The presence of Per- and Polyfluoroalkyl Substances (PFAS) in tap water has become a significant environmental and health concern in recent years. Among these, Trifluoroacetic Acid (TFA) is particularly noteworthy due to its persistence and potential health implications and continous growth.
What is TFA (Trifluoroacetic Acid)?
TFA is a type of PFAS, a group of human-made chemicals characterized by their resistance to heat, water, and oil. TFA, specifically, is an ultra-short-chain PFAS with a chemical structure that makes it highly stable and mobile in the environment¹.
Where Does TFA Come From?
TFA can originate from various sources, including industrial processes, the degradation of longer-chain PFAS, and as a byproduct of refrigerants and other fluorinated gases². It's also a known degradation product of PFAS-containing pesticides¹.
Where Has TFA Been Found?
TFA has been found in water sources worldwide, including the US, where a sixfold increase in TFA levels over 23 years has been reported. In Germany, TFA concentrations in rainwater have surged fivefold in two decades. The UK has yet to set limits for TFA in drinking water, despite being identified as a substance of concern. Across Europe, TFA has been detected in alarming concentrations, with 79% of samples exceeding the EU Drinking Water Directive limit for total PFAS.
Health Risks of Consuming TFA in Tap Water
The health risks associated with TFA consumption are under scrutiny. TFA has been linked to potential reproductive toxicity and developmental issues. Some studies suggest that TFA exposure may damage fertility and child development². However, assessments by health authorities of human health risks due to environmental exposures to TFA have indicated that the current levels do not pose significant health risks³.
Filtering TFA at the Water Treatment Plant
TFA is one of the most expensive PFAS substances to remove. Water treatment plants can employ several methods to reduce TFA levels, such as:
- Ion Exchange
- Reverse Osmosis
- Modified activated carbon and electro-assisted desorption
Removing TFA from Tap Water at Home
For home filtration, there are specific filters designed to reduce PFAS levels:
- Activated Carbon / Charcoal Filters (GAC or Carbon Block): These use activated carbon to trap chemicals as water passes through.
- Reverse Osmosis (RO) Systems: RO forces water through a barrier that separates chemicals from the water.
- Ion Exchange Resins: These act like magnets, attracting and holding contaminants.
It's essential to choose filters independently tested to remove or reduce PFAS to ensure effectiveness. Note that Activated Carbon is less efficient than the other two methods in reducing TFA.
Conclusion about TFA in tap water
TFA in tap water poses a complex challenge due to its persistence and potential health effects. While water treatment plants and home filtration systems offer solutions to reduce TFA levels, ongoing research and regulation are crucial to address this environmental concern comprehensively.
