Take a walk around any local park, office or city centre and there’s a good chance you’ll see a number of people drinking from reusable water bottles.
They’ve become something of a fashion accessory, as well as a means to help us meet the NHS health recommendations of drinking 6-8 glasses of water per day and reduce our environmental footprint by cutting down on the need for single-use plastic bottles.
But, while using a water bottle might be a noble, health-improving and planet-protecting act, the bottles may be carrying a hidden risk. Research carried out by US water filtration company WaterFilterGuru has shown that if you don’t regularly wash your water bottle thoroughly, bacteria and moulds can build up – both on the inside and outside – that, if swallowed, have the potential to make you very ill.
Water, even from a kitchen tap, isn’t usually sterile, and bacteria begins growing naturally in all non-carbonated waters only a few days after a bottle is filled. The longer that water is stored in a bottle at room temperature, the more bacteria will grow. (Refrigerating filled water bottles can help limit microbial numbers, however.)
Some of a water bottle’s microbes will come from the water itself, but mostly they come from the person drinking from it. Our bodies are naturally covered with millions of microbes (microflora), including the insides of our mouths.
Microbes found inside a typical water bottle unsurprisingly include skin and oral microbes, such as Staphylococcus and Streptococcus. Although these bacteria are normally part of the human microflora, they can cause skin and respiratory infections.
This story is from the February 2024 edition of BBC Science Focus.
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This story is from the February 2024 edition of BBC Science Focus.
Start your 7-day Magzter GOLD free trial to access thousands of curated premium stories, and 9,000+ magazines and newspapers.
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