The Disturbing Reason You May Want To Avoid Drinking Coffee And Tea On Airplanes

Did you know that when you order coffee or tea on a flight, the hot water used often doesn't come from sealed bottles? Instead, it's sourced from the plane's onboard water tanks — and it may not always be safe for consumption. According to a 2026 airline water study conducted by the Center for Food as Medicine and Longevity — which analyzed more than 35,000 water sample locations from 10 major and 11 regional U.S. airlines — a whopping 949 samples (2.7% of the total) tested positive for coliform bacteria. In addition, 32 samples also showed E. coli contamination, which is an indicator of possible fecal pollution.

The airlines were scored from 0.00 to 5.00 using a Water Safety Score, considering factors such as compliance with the Aircraft Drinking Water Rule (ADWR), E. coli and total coliform test results, public notices, and maintenance practices. Among the major airlines tested, JetBlue Airways, American Airlines, and Spirit Airlines scored the lowest — each receiving a "D" grade, with ratings of 1.75, 1.80, and 2.05, respectively.

Although some major airlines — including Delta Air Lines and Frontier Airlines — performed better, the study showed that onboard water quality largely depends on the original water source, the mode of transfer, and how long the water sits unused. This means that the risk is not entirely eliminated, no matter which airline you choose to fly. And even though coliform bacteria alone do not always lead to illness, their presence suggests that disease-causing organisms could also be present. As such, to be on the safe side, it's advisable you avoid drinking onboard coffee or tea, as well as any other drink that doesn't come from a sealed container.

Regardless of the airline, one of the best ways to keep yourself safe is to opt for beverages served from sealed bottles or cans during your flight. Alternatively, you can also bring your own water onboard by carrying a reusable bottle and filling it up at a refill station, which you'll find once you've passed through security, to keep yourself hydrated. Plus, bringing a reusable bottle will also help you reduce one of the negative effects of over-tourism.

If you're hoping to enjoy hot water or another beverage, it's also possible to purchase one from a coffee stand inside the airport before you hop on the plane — or you can even get one for "free" if you're willing to splurge to get into one of the most high-end airport lounges in the U.S. Alternatively, you can bring an insulated bottle and fill it with hot water after passing through security, which can keep your homemade drink warm for several hours.

Hot drinks aside, any other onboard items that may use tap water from the aircraft are also best avoided. Ice is a prime example. In fact, some experts even advise against washing your hands with the water onboard — even after using the lavatory. Instead, they suggest you use a hand sanitizer with a minimum of 60% alcohol to clean your hands. And, of course, brushing your teeth with this water should also be avoided. Ultimately, with these little adjustments and some pre-trip planning, you can reduce unnecessary risk and enjoy a truly hassle-free getaway.