I ordered lemon water at a restaurant for me and my kid, and a server secretly told me that she wouldn’t bring it to us and that I should never order it again. I didn’t ask her why because I didn’t want to get her in trouble. She seemed serious about it. That quiet warning has stuck with me ever since, and it turns out there are several unsettling reasons why restaurant staff sometimes refuse to serve lemon water or urge customers to avoid it.

One of the most common explanations involves hygiene. Lemons in many restaurants are handled repeatedly by multiple people throughout the day. Servers often cut and place lemon wedges with bare hands after handling cash, dirty plates, or other contaminated surfaces. Studies and health inspections have repeatedly shown that the outer rind of restaurant lemons can carry bacteria such as E. coli, fecal coliforms, and other pathogens. When the lemon is squeezed into the water, those contaminants can easily transfer into the drink, especially if the fruit is not properly washed beforehand.

Another reason centers on cost and kitchen practices. Fresh lemons are relatively expensive for high-volume restaurants, so some establishments cut corners. Lemons may sit out for hours or even days, becoming warm, soft, and more prone to bacterial growth. In busy kitchens, the same cutting board and knife used for raw meat or other foods may also be used for lemons without thorough cleaning. A well-meaning server who notices these shortcuts may feel compelled to protect customers, particularly when children are involved, by quietly steering them away from the item.

There is also the issue of how lemon water is sometimes prepared. In certain restaurants the “lemon water” is not simply water with a fresh lemon wedge. It can be pre-mixed in large batches, stored in pitchers that are rarely cleaned, or mixed with leftover ice that has been sitting in a dirty bin. Some places even reuse lemon wedges from previous customers’ glasses. A server who has seen these practices firsthand may decide the risk is not worth it and choose to warn a polite customer instead of serving something she believes is unsafe.

Finally, the warning could stem from a specific incident the server witnessed. Perhaps a recent health inspection flagged the lemon station, or a coworker got sick after consuming the same drink. Servers work long shifts and notice patterns that managers might overlook. When one of them takes the personal risk of speaking up, it usually means they have seen enough to feel genuinely concerned. While not every restaurant has these problems, the fact that a staff member felt the need to issue a quiet warning is reason enough to think twice before ordering lemon water the next time you dine out.