Grain Traceability

Grain traceability is tracking wheat and other grains from farm and elevator through milling to flour lots and finished goods, so a contaminated flour lot can be linked to its source and pulled from the market.

  • Food safety
  • Rules, recalls & traceability

Grain traceability follows cereal grains such as wheat through each handoff: farm, elevator, mill, flour lot, bakery and store. Elevators often blend shipments to get a uniform quality, so tracing bulk grain usually leads back to an elevator and a handful of farms rather than one field. From the mill onward, tracing depends on flour lot or date codes and on each business's receiving and shipping records. Grain bought under USDA's official inspection system also comes with certificates that describe its grade, class and condition and that serve as legal documents.

Flour is a raw food. Grain can pick up bacteria in the field or during milling, and turning it into flour does not kill those germs. FDA and CDC have linked raw flour and raw dough to outbreaks of E. coli and Salmonella. In 2016, flour packages saved in sick people's homes helped investigators tie illnesses to one week of production at a single mill. In 2023, a flour recall was defined by specific 'Better if Used by' dates, showing how much depends on readable codes.

Key facts

2016 flour outbreak (E. coli)
63 ill in 24 states, 17 hospitalized
2023 flour outbreak (Salmonella)
14 ill in 13 states; recall announced April 28, 2023
Milling and germs
Grinding grain into flour does not kill bacteria
Bulk grain tracing depth
Usually back to an elevator and a handful of farms

In a bakery or commercial kitchen

  • Record the mill, brand, lot or date code and delivery date for every flour shipment you receive
  • Write the flour lot code on each batch sheet so finished goods can be tied back to the flour used
  • Ask suppliers whether flour has been treated to kill germs before using it in anything that will not be baked
  • Never serve raw dough or batter; CDC advises restaurants not to serve it
  • When buying whole grain, ask for official inspection results, which can cover moisture, insects, foreign material and aflatoxin

For home and cottage bakers

  • Keep flour in its original bag, or write the brand and date code on your storage container
  • Compare your flour's brand, size and date code with any recall notice, and throw it out if you cannot tell
  • Do not taste raw flour, dough or batter, and keep children away from play clay made with raw flour

Related entries

Sources

Written by VanillaGoods in our own words from these sources. Last reviewed October 17, 2026.

  1. Flour Is a Raw Food and Other Safety Facts, U.S. Food and Drug Administration
  2. Multistate Outbreak of Shiga toxin-producing Escherichia coli O121 Infections Linked to Flour (Final Update), Centers for Disease Control and Prevention (archive)
  3. Outbreak Investigation of Salmonella: Flour (April 2023), U.S. Food and Drug Administration
  4. Food Traceability: One Ingredient in a Safe and Efficient Food Supply, USDA Economic Research Service, Amber Waves
  5. Official Grain Inspection & Weighing System, USDA Agricultural Marketing Service, Federal Grain Inspection Service