PFAS found in the Solent
High PFAS contamination found in the Solent
The Guardian
5/19/20263 min read
“High Levels of Toxic ‘Forever Chemicals’ Found off Coast of Southern England” (The Guardian, 19 May 2026)
This article reports on a major scientific study that found widespread PFAS contamination throughout the Solent, the stretch of water separating the south coast of England from the Isle of Wight. Researchers discovered PFAS not only in seawater, but throughout the marine ecosystem, including sediments, seaweed, fish, shellfish and marine mammals. The findings suggest that PFAS pollution is deeply embedded within one of the UK's most economically and environmentally important coastal regions.
The headline finding
The most striking result was that levels of one of the best-known PFAS compounds, PFOS, exceeded UK and EU coastal safety thresholds by more than 13 times at some sampling locations. Researchers also found situations where individual chemicals appeared to meet legal standards, but the combined mixture of PFAS compounds exceeded toxicity thresholds when assessed together.
The study therefore argues that current regulatory approaches may underestimate real-world risks because they often assess chemicals individually rather than as mixtures.
What researchers tested
Scientists from the University of Portsmouth and the Marine Conservation Society carried out one of the most comprehensive PFAS investigations conducted in UK coastal waters.
They examined:
Seawater
Marine sediments
Wastewater discharges
Seaweed
Fish
Crustaceans
Marine mammals
Historic monitoring data
The goal was to understand how PFAS move through the entire marine food web rather than focusing on isolated samples.
PFAS found throughout the food chain
One of the most concerning conclusions was that PFAS were detected at multiple levels of the marine ecosystem.
Researchers reported evidence of contamination:
At the bottom of the food chain
In commercially and recreationally important marine species
In top predators such as marine mammals
Scientists described this as evidence that PFAS are circulating throughout the Solent food web rather than remaining confined to isolated pollution hotspots.
The article emphasizes that persistent chemicals like PFAS tend to accumulate over time and may become more concentrated higher up the food chain, raising concerns about long-term ecological impacts.
Where is the pollution coming from?
The study did not identify a single source. Instead, researchers found evidence of multiple contributing pathways.
Potential sources include:
Treated wastewater discharges
Sewage outfalls
Historic landfill sites
Industrial activity
Military facilities
Urban runoff
Researchers mapped hundreds of combined sewer overflow points and more than 500 historic landfill sites around the Solent, many of which could contribute PFAS to the marine environment.
Importantly, scientists stressed that wastewater treatment plants are not currently designed to remove PFAS effectively. As a result, treated wastewater can still contain significant concentrations of these chemicals.
The role of wastewater treatment works
A major focus of the study was wastewater infrastructure.
Researchers identified two large treatment works serving hundreds of thousands of residents as important pathways through which PFAS enter the marine environment.
However, the article notes that scientists did not place sole responsibility on water companies. Instead, they argued that wastewater plants are largely receiving PFAS that originate from consumer products, industrial processes and other upstream uses. Because treatment systems were never designed to remove these highly persistent chemicals, they effectively become transfer points rather than sources.
This led researchers to argue that the most effective solution is reducing PFAS use at source rather than relying entirely on end-of-pipe treatment technologies.
Protected environmental sites affected
The article highlights that contamination was detected even in environmentally protected areas.
This is significant because the Solent contains:
Protected habitats
Internationally important bird populations
Commercial fisheries
Sensitive marine ecosystems
The findings therefore raise concerns not only about pollution levels but also about the ability of existing environmental protections to prevent contamination by highly persistent chemicals.
Implications for regulation
Researchers used the findings to argue that UK PFAS regulation is failing to keep pace with scientific understanding.
Several concerns were raised:
Thousands of PFAS substances remain in use.
Regulation often targets individual compounds.
Chemical mixtures may pose risks not captured by current standards.
Environmental monitoring remains inconsistent.
Scientists called for stronger restrictions on PFAS production and use, as well as more comprehensive environmental monitoring programmes.
Responses from stakeholders
The article notes that Southern Water expressed support for stronger legislation restricting PFAS at source, recognizing that water treatment alone cannot fully solve the problem. Environmental organisations, including the Marine Conservation Society, also called for more ambitious national action to prevent further contamination.
The findings emerged during growing political scrutiny of PFAS in the UK, including parliamentary calls for restrictions on non-essential uses of these chemicals.
Why the Solent matters
The Solent is one of the busiest and most strategically important coastal regions in Britain.
It supports:
Major shipping activity
Tourism
Commercial fishing
Recreation
Protected wildlife habitats
Researchers argue that if contamination at this scale exists in a heavily studied region like the Solent, similar problems may be present in other UK coastal waters that have received less attention.
Key takeaway
The central message of the article is that PFAS contamination in the Solent is not confined to isolated hotspots but appears to be distributed across the entire marine ecosystem. Researchers found contamination in water, sediments, wildlife and wastewater pathways, with some concentrations exceeding safety thresholds by more than thirteenfold. The study concludes that current regulations, which focus largely on individual chemicals, may underestimate the true scale of PFAS risks and that stronger controls on PFAS use are needed to prevent further accumulation in UK coastal environments.
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