Road Incidents in the U.S.: 40+ Statistics on Causes, Frequency, and Consequences Through 2025
Between April 2021 and April 2026, highway hazmat transport generated 119,346 reported incidents – far exceeding all other modes combined. Over 2 million hazardous material shipments move through U.S. roads every day. Flammable liquids account for half of all highway incidents, human error drives the majority of causes, and PHMSA civil penalties reached up to $238,000 per violation in 2025. This article compiles 40+ statistics from PHMSA, DOT, BTS, and FMCSA data through 2025.
40+ Statistics
PHMSA 2021-2026 Data
Causes and Consequences
2025 Regulatory Updates
119K+
Highway hazmat incidents reported April 2021 through April 2026 – more than all other transport modes combined
Trace One / DOT data, 2026
2M+
Hazardous material shipments moving through U.S. roads every single day
PHMSA / CBS News, 2023
$238K
Maximum PHMSA civil penalty per hazmat violation in 2025 – up from prior years with fines now starting at $617
ICC Compliance Center, April 2025

Hazardous materials are everywhere on U.S. roads – in tankers, in freight containers, in packages stacked on flatbeds, and in everyday consumer deliveries that shippers fail to declare. Over 2 million hazmat shipments move through American highways every day. Most arrive safely. But when they do not, the consequences range from minor spills to fires, explosions, environmental contamination, and deaths. The pattern of where these incidents happen and why they happen is well documented by PHMSA – and the numbers tell a consistent story.

Highway transport dominates hazmat incident data by a significant margin, accounting for the vast majority of all reported incidents and damages across every mode of U.S. transportation. Flammable liquids are involved in half of all incidents. Human error drives the majority of causes. And the regulatory environment tightened further in 2025, with PHMSA raising maximum civil penalties and new rules addressing lithium battery transportation risks. Below we have compiled 40+ statistics on U.S. road hazmat incidents from PHMSA, BTS, DOT, and FMCSA sources, updated through 2025.

Editor's Choice: Key U.S. Hazmat Road Incident Statistics

87%
of all reported hazmat incidents occur on highways – and highway shipments generate 86% of all reported hazmat damages across all transport modes. (Labelmaster / PHMSA data)
50%
of all highway hazmat incidents in Q1 PHMSA data involved Hazard Class 3 – Flammable Liquids, which also accounted for 49% of all associated damages. (Labelmaster / PHMSA)
21K+
hazmat incidents reported annually across all modes by 2020, up from approximately 15,000 per year a decade earlier – a 40% increase driven largely by highway shipment growth. (ICC Compliance Center / PHMSA, 2022)
1,500
transportation incidents occur every year when hazardous materials are shipped undeclared – a persistent compliance failure tracked by PHMSA’s Check the Box campaign since 2019. (PHMSA, Q1 2024)
85%+
of reported U.S. road hazmat incidents involve truck transportation – reflecting the dominance of highway freight in moving hazardous commodities across the country. (PHMSA / FMCSA)
164K+
hazmat incidents involving non-bulk packaging over the 2011-2020 decade, versus 15,743 in bulk packaging – showing that everyday small-package hazmat is a larger incident driver than tanker and bulk transport. (ICC Compliance Center / PHMSA)

1. Scale of Hazmat Transportation on U.S. Roads

Highway vs. Other Transport Modes: Hazmat Incidents April 2021 to April 2026
Highway
119,346 incidents
Air
8,106
Rail
1,684
Water
37
Source: Trace One analysis of U.S. DOT PHMSA data (April 2026)
  • Between April 2021 and April 2026, highway transport generated 119,346 hazmat incidents – compared to 8,106 by air, 1,684 by rail, and just 37 by water. Highways dominate the incident picture by every measure. (Trace One analysis of DOT data, April 2026)
  • Over 2 million hazardous material shipments move through U.S. roads every day, according to former PHMSA deputy associate administrator Bob Richard – making highway exposure orders of magnitude larger than any other mode. (CBS News / PHMSA, 2023)
  • Highway incidents represent 87% of all reported hazmat incidents and generate 86% of all reported damages across air, highway, rail, and water transport. (Labelmaster / PHMSA incident data)
  • Annual hazmat incidents across all modes climbed from approximately 15,000 per year in 2011 to over 21,000 by 2020 – a 40% increase over the decade, driven primarily by growth in highway freight volume. (ICC Compliance Center analysis of PHMSA data, 2022)
  • Truck transportation accounts for over 85% of all reported U.S. road hazmat incidents, reflecting the structural dominance of highway freight in the hazardous materials supply chain. (PHMSA / FMCSA)

2. Most Common Hazardous Materials in U.S. Road Incidents

Class 3 – Flammable Liquids
50% of highway incidents. Includes gasoline, fuel oil, ethanol, and paint. Paint is the single most commonly spilled hazmat commodity on U.S. roads. 49% of damages.
Class 2.1 – Flammable Gas
3% of incidents but 20% of damages – an outsized financial impact reflecting the severity of compressed gas releases and explosion risks when containers are breached.
Corrosives
A major category alongside flammable liquids in the 2021-2026 dataset. Can damage road surfaces, vehicles, and cause severe burns on contact. Heavily represented in non-bulk packaging incidents.
Lithium Batteries (Class 9)
Emerging risk category. PHMSA Final Rule HM-215Q (effective April 2025) updated regulations. CVSA recommends CDL hazmat endorsement for lithium battery drivers due to fire risk during thermal runaway.
  • Flammable liquids (Hazard Class 3) account for 50% of all highway hazmat incidents and 49% of all related damages – the dominant material category by both frequency and financial impact. (Labelmaster / PHMSA Q1 data)
  • The single most commonly spilled hazmat commodity on U.S. roads is paint, followed by fuel oil for home heating – a reminder that many high-frequency hazmat incidents involve everyday commercial products, not exotic industrial chemicals. (CBS News interview with former PHMSA official Bob Richard, 2023)
  • Flammable non-toxic gas (Class 2.1) represents only 3% of incidents but 20% of all damages, reflecting that compressed gas releases produce the most costly individual incidents even when relatively rare. (Labelmaster / PHMSA)
  • Corrosives and flammable liquids together make up the majority of hazmat transit incidents in the 2021-2026 five-year dataset, concentrated along heavily traveled roadways through densely populated areas. (Trace One analysis of DOT data, 2026)
  • Lithium batteries are classified as Class 9 dangerous goods under 49 CFR and are increasingly regulated after a pattern of thermal runaway fires during highway transport. PHMSA’s HM-215Q final rule (effective April 10, 2025) updated packaging, labeling, and state-of-charge requirements. (PHMSA / Hazmat University, 2024-2025)
  • Over the 2011-2020 decade, 164,789 incidents involved non-bulk packaging compared to 15,743 in bulk – confirming that small-package hazmat shipments generate far more incidents than tanker or bulk transport. (ICC Compliance Center / PHMSA, 2022)

3. Causes of Hazmat Road Incidents: Human Error, Crashes, and Packaging

Human Error (No.1 cause)
Vehicle Crashes (60%+ of serious incidents)
Packaging Failures
Equipment Failure
Environmental Factors
Undeclared Shipments (~1,500/yr)
Sources: PHMSA incident data; CBS News (2023); PHMSA Check the Box campaign (2024)
  • Human error is the number one cause of hazmat road incidents, according to PHMSA data analysis – including improperly secured loads, poorly closed container valves, inaccurate labeling, and failure to follow packaging and marking requirements. (CBS News / former PHMSA official Bob Richard, 2023)
  • In over 60% of serious hazmat incidents, a vehicle collision was the triggering event – meaning that general highway safety (following distance, speed, driver distraction) directly determines hazmat incident probability. (PHMSA incident analysis)
  • Approximately 1,500 transportation incidents occur annually when hazardous materials are shipped undeclared – packages that were not properly identified or declared by the shipper, creating unknown risks for carriers and emergency responders. (PHMSA Check the Box campaign, Q1 2024)
  • Packaging failures are the second most preventable cause category – improper packaging, damaged containers, or containers inadequate for road vibration and impact result in material release before the vehicle is even involved in a crash. (PHMSA incident data)
  • Equipment failure including brake failure, leaking hoses, and faulty tank seals causes a significant share of incidents – a risk that increases with the age of the vehicle fleet and the intensity of long-haul trucking cycles. (PHMSA/FMCSA)
  • Many hazmat transit incidents stem from preventable paperwork and documentation failures – incomplete shipping papers, outdated classifications, or missing safety data sheets – that leave emergency responders without critical information during an incident. (Trace One, 2026)

4. Fatalities, Injuries, and Financial Consequences of Hazmat Road Incidents

60
Fatalities from hazmat incidents 2011-2015 (nearly all on highways)
ICC / PHMSA, 2022
34
Fatalities from hazmat incidents 2016-2020 – a declining trend, but almost entirely from highway events
ICC / PHMSA, 2022
5%
of reported hazmat incidents involve significant damage, injury, or death
PHMSA / FMCSA
$41M+
Damages from in-transit highway hazmat accidents in a single year (2013 data), versus $4M in unloading phase
PHMSA / Jason R. Schultz P.C.
  • From 2011-2015, hazmat transportation incidents caused 60 fatalities; this declined to 34 fatalities from 2016-2020. Nearly all hazmat fatalities over the entire decade occurred on highways. (ICC Compliance Center / PHMSA portal data, 2022)
  • Approximately 5% of all reported hazmat incidents involve significant damage, injury, or death – meaning the vast majority are minor spills or packaging failures. But within that 5%, the consequences can be catastrophic. (PHMSA / FMCSA)
  • In-transit highway hazmat accidents generated over $41 million in damages in 2013 alone, far exceeding the $4 million in damages from the unloading phase and $2.5 million from loading. The transit phase is where exposure and financial risk concentrate. (PHMSA via Jason R. Schultz P.C.)
  • Fires and explosions occur in less than 2% of hazmat road incidents, but they represent the most severe outcome category – producing the highest fatality, injury, and property damage figures. (PHMSA incident data)
  • Human health consequences include burns, respiratory damage from inhalation, chemical poisoning, and death. First responders arriving at hazmat scenes without accurate material information face compounded risk, which is why undeclared shipments are treated as a serious enforcement priority by PHMSA. (PHMSA safety programs)
  • Environmental consequences from hazmat spills include soil contamination, waterway pollution, and air quality impacts that can persist for years after the incident and trigger Superfund-level cleanup obligations. (EPA / PHMSA)

5. Geographic Distribution: States and Corridors With Highest Hazmat Exposure

High-Density Urban Corridors
Hazmat incidents concentrate along heavily traveled roadways through densely populated areas. Urban freight corridors serving major manufacturing, energy, and distribution hubs carry the highest incident risk.
Industrial State Concentration
Trace One’s state-by-state analysis of the 2021-2026 dataset reveals significant variation in incidents per 100,000 residents across all 50 states, with industrial freight states recording the highest absolute incident counts.
Community Impact Zone
As more hazardous materials move through communities on expanding logistics networks, spills, fires, and exposure events lead to road closures, evacuations, environmental contamination, and disruptions to local economies.
  • Hazmat incident risk is concentrated along heavily traveled roadways through densely populated areas – the same corridors that carry the highest freight volumes also carry the highest exposure for communities along the route. (Trace One, 2026)
  • The expanding U.S. logistics landscape – driven by industrial output growth and increased freight movement – means more hazardous materials are moving through more communities than at any prior point, raising the public impact potential of each incident. (Trace One, April 2026)
  • Spills, fires, and exposure events commonly produce road closures, evacuations, environmental contamination, and disruptions to local economies – consequences that extend well beyond the immediate incident site. (Trace One / DOT, 2026)
  • In Georgia alone, there were 553 hazmat incidents involving highway transportation in 2013 (one state in one year), illustrating the scale of the exposure at the state level even in years with no major catastrophic events. (PHMSA state data via Jason R. Schultz P.C.)

6. 2025 Regulatory Updates: PHMSA Penalties, HM-215Q, and Lithium Battery Rules

$617
Minimum PHMSA civil penalty per hazmat violation in 2025
ICC Compliance Center, April 2025
$238K+
Maximum penalty per violation, with higher amounts for cases involving injury or significant damage
PHMSA / Trace One, 2025
Apr 2025
Compliance deadline for PHMSA Final Rule HM-215Q – updated lithium battery transport requirements under 49 CFR
PHMSA / Hazmat University, 2024
  • PHMSA raised maximum civil penalties effective in 2025 to fines ranging from $617 to over $238,000 per violation, with substantially higher penalties where injury or significant damage occurred – a significant escalation from prior penalty structures. (ICC Compliance Center Q1 2025; Trace One, 2026)
  • PHMSA Final Rule HM-215Q became fully enforceable on April 10, 2025, harmonizing U.S. hazmat regulations with international standards including the 2025-26 ICAO Technical Instructions, the 2024 IMDG Code, and the 23rd revised UN Model Regulations. (PHMSA; Hazmat University, 2024)
  • HM-215Q introduced updated lithium battery transport requirements including new state-of-charge provisions, revised emergency response information requirements for UN 3536 shipments, and new sodium-ion battery classifications. (PHMSA / Lion Technology, February 2026)
  • The Commercial Vehicle Safety Alliance (CVSA) recommended in April 2025 that PHMSA require CDL hazmat endorsements for drivers transporting lithium batteries at placarding thresholds – a proposal reflecting growing concern over thermal runaway fires during highway transport. (CVSA letter to PHMSA Acting Administrator, April 2025)
  • The U.S. is currently the only country that does not require Class 9 materials to be placarded, and CVSA has specifically recommended amending this exception to exclude lithium battery shipments – a regulatory gap with direct highway safety implications. (CVSA, April 2025)
  • PHMSA’s 2025 proposed rule (comment period ending April 13, 2026) would further align U.S. hazmat regulations with international standards by expanding state-of-charge restrictions for lithium and sodium-ion batteries transported by air and adding new Hazardous Materials Table entries. (PHMSA / Lion Technology, 2026)

7. Hazmat Road Incident Prevention: What the Data Supports

Driver and Handler Training
Mandatory under 49 CFR Part 172 Subpart H for any employee who directly affects hazmat transportation safety. Training must include general awareness, function-specific, safety, and security components – and must be repeated every 3 years.
Accurate Classification and Declaration
With 1,500 undeclared hazmat incidents per year, proper identification before shipment is the single most directly preventable failure in the data. PHMSA’s Check the Box campaign specifically targets this gap.
Packaging Integrity
SDS management software and standardized hazard communication reduce documentation errors. UN-specification packaging and proper closure verification before transit directly address the packaging failure cause category.
Vehicle Maintenance
Equipment failure causes a meaningful share of incidents. FMCSA regulations require pre-trip inspections for hazmat carriers. Brake system integrity, tank seal condition, and hose inspection are the highest-priority maintenance items.
  • Hazmat shipper training is required by law under 49 CFR Part 172 Subpart H for any employee who directly affects hazmat transportation safety. This includes drivers, loaders, handlers, and documentation staff – not only the driver of the vehicle. (PHMSA; Lion Technology)
  • Industry stakeholders increasingly point to SDS management software and digital compliance tools as effective ways to reduce documentation errors, standardize hazard communication, and lower the likelihood of violations during transit. (Trace One, April 2026)
  • Because over 60% of serious incidents are triggered by vehicle collisions, general safe driving practices for hazmat carriers – extended following distances, reduced speeds, route planning to avoid high-risk times and corridors – directly reduce hazmat incident probability. (PHMSA incident analysis)
  • The Check the Box campaign has been running since 2019 specifically to address the 1,500 annual undeclared hazmat incidents – targeting shippers who unknowingly or negligently fail to identify hazardous materials before tendering them to carriers. (PHMSA Q1 2024 newsletter)

Key Takeaways for Safety Managers and Hazmat Compliance Professionals

Highway is where hazmat risk lives
119,346 highway incidents between 2021-2026 against 1,684 for rail and 37 for water. For safety managers in logistics, manufacturing, and transport, highway hazmat exposure is not one risk among many – it is the dominant risk by a factor of more than 70 to one over rail.
Human error is the primary prevention target
The number one cause of hazmat incidents is documented as human error – and 1,500 incidents per year involve undeclared shipments. Both are addressable through training, compliance systems, and documentation verification before shipment, not after an incident.
Flammable liquids dominate – but non-bulk packaging is where volume hides
50% of highway incidents involve flammable liquids, and paint is the most commonly spilled commodity. But 164,000 non-bulk incidents versus 15,000 bulk incidents over a decade shows that everyday small-package hazmat compliance failures generate more incidents than tanker transport does.
Penalties escalated significantly in 2025
PHMSA civil penalties now range from $617 to over $238,000 per violation. Organizations that treat hazmat compliance as a documentation exercise rather than an operational priority face substantially higher financial exposure than in prior years.
Lithium battery risk on highways is growing and underregulated
The U.S. is the only country not requiring Class 9 placarding, and CVSA recommended in 2025 that drivers transporting lithium batteries obtain hazmat CDL endorsements. Organizations shipping or transporting battery products should not assume current Class 9 exceptions eliminate compliance obligations.
Training is mandatory and must be current
49 CFR requires hazmat training for all employees who directly affect transportation safety – renewed every 3 years. HM-215Q (effective April 2025) changed requirements for lithium batteries, sodium-ion batteries, and other materials. Training that was current before April 2025 may no longer be compliant.

Sources

Government and Regulatory Sources

Industry and Research Sources

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