U.S. supermarket eggs may look as though another rinse would make them cleaner before they go into the refrigerator. It does not improve their safety: USDA specifically advises consumers not to wash commercially packaged eggs at home.
Store-bought U.S. eggs have already been washed
USDA-graded eggs are washed and sanitized by processors under controlled conditions using compounds permitted for food processing. The process controls water temperature so contaminated wash water is not drawn into the egg through pores in the shell.
Commercial washing removes the natural outer coating, often called the bloom or cuticle. USDA explains that processors commonly replace some protection with a light coating of edible mineral oil. The eggs then move through a refrigerated system.
Why washing them again can backfire
An eggshell is porous. If home wash water is cooler than the egg or otherwise creates unfavorable pressure conditions, water at the surface can be drawn inward. If the water or shell carries microorganisms, that is the opposite of what the wash was meant to accomplish.
Extra handling also creates more opportunities to crack a shell or spread contamination to hands, the faucet and the sink. A visually cleaner egg is not automatically a microbiologically safer egg.
What to do when you bring eggs home
USDA recommends putting eggs promptly in a refrigerator at 40 °F or below, keeping them in their original carton and storing them in the main body of the refrigerator rather than the door.
The carton protects against breakage, reduces odor pickup and keeps package dates and handling information with the eggs. The refrigerator door experiences greater temperature swings every time it is opened.
Take out only the eggs you plan to use. Letting the whole carton warm on the counter and then returning it to the refrigerator adds temperature cycling without improving safety. A steady cold chain is simpler and reduces condensation on the shell.
What if an egg looks dirty?
USDA recommends buying Grade A or AA eggs with clean, uncracked shells. If a commercial egg is unusually dirty or cracked, washing it at home is not the way to restore normal safety.
A cracked egg should not be purchased. If a shell cracks accidentally after purchase, handling depends on when and how the crack occurred; an egg of uncertain history should be discarded rather than rinsed and put back into long storage.
Should you wash it right before cracking?
USDA says washing commercially packaged eggs is unnecessary before use as well as before storage. Instead, focus hygiene on what actually becomes contaminated during preparation: wash hands, utensils, equipment and work surfaces with hot soapy water before and after contact with raw egg.
Crack eggs cleanly and avoid using the shell itself to move yolks back and forth when a recipe does not require it, because that creates more contact between the edible contents and the shell exterior.
Why advice looks different in Europe
European retail practice is not identical. EU Class A eggs are normally sold without industrial washing so their natural cuticle remains intact, whereas U.S. commercial eggs are washed before sale and then kept refrigerated.
Despite the different processing systems, the consumer takeaway converges: neither system treats casual home washing before storage as a useful safety step.
The key difference is where the controlled washing happens. In the United States it occurs before retail under specified conditions and is followed by refrigeration. At home, the sink provides neither the same process controls nor a benefit that justifies the extra handling.
The practical rule
Put U.S. store-bought eggs in the refrigerator, not under the faucet. They have already been commercially washed. Keep them cold at 40 °F or below, in the carton, and put your cleaning effort into hands and kitchen surfaces after handling raw egg.
Sources
- USDA FSIS — Shell Eggs from Farm to Table — Directly advises consumers not to wash eggs at home and explains commercial washing, sanitizing and refrigeration.
- USDA FSIS — Washing Food: Does it Promote Food Safety? — Explains that store eggs are already washed, the natural bloom is removed and extra home washing can increase cross-contamination risk.
- FDA — What You Need to Know About Egg Safety — Recommends buying clean, uncracked refrigerated eggs and storing them promptly at 40 °F or below.
- EUR-Lex — Commission Delegated Regulation (EU) 2023/2465 — Useful comparison: EU Class A eggs are normally not washed or cleaned before or after grading.