When you think of the safety of commercial airplanes, you may think of the safety demonstration or video they show prior to take-off. Or technology that detects faulty wiring (such as the electrical circuit test developed by live wire) or maybe even smoke sensors. Chances are you probably don’t think about the water onboard.
Over the past five years, the Environmental Protection Agency (EPA) tested the water (used both for drinking and in the lavatories) on more than 300 planes from various airlines and found the bacteria coliform (a commonly used bacterial indicator of the sanitary quality of foods and water) in 15 percent of them. While coliform itself is not usually harmful it does indicate the presence of other germs and bacteria that can cause disease.
Subsequently, the EPA ruled that airlines must take steps in order to rid tap water used on board of such bacteria. The rules essentially mandate that airlines that test their water often do not have to disinfect and flush as often while airlines that test the water less frequently are required to flush and disinfect more often. The new rules apply only to tap water used onboard, not bottled water.
Under a settlement with the EPA, forty-five domestic carriers have already agreed to the rules and will test their water frequently and report the results (which will be made public). While the carriers have up to two years to enact the new rules, the EPA estimates complying with them will cost approximately $7 million annually. Learn more about the issue on the official EPA website.





