Food handlers prevent contamination by controlling five core areas: personal hygiene, temperature management, cross-contamination, proper cleaning, and staying home when sick. Every one of these has specific, measurable standards set by the FDA Food Code. Here’s what each looks like in practice.
Wash Your Hands the Right Way
Handwashing is the single most important thing food handlers do to stop contamination. The required scrub time is 20 seconds, which is longer than most people think. Wet your hands with clean water first (warm or cold works equally well), apply soap, then scrub your palms, the backs of your hands, between your fingers, and under your fingernails for the full 20 seconds. Rinse, then dry with a paper towel or air dryer.
You need to wash your hands before handling food, after touching raw meat or eggs, after using the restroom, after sneezing or coughing, after handling garbage, and after touching your face or hair. Gloves are not a substitute for handwashing. You wash before putting gloves on and again every time you change them.
Follow Personal Hygiene Standards
Beyond handwashing, food handlers are expected to meet specific grooming and clothing requirements. Fingernails must be clean, trimmed short, and free of nail polish or artificial nails. The exception: you can wear polish or artificial nails if you wear intact gloves during all food preparation. The concern is that chipped polish or a loose nail tip can fall into food without anyone noticing.
Hair restraints are required at all times when working with food. Acceptable options include hairnets, caps, scarves, and visor hats. Long hair must be tucked fully underneath. Facial hair and beards need a beard restraint. Headbands and ponytails alone don’t count.
Jewelry on the hands and arms is restricted to a plain wedding band and medical alert jewelry. Rings with stones, bracelets, and watches can harbor bacteria in crevices that handwashing can’t reach, and they also pose a physical contamination risk if a small piece breaks off into food.
Stay Out of the Kitchen When Sick
Six pathogens cause the vast majority of foodborne illness outbreaks linked to food workers: Norovirus, Salmonella typhi, non-typhoidal Salmonella, E. coli (STEC), Shigella, and Hepatitis A. Food handlers who are diagnosed with any of these, or who are experiencing symptoms associated with them, are required to report it to their manager and be excluded from work.
The symptoms that trigger exclusion are:
- Vomiting
- Diarrhea
- Jaundice (yellowing of the skin or eyes)
- Sore throat with fever
- Infected cuts or burns that have pus
This isn’t optional. A single infected food handler can contaminate hundreds of meals in a shift. Norovirus alone is extraordinarily contagious, and even a small amount of the virus transferred from hands to food can sicken customers.
Keep Food Out of the Danger Zone
Bacteria multiply fastest between 41°F and 135°F (5°C to 57°C). This range is called the temperature danger zone, and minimizing the time food spends in it is one of the most effective ways to prevent contamination. Cold foods need to stay at 41°F or below. Hot foods need to stay at 135°F or above.
Cooling leftovers is where many kitchens slip up. The FDA requires a two-stage cooling process. First, bring hot food from 135°F down to 70°F within two hours. Then continue cooling it from 70°F to 41°F or below within the next four hours. That gives you a total of six hours, but the first stage is the critical one because bacteria grow most aggressively in the upper part of the danger zone. Shallow pans, ice baths, and stirring all help speed cooling.
Cook to the Right Internal Temperature
Color and texture aren’t reliable indicators of doneness. A food thermometer is the only way to confirm safety. The minimum internal temperatures vary by protein:
- Poultry (chicken, turkey, duck, including ground poultry and stuffing): 165°F (74°C)
- Ground meat (beef, pork, veal, lamb): 160°F (71°C)
- Fish (salmon, tuna, cod, and other whole or fillet fish): 145°F (63°C), or until the flesh is opaque and flakes easily
- Casseroles (meat or meatless): 165°F (74°C)
Insert the thermometer into the thickest part of the food, away from bone, fat, or gristle. For thin items like burger patties, insert it sideways through the edge to reach the center.
Prevent Cross-Contamination
Cross-contamination happens when bacteria from raw food transfer to ready-to-eat food, usually through shared surfaces, utensils, or dripping juices. The most important rule: never use the same cutting board, knife, or container for raw meat and then for food that won’t be cooked, unless you’ve washed and sanitized it between uses.
In the refrigerator, storage order matters. Foods are arranged top to bottom based on the temperature they need to reach during cooking, with the highest-risk items on the lowest shelves:
- Top shelf: Ready-to-eat foods (salads, fruit, cooked leftovers)
- Second shelf: Ready-to-eat deli meats
- Third shelf: Raw seafood and lamb (cooked to 145°F)
- Fourth shelf: Raw beef, veal, and pork (cooked to 145°F)
- Fifth shelf: Ground meats and shell eggs (cooked to 155–160°F)
- Bottom shelf: Raw poultry (cooked to 165°F)
This hierarchy ensures that if something drips, it won’t contaminate food that requires a lower cooking temperature or no cooking at all.
Thaw Food Safely
Never thaw food on the counter at room temperature. The outer layers of the food will enter the danger zone long before the center has thawed, giving bacteria hours to multiply. There are three safe methods:
- In the refrigerator: The slowest method but the safest. Plan ahead, as large items can take a full day or more.
- Under cold running water: Submerge the food in cold water and change the water every 30 minutes if not using a continuous stream. Cook immediately after thawing.
- In the microwave: Use the defrost setting, but cook the food immediately afterward because some areas may have already begun cooking and entered the danger zone.
Clean and Sanitize Surfaces Properly
Cleaning and sanitizing are two separate steps. Cleaning removes visible food and grease. Sanitizing kills the bacteria that remain on a surface that looks clean. Skipping either step makes the other less effective, because sanitizer can’t penetrate a layer of food residue, and a wiped-down surface still harbors invisible pathogens.
The standard process for food contact surfaces is: wash with soap and water, rinse, then apply a sanitizing solution and let it air dry. The most common sanitizers used in food service and their required concentrations are:
- Chlorine bleach (unscented): 50 to 200 parts per million (ppm)
- Quaternary ammonium: 200 to 400 ppm
- Iodine: 12.5 to 25 ppm
Test strips matched to your specific sanitizer are required to verify the concentration is within the effective range. Too little won’t kill bacteria. Too much can leave chemical residue on food contact surfaces. All working containers of sanitizer must be clearly labeled with the product name.