The 1005 placard is the diamond-shaped hazard warning that identifies anhydrous ammonia in transport. The number 1005 is the UN identification code assigned specifically to that chemical, and federal regulations under 49 CFR require the placard on each side and each end of any bulk container or vehicle carrying it so first responders can recognize the hazard on sight.1CAMEO Chemicals. UN/NA 1005
What the 1005 Placard Identifies
Anhydrous ammonia is ammonia in its pure, waterless form, shipped as a liquefied compressed gas held under high pressure in cargo tanks, rail cars, and farm nurse tanks. A release expands rapidly into a colorless gas with a sharp odor that can cause severe burns to the eyes, skin, and respiratory tract within seconds.
Under DOT rules, most domestic highway shipments are classed as UN1005, Division 2.2 (non-flammable gas) with an inhalation hazard designation. International movements and certain other conditions instead trigger Division 2.3 (poison gas), Toxic Inhalation Hazard Zone D, which brings stricter requirements including a Hazardous Materials Safety Permit for tanks larger than 3,500 gallons.2Federal Motor Carrier Safety Administration. Is Anhydrous Ammonia Covered Under the Hazardous Materials Safety Permit Program
The inhalation hazard designation applies either way. That can require a separate POISON INHALATION HAZARD placard on each side and each end, on top of the class placard.3eCFR. 49 CFR 172.505 – Placarding for Subsidiary Hazards A single load often needs more than one placard type.
When the 1005 Placard Is Required
The rules in 49 CFR 172.504 divide shipments into bulk and non-bulk. Any bulk packaging, cargo tank, or transport vehicle carrying any quantity of anhydrous ammonia must display placards on each side and each end. No minimum threshold applies to bulk containers. Even a nearly empty cargo tank still needs its placards up.4eCFR. 49 CFR 172.504 – General Placarding Requirements
For non-bulk packages moved by highway or rail, placards are not required when the total gross weight of all hazmat on the vehicle is under 1,001 pounds (454 kg). Cross that threshold and every placarding requirement applies in full. Because anhydrous ammonia almost always moves in bulk tanks, the 1005 placard is required on nearly every load.4eCFR. 49 CFR 172.504 – General Placarding Requirements
The Agricultural Nurse Tank Exception
Farmers and agricultural retailers get a narrow break. A privately operated nurse tank used exclusively for agriculture, holding 3,000 gallons or less and meeting specific construction and fill-density standards, qualifies for certain exemptions from the full Hazardous Materials Regulations packaging specs.5U.S. Department of Transportation / PHMSA. Nurse Tank Safety Advisory
On placarding specifically, a nurse tank does not need a placard on an end where valves, fittings, regulators, or gauges physically prevent it from being properly placed and visible.5U.S. Department of Transportation / PHMSA. Nurse Tank Safety Advisory The placard is still required on every other face.
How the Placard Must Look
The standard 1005 placard for Division 2.2 loads carries a green background with white lettering, white symbols, and a white inner border, matching the NON-FLAMMABLE GAS design.6eCFR. 49 CFR 172.528 – NON-FLAMMABLE GAS Placard The four digits 1005 sit at the center of the diamond so responders can identify the chemical before opening any paperwork.
Every placard must be diamond-shaped (a square turned 45 degrees) and measure at least 250 mm (about 9.84 inches) on each side, with a solid-line inner border roughly 12.5 mm in from the edge. The material has to survive 30 days of open-air exposure without significant deterioration, and the printed colors must pass a 72-hour fadeometer test. High-quality vinyl and heavy-grade tagboard (at least 176 pounds per ream) are the most common materials that meet those standards.7eCFR. 49 CFR 172.519 – General Specifications for Placards
Where to Place It and How to Keep It Visible
Placards go on each side and each end of the transport vehicle, freight container, or bulk packaging so the hazard is visible from any approach.4eCFR. 49 CFR 172.504 – General Placarding Requirements That means one on the front, one on the rear, and one on each lateral side. Beyond those four positions, several visibility rules apply:
- Each placard must sit at least 3 inches (76 mm) away from any advertising, logo, or other marking that could reduce its visibility.
- Placards cannot be hidden behind ladders, pipes, doors, or tarpaulins.
- As far as practical, mount placards where tire spray will not coat them with dirt or water.
- Any words or identification numbers must read left to right.
- The placard must be mounted against a contrasting background color, or carry a dotted or solid outer border that contrasts with the surface it is affixed to.
The driver is responsible for keeping placards legible throughout the trip. A placard caked in mud or partly peeled off can trigger an out-of-service order at a roadside inspection, sidelining the vehicle until it is fixed.8eCFR. 49 CFR 172.516 – Visibility and Display of Placards
Removing the Placard After Delivery
Displaying a 1005 placard on a vehicle that is not actually carrying anhydrous ammonia is itself a federal violation. No one may display a hazmat placard unless the vehicle is carrying the material and the placard accurately represents the hazard.9eCFR. 49 CFR 172.502 – Prohibited and Permissive Placarding
Once a container has been sufficiently cleaned of residue and purged of vapors to eliminate the hazard, the placards have to be removed, painted over completely, or securely covered so nothing about them remains visible.10Pipeline and Hazardous Materials Safety Administration. Interpretation 07-0201 A partially peeled placard still counts as displayed and still violates the rule. Leftover adhesive or backing after a proper removal does not. Until a tank is fully purged, it still qualifies as hazardous, and the placard stays up.
Mis-placarding also wastes emergency response. Crews seeing a 1005 will suit up in chemical-protective gear and set a perimeter before approaching, which takes time and pulls people from real calls.
Penalties for Placarding Violations
Federal hazmat law runs on two tracks: civil fines and criminal prosecution.
Someone who knowingly violates federal hazmat transportation rules faces a civil penalty of up to $75,000 per violation. When a violation causes death, serious illness, severe injury, or substantial property destruction, that cap rises to $175,000. Each day a violation continues counts as a separate offense, so costs mount fast for carriers that ignore the rules.11Office of the Law Revision Counsel. 49 USC 5123 – Civil Penalty PHMSA adjusts these statutory amounts for inflation periodically, so the figures actually enforced in a given year may be higher than the base statute.
Criminal penalties apply when a person willfully or recklessly violates the regulations. A conviction can bring a fine under Title 18 and up to five years in prison. If the violation causes a release that results in death or bodily injury, the maximum prison term doubles to ten years.12Office of the Law Revision Counsel. 49 USC 5124 – Criminal Penalty A “willful” violation means the person knew the relevant facts and knew the conduct was unlawful, so simple ignorance of a placarding rule generally does not, by itself, trigger criminal liability.
Who Can Drive a Placarded Load
A vehicle that requires a 1005 placard cannot be driven on a standard license. Transporting anhydrous ammonia in placardable quantities generally requires a commercial driver’s license with a hazardous materials endorsement. Getting the endorsement means passing a written knowledge test on hazmat transportation rules and completing a TSA security threat assessment that includes fingerprinting and a background check.
Agricultural operations have a limited alternative. Some states issue a restricted-use farm service CDL that does not require the hazmat endorsement, but it is seasonal and cannot be held at the same time as a full CDL. A driver who already holds a full CDL would have to surrender it to obtain the restricted version, which makes the restricted license impractical for anyone driving commercially year-round.