Is it safe to drink herbal tea daily in an office if mugs aren’t cleaned regularly?

Short answer

Context

Employees working long shifts in an open-plan office often make herbal tea with single-serve pods, leaving brewed tea and mugs at room temperature for hours. Many wonder if reusing mugs that aren't washed regularly can be harmful, especially with the potential for cross-contamination or bacteria growth.

When it might be safe

• Using a clean mug each time or bringing your own washed mug from home
• Drinking the tea soon after brewing rather than leaving it out for hours
• Storing mugs in a designated, clean area away from shared office surfaces

When it is not safe

• Using mugs that are visibly dirty or have leftover residue from previous drinks
• Sharing mugs with coworkers or grabbing communal mugs that aren’t cleaned between uses
• Leaving herbal tea at room temperature in the mug for hours before drinking
• Drinking from mugs with an off odor or signs of mold
• Continuing to use mugs without washing, even if nobody is currently ill around you

Possible risks

• Bacterial growth in mugs or leftover tea left at room temperature (e.g., from milk, sugar, or tea residue)
• Increased risk of stomach upset or mild illness from cross-contaminated office mugs
• Potential spread of germs or viruses if mugs are shared or improperly sanitized
• Development of unpleasant taste or odors in tea from unclean mugs

Safer alternatives

• Bring a personal, regularly washed mug or travel tumbler from home
• Wash office mugs thoroughly with soap and hot water after each use
• Use disposable (preferably eco-friendly) cups if cleaning isn’t possible
• Drink freshly brewed tea shortly after preparation rather than letting it sit out

Bottom line

If you drink herbal tea daily in the office, use a clean mug and avoid letting your tea sit out for hours. Regularly washing your mug helps reduce health risks.

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