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Medical experts warn reusable water bottles can harbor harmful bacteria like E. coli and Streptococcus without daily washing, reducing microbes by about 90%, they say.

  • GPs and health experts have urged people to stop a common reusable water-bottle habit that could make them ill, with Dr Rupa Parmar and Dr Asimah Hanif among clinicians issuing the appeal.
  • Experts say moisture and warmth inside bottles create ideal breeding conditions as bacteria like E. coli, Streptococcus, and Staphylococcus enter from hands and mouths and thrive in crevices.
  • Practical cleaning methods include hand scrubbing and dishwasher cycles, with handwashing or dishwashing reducing microbe contamination by approximately 90%.
  • While reusable bottles cut plastic waste, experts warn of hygiene downsides as unclean bottles can cause stomach aches, itchy throats, and worsen allergies, with plastic bottles harbouring microbes in scratches.
  • Many experts recommend a simple daily wash and periodic deeper cleaning, advising to empty old water every few days and discard bottles with visible mould or a weird smell.
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66 Articles

Lean Left

Daily cleaning with soap and water is ideal, but a deeper cleaning can be done weekly

Associated Press NewsAssociated Press News
+20 Reposted by 20 other sources
Lean Left

Yes, you do need to clean your water bottle. Here's why and how

Reusable bottles get grubby no matter what liquid they’re filled with, so it’s important to clean them regularly.

·United States
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Wiltshire TimesWiltshire Times
+2 Reposted by 2 other sources
Center

Wiltshire residents warned to stop one water bottle habit before it makes them ill

A number of GPs and health experts have urged people to avoid one habit with their water bottles to avoid becoming ill

·Trowbridge, United Kingdom
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Glasgow Times broke the news in Glasgow, United Kingdom on Friday, November 7, 2025.
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