Trailer Washout: The Rule Never Says How Often

The federal food transport rule sets an outcome, not an interval, and four of the carrier's six duties are paperwork. Here is what 21 CFR subpart O actually puts on you.

Trailer Washout: The Rule Never Says How Often

Every driver who hauls food has been handed a washout ticket and wondered what it is actually for. The rule behind it is federal, it has a number, and most of what people believe about it is not in the text.

Where the rule lives

It is the Sanitary Transportation of Human and Animal Food rule, 21 CFR part 1, subpart O. It applies to shippers, receivers, loaders and carriers in food transportation operations, whether or not the food crosses a state line.

The core requirement is in § 1.906: vehicles and transportation equipment must be designed and built so they are adequately cleanable for their intended use, and must be kept in sanitary condition so the food they carry does not become unsafe.

The part that surprises people: there is no frequency

The rule never says "wash the trailer every X loads" or "every Y days." It sets an outcome — equipment that does not make the food unsafe — and leaves the method to written procedures.

So when a shipper hands you a cleaning interval, that number is coming from their specifications or your contract, not from the regulation. It is still binding on you if you agreed to it. It is just not the government's number.

What the carrier is actually on the hook for

Under § 1.908(e), the carrier's duties kick in when there is a written agreement with the shipper making the carrier responsible for sanitary conditions. In that case the carrier must:

  • Meet the shipper's specifications for the vehicle and equipment.
  • Pre-cool each mechanically refrigerated compartment as the shipper specified, before offering the trailer for temperature-controlled food.
  • Show temperature performance if the shipper or receiver asks — ambient readings at loading and unloading, or time/temperature data from the trip.
  • Identify the previous cargo in a bulk vehicle, if the shipper asks.
  • Describe the most recent cleaning of that bulk vehicle, if the shipper asks.
  • Have written procedures for cleaning, sanitizing when necessary, and inspecting the equipment.

Read that list again. Four of the six are documentation. The washout is the easy part; being able to say what you washed, when, and what was in there before is the part that fails an audit.

Keep the paper for twelve months

Section § 1.912 sets the clock. Carriers keep the written procedures for 12 months beyond the period they are in use, and training records for 12 months after the person stops doing that job. Records have to be produced promptly on oral or written request — there is no "let me dig it up next week."

Originals, true copies or electronic records all count. A photo of a signed washout ticket is a true copy.

Training is a requirement, not a courtesy

Under § 1.910, when that written agreement makes the carrier responsible, the carrier has to train the people doing the work — on hiring and as needed after — and keep records with the date, the type of training and who was trained.

Who is exempt

A "non-covered business" is one with less than $500,000 in average annual revenue, adjusted for inflation, on a rolling three-year basis. Separately, a motor carrier that is not also a shipper or receiver counts as a small business under $27,500,000 in annual receipts, which affects compliance dates rather than granting a pass.

Being small does not make the food safe by itself. It changes which paperwork the government expects from you, not whether your customer can refuse the load.

What to do with this

  • Read your contract before you read the regulation. The interval you are being held to almost certainly comes from there.
  • Keep washout tickets photographed and dated. Twelve months, minimum, and findable in minutes.
  • Know your last bulk load. If a shipper asks and you cannot answer, that is a business problem before it is a legal one.
  • Write the procedure down once. The rule wants a written procedure, not a good habit.

A clean trailer over a tired chassis still fails a roadside. The mechanical half is worth the same free look: The Truck Savers runs a +100 point inspection at no charge and with no appointment.

Original source

eCFR — 21 CFR Part 1, Subpart O: Sanitary Transportation of Human and Animal Food