Ordering a glass of water with a slice of lemon feels like a healthy choice. It adds a fresh citrus flavor, contains no added sugar, and can make plain water a little more enjoyable. Many people order it without giving it a second thought.

However, food safety experts have pointed out that lemon wedges served in restaurants can sometimes carry unwanted bacteria if they aren’t handled properly. While this doesn’t mean every restaurant’s lemon slices are unsafe, it’s worth understanding how contamination can happen and what you can do to reduce your risk.

Why Lemon Wedges Can Be a Food Safety Concern

Lemons naturally have acidic juice, which can slow the growth of some bacteria. However, the outside of the fruit isn’t sterile, and once it’s sliced, the exposed flesh can pick up germs from hands, cutting boards, knives, or food preparation surfaces.

Unlike foods that are cooked before serving, lemon wedges are typically added directly to drinks without any additional treatment to remove contaminants.

If proper food-handling procedures aren’t followed, bacteria can be transferred to the fruit before it ever reaches your glass.

What Research Has Found

Several food safety studies have examined lemon slices served in restaurants.

One widely discussed investigation found that many lemon wedges sampled from restaurants contained various types of bacteria. Another study published in the Journal of Environmental Health detected microbial contamination on a significant number of restaurant lemon samples.

It’s important to keep these findings in context. Detecting bacteria doesn’t automatically mean the fruit will make someone sick. Many microbes are harmless, and the amount of bacteria present can vary greatly. Still, the studies highlight why proper food handling is essential.

How Does Contamination Happen?

There are several ways bacteria can end up on lemon slices.

Bare-Hand Contact

If employees handle lemon wedges with unwashed hands, bacteria can easily transfer to the fruit. This is why food safety guidelines recommend using clean utensils, gloves when appropriate, or freshly washed hands when preparing ready-to-eat foods.

Cross-Contamination

Lemons may also become contaminated if they’re prepared on cutting boards or with knives that were previously used for raw meat, poultry, seafood, or unwashed produce without being properly cleaned and sanitized.

Even a clean-looking surface can transfer bacteria if it hasn’t been washed correctly.

Improper Storage

Once lemons are sliced, they should be refrigerated and stored in clean, covered containers. Leaving cut fruit at room temperature for long periods increases the opportunity for bacteria to multiply.

Does the Lemon’s Acidity Kill Germs?

Many people assume that lemon juice kills all bacteria because it’s acidic.

While acidity can reduce the survival of certain microorganisms, it doesn’t instantly sterilize the fruit. Some bacteria can survive long enough to be transferred into your drink, especially if contamination occurred shortly before serving.

In other words, acidity helps, but it shouldn’t be relied upon as a substitute for proper food safety practices.

Should You Stop Ordering Lemon Water?

Not necessarily.

Many restaurants follow excellent sanitation procedures, properly wash produce, refrigerate cut fruit, and train employees in safe food handling. In those establishments, the risk is likely very low.

However, if you’re concerned about food safety—or if you have a weakened immune system—it may be reasonable to skip the lemon garnish when dining out.

Drinking plain water is a perfectly safe and refreshing alternative.

Signs of Good Food Safety Practices

Although customers can’t see everything happening in the kitchen, there are a few indicators that suggest a restaurant takes hygiene seriously:

• Employees wash their hands frequently.
• Staff use clean utensils to handle garnishes.
• Food preparation areas appear clean and organized.
• Fresh produce is stored under refrigeration.
• Servers avoid touching the part of the lemon that will contact your drink.

While these observations don’t guarantee perfect food safety, they can provide some reassurance.

Tips for Safer Dining

If you enjoy citrus in your water but want to reduce potential risks, consider these simple habits:

• Ask for water without a lemon wedge.
• Add fresh lemon after you get home if you’re eating takeout.
• Wash your hands before eating.
• Choose restaurants with good sanitation practices and health inspection records.
• If the lemon slice looks dried out or has obviously been sitting for a long time, simply leave it out of your drink.

Enjoy Lemon Water at Home

Making lemon water at home gives you complete control over how it’s prepared.

Wash the lemon thoroughly under running water before cutting it, use a clean knife and cutting board, and refrigerate any unused slices promptly. Freshly prepared lemon water provides the same bright flavor without relying on restaurant handling practices.

The Bottom Line

Lemon water itself isn’t the problem—improper food handling is.

Research has shown that restaurant lemon wedges can sometimes carry bacteria when hygiene standards aren’t followed, but that doesn’t mean every slice of lemon is unsafe. Restaurants that practice proper sanitation greatly reduce the risk of contamination.

If you’d rather play it safe, simply request your water without a lemon. It’s an easy choice that may offer a little extra peace of mind while dining out, and you can always enjoy freshly prepared lemon water at home whenever you like.