Tap water in the Czech Republic meets strict standards and is considered safe.

At the same time, it is not "pure" in the sense that it would only contain H₂O.
It contains a number of substances that get into it during treatment and through the pipelines.

Most of them are present in small amounts.
But the question is not just "is it safe?", but also:

"what is the long-term impact of what I consume every day?"

Disinfectants: Chlorine and chloramines

They are used for water disinfection.


Long-term effects:

  • they can affect the taste and smell of water → lower fluid intake
  • in more sensitive people, they can irritate the digestive tract or skin

  • when reacting with organic substances, by-products can form (e.g., trihalomethanes)

This is not an acute problem, but rather long-term exposure to low doses.

  • Microorganisms and biofilm

    • bacteria
    • microorganisms in pipes

    Long-term effects:

    • mostly harmless
    • but can affect digestion in more sensitive individuals

    Therefore, water is disinfected – which, however, introduces additional substances

  • Microplastics and PFAS

    • microplastics
    • PFAS ("forever chemicals")

    Long-term impact:

    • PFAS can accumulate in the body
    • linked to effects on the immune system and metabolism
    • microplastics are still under research

    This is a relatively new topic that is only now being studied in detail

Why start dealing with it

Not out of fear.
But out of simple logic:

  • you drink water every day
  • it affects your body long-term
  • you can relatively easily influence its quality

It's one of the few things you have full control over.

  • Realistic outlook

    • It is not that the water is "harmful."

    It's about the difference between:

    "good enough"

    &

    "the best for everyday use"

  • Summary

    Tap water can contain:

    • chlorine and disinfectants
    • heavy metals
    • pesticides
    • pharmaceutical residues
    • modern chemicals (PFAS, microplastics)

    All in small quantities, but with potential long-term effects with daily consumption

Conclusion

Everyone can choose according to their preferences.

But if you're thinking about what you do for your body long-term,
it makes sense to also focus on the water you drink every day.

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