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PFAS in Drinking Water – Risks, Impacts, and Protection Options

05 Feb 2026

In Germany, Switzerland, and many other countries, drinking water is considered one of the most strictly controlled foodstuffs. Nevertheless, a substance is coming into focus for environmental physicians and consumer advocates: PFAS, also known as "forever chemicals." These industrial chemicals are increasingly contaminating our drinking water – with consequences for health that are not yet fully assessable.

In this article, you will learn what PFAS are, how they get into drinking water, what dangers they pose, and how you can effectively protect yourself.

Table of Contents

What are PFAS?

PFAS stands for "per- and polyfluoroalkyl substances." This refers to a group of several thousand synthetic chemicals that have been used in industry since the 1950s. PFAS make materials fat-, dirt-, and water-repellent and are found in many everyday products – for example, in outdoor clothing, pans (Teflon), fire extinguishing foam, packaging, or cosmetics.

Their chemical structure is problematic: PFAS are extremely stable and hardly degrade in the environment. This means they can accumulate in water, soil, animals – and ultimately in the human body – over long periods.

How do PFAS get into drinking water?

PFAS enter the environment mainly through industrial processes, wastewater treatment plants, landfills, and contaminated soil. Regions with chemical plants or former military sites where PFAS-containing extinguishing foam was used are particularly affected.

The substances can seep into the soil and thus enter groundwater. Surface waters can also be contaminated by wastewater. Since many waterworks draw their water from groundwater or rivers, PFAS can enter tap water this way.

Why are PFAS harmful to health?

PFAS are suspected of contributing to various health problems. Studies suggest links to liver dysfunction, elevated cholesterol levels, immune system disorders, and certain types of cancer. An influence on hormone balance and effects on fertility are also discussed.

Children, pregnant women, and people with weakened immune systems are particularly at risk. Since PFAS accumulate in the body and are excreted very slowly, even small amounts can pose potential risks with long-term exposure.

Health Risks of PFAS in Detail

The same chemical stability that makes PFAS so useful in industry and consumer goods can be problematic for the body: PFAS are hardly biodegradable and accumulate in tissues – sometimes over decades. Numerous studies show that even low concentrations in the blood can have long-term negative effects.

The following areas, among others, are discussed:

  • Reproductive health: possible hormone balance disorders and negative effects on fertility.
  • Hormonal balance: PFAS are considered possible endocrine disruptors and can influence messenger substances.
  • Immune system: correlations with reduced vaccine response and weakened defenses are described.
  • Cancer risk: PFOA, in particular, is linked to increased risks (e.g., kidney and testicular cancer).
  • Liver: PFAS can influence liver enzymes and be associated with metabolic problems.
  • Metabolism: correlations with obesity, type 2 diabetes, and insulin regulation are discussed.
  • Nervous system: in children, possible links to developmental and cognitive effects are being investigated.

Important: Research continues to evolve. How strongly individual PFAS act depends, among other things, on the dose, duration of intake, and the specific substance.

How do I find out if my water is contaminated?

You can find out if PFAS are present in your drinking water by contacting your water supplier or relevant environmental authorities. In Germany, waterworks provide analysis data on drinking water quality upon request. In Switzerland, monitoring is decentralized through cantons and municipalities.

Additionally, you can have your water tested by specialized laboratories. Make sure that PFAS are explicitly examined – as PFAS are not included in every standard test.

What are the limit values for PFAS?

Germany and EU: With the EU Drinking Water Directive, limit values for PFAS apply, including a sum limit value of 0.1 micrograms per liter for four particularly problematic PFAS (PFOA, PFOS, PFNA, and PFHxS) and 0.5 micrograms per liter for the group of relevant PFAS.

Switzerland: In Switzerland, there are recommendations for maximum concentrations of PFAS in drinking water; often the value for individual PFAS is around 0.1 micrograms per liter. In practice, there is an increasing orientation towards European guidelines.

Note: Limit values and assessments can change as research continuously provides new insights.

How can I filter PFAS from drinking water?

Simple household filters (e.g., pure activated carbon pitcher filters) often remove PFAS only to a limited extent or not at all. More powerful methods are needed for effective reduction.

Reverse osmosis systems are considered particularly effective: Water is forced through a semi-permeable membrane that can retain many dissolved pollutants – including PFAS. Ion exchange and combined filter systems can also achieve high retention rates if properly designed.

Find out more here: View reverse osmosis systems.

What can I do to protect myself from PFAS?

Even if regulation and remediation take time, you can already reduce your personal PFAS exposure today:

  • Shop informed: Look for labels like "PFAS-free" on clothing, cosmetics, cookware, or outdoor products. Avoid fluorinated coatings and opt for alternatives like glass, stainless steel, or natural fibers.
  • Filter drinking water: A reverse osmosis system is one of the most effective methods for PFAS reduction. Cheaper filters may perform less effectively depending on the system.
  • Consciously shape your diet: Reduce highly processed foods and unnecessary plastic packaging, if possible.
  • Share knowledge: Inform yourself about studies, discuss them with others, and support local initiatives.
  • Support political change: Advocate for stricter rules and consistent implementation – e.g., through petitions or local involvement.

Conclusion: Act instead of hoping

PFAS in drinking water are a real and growing problem. Even if limit values and monitoring are expanded, there often remains a gap between scientific findings and practical implementation. If you don't want to wait, you can become active yourself: Inform yourself, check your supplier's data or use laboratory tests – and, if necessary, rely on effective filter technology. Clean water is not a luxury, but a basic need.

Frequently Asked Questions (FAQ)

What exactly are PFAS and why are they in water?

PFAS are long-lasting industrial chemicals that can enter the environment and thus also drinking water via wastewater, sewage treatment plants, landfills, and contaminated soil.

How dangerous are PFAS for health?

Long-term exposure is associated with potential risks such as hormone disruption, effects on the immune system, and certain types of cancer. It is particularly relevant that PFAS can accumulate in the body.

Is my tap water regularly tested for PFAS?

This depends on the region and supplier. Comprehensive testing for all PFAS does not take place everywhere to the same extent. It is best to ask your water supplier for current analysis values.

Which filters really help against PFAS?

Reverse osmosis systems are considered very effective. Depending on the design, ion exchangers or combination systems can also achieve good results. Simple pitcher filters are often not sufficient.

Can I detect PFAS in water myself?

No. PFAS are odorless and tasteless. Only measurement data from the supplier or targeted laboratory tests provide clarity.

How useful is an osmosis system against PFAS?

Very useful if you want to effectively reduce PFAS contamination in drinking water: reverse osmosis can significantly reduce many PFAS compounds, provided the system is operated and maintained correctly.

 

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