Scientists have discovered toxic ‘Forever Chemicals’ present in samples of drinking water from around the world, a new study reveals.
Researchers found 10 ‘target’ PFAS (perfluoroalkyl substances) – chemicals which do not break down in nature – in tap and bottled water available for consumption in major cities in the UK and China. Perfluorooctanoic acid (PFOA) and perfluorooctane sulfonate (PFOS) were detected in over 99% of samples of bottled water sourced from 15 countries around the world.
They observed significant differences in PFAS concentrations between tap water samples from Birmingham, UK, and Shenzhen, China, with Chinese tap water found to have higher concentrations of PFAS compared to UK tap water.
However, the study demonstrates that measures such as boiling and/or activated carbon filtration – typically using a ‘jug’ water filter – can substantially reduce PFAS concentrations in drinking water, with removal rates ranging from 50% to 90% depending on the PFAS and treatment type.
Publishing their findings today (17 October) in ACS ES&T Water, researchers from the University of Birmingham, Southern University of Science and Technology, Shenzhen, and Hainan University, Haikou, reveal a wide range of PFAS contamination for target PFAS, starting at 63% of bottled waters tested.
Bottled water from various countries showed varying levels of PFAS, with natural mineral water containing higher concentrations than purified water, but the concentrations were generally below health advisory levels set by regulatory agencies.
Except for comparisons between natural mineral and purified water, the researchers observed no significant difference in target PFAS concentrations between glass and plastic or still and sparkling bottled water.
While concentrations of most individual PFAS were well below corresponding health-based reference values, average PFOS concentrations in tap water samples from Shenzhen, China exceeded the maximum contaminant level (MCL) of 4 ng/L newly promulgated by the US Environmental Protection Agency (USEPA) in 2024.
Researchers purchased 112 bottled water samples from local shops and online supermarkets in the UK and China including 89 still and 23 sparkling waters in either plastic or glass bottles. The samples covered 87 brands with water sources originating from 15 countries in Asia, Europe, North America, and Oceania
They collected 41 tap water samples from homes in Birmingham and the nearby cities of Worcester, Coventry, and Derby – provided by two suppliers: South Staffordshire Water and Seven Trent Water, with a further 14 tap water samples collected from homes in Shenzhen, China.
PFAS are used widely in industry, in fire-fighting foams, and consumer products from waterproof clothing and school uniforms to personal care products because of their water and stain repellent properties. While some have been banned by government regulation, others are still widely used and their toxic effects not yet fully investigated.
