Why Handwashing Is the Most Important Food Safety Practice

Proper handwashing is consistently cited by the FDA, CDC, and WHO as the single most effective way to prevent the spread of foodborne illness. The CDC estimates that proper handwashing could prevent approximately 50% of all foodborne illness outbreaks linked to food workers. Despite its simplicity, improper handwashing remains one of the most common critical violations found during health inspections.

Your hands come into contact with countless surfaces throughout the day — door handles, phones, aprons, raw food, cleaning supplies, and more. Each contact can transfer harmful bacteria, viruses, and other pathogens. Without thorough handwashing, these pathogens transfer directly to the food you prepare and serve.

The 6-Step Handwashing Process for Food Handlers

The FDA Food Code specifies a precise handwashing procedure that all food handlers must follow. Here are the six essential steps:

Step 1: Wet Your Hands with Warm Running Water

Use clean, warm running water (at least 100°F / 38°C). Warm water is more effective than cold water at activating soap and loosening oils on the skin. Turn on the faucet and thoroughly wet both hands and wrists under the stream of water.

Step 2: Apply Soap

Apply enough liquid soap to create a good lather. Bar soap is not recommended in food service settings because it can harbor bacteria between uses. Liquid soap dispensers should be properly maintained and refilled regularly.

Step 3: Scrub for at Least 20 Seconds

This is the most critical step and the one most often performed incorrectly. Vigorously scrub all surfaces of your hands for a minimum of 20 seconds. Focus on:

• Palms and backs of hands
• Between all fingers
• Under fingernails (use a nail brush if available)
• Thumbs (often missed)
• Wrists and lower forearms
• Fingertips

A helpful timing method is to sing “Happy Birthday” twice — this takes approximately 20 seconds.

Step 4: Rinse Thoroughly Under Clean Running Water

Rinse all soap and loosened contaminants from your hands under clean running water. Hold your hands with fingers pointing downward so that water flows from wrists to fingertips, carrying contaminants away from clean areas.

Step 5: Dry Hands with a Single-Use Paper Towel or Air Dryer

Dry your hands completely using a single-use paper towel or a warm-air hand dryer. Wet hands transfer bacteria up to 1,000 times more easily than dry hands. In food service, single-use paper towels are preferred because they also provide a barrier for the next step. Cloth towels are not acceptable because they can harbor and spread bacteria.

Step 6: Use a Paper Towel to Turn Off the Faucet

Use your paper towel to turn off the faucet handle, which you touched with dirty hands before washing. Then use the paper towel to open the restroom door if applicable. Dispose of the paper towel in a trash receptacle. This final step prevents recontamination of your clean hands.

When Must Food Handlers Wash Their Hands?

The FDA Food Code requires food handlers to wash hands in the following situations:

• Before starting work and before putting on gloves
• After using the restroom
• After touching raw meat, poultry, fish, or eggs
• After sneezing, coughing, or blowing your nose
• After eating, drinking, or smoking
• After touching your hair, face, or body
• After handling garbage or waste
• After cleaning tables, equipment, or other surfaces
• After handling chemicals or cleaning supplies
• After touching anything that could contaminate hands (phones, door handles, money)
• When switching between different food tasks (e.g., handling raw chicken then preparing salad)

The 20-Second Rule: Why Duration Matters

Research shows that washing hands for less than 20 seconds fails to remove most transient bacteria. A quick rinse under water without soap removes almost no pathogens. Even a 10-second wash with soap misses a significant percentage of bacteria. The 20-second minimum provides enough friction and contact time for soap to break down the oils and biofilms that trap bacteria on your skin.

Common Handwashing Mistakes

• Not washing long enough: Studies show the average person washes for only 6 seconds. Always count to 20 or use a timing method.
• Skipping fingertips and nails: Bacteria concentrate under fingernails and on fingertips. Scrub these areas deliberately.
• Using hand sanitizer as a substitute: Hand sanitizer is not a replacement for handwashing in food service. It can be used as an additional step after washing, but never instead of washing.
• Forgetting to wash between tasks: Switching from raw protein prep to salad assembly requires handwashing, even if you wore gloves for both tasks.
• Washing in food prep sinks: Food handlers must use designated handwashing sinks, not food prep sinks or utility sinks.

Handwashing on the Food Handler Exam

Handwashing is one of the most heavily tested topics on every food handler certification exam. Expect questions about the correct steps, the 20-second rule, when hands must be washed, and common mistakes. Practice these questions on our free practice test and review our study guide for a complete breakdown of all food safety topics.