High Levels of Toxic PFAS Detected in Solent Waters
Scientists have identified elevated concentrations of toxic per- and polyfluoroalkyl substances (PFAS) in soil, water, and throughout the marine food chain in the Solent strait, located off southern England. This includes areas designated as protected environmental sites, according to a recent study.
In certain samples, PFAS pollution was measured at 13 times the safe threshold established for coastal waters. Other samples, although below legal limits for individual chemicals, failed assessments for combined toxicity, indicating potential risks from chemical mixtures.
The Solent strait, which separates the Isle of Wight from the mainland and forms part of the English Channel, was the focus of the sampling. Researchers believe the PFAS contamination originates from multiple sources, including wastewater treatment plants, sewage outflows, historic landfills, and nearby military installations.
Sources and Regulatory Implications
The findings underscore the necessity to monitor chemical pollutants in combination rather than individually. The study advocates for a comprehensive ban on PFAS as part of the UK government’s water reform agenda.
“If there was an oil spill in the Solent that industry would have to pay for the restoration of those habitats, but that doesn’t happen with sewage.”
These remarks were made by Professor Alex Ford, a biologist at the University of Portsmouth and co-author of the study. He further noted,
“This is one thing I don’t necessarily pin on the water companies because they don’t have the capacity to treat these compounds. That’s why they should be banned at source.”
Understanding PFAS and Their Impact
PFAS are a group of chemicals valued for their durability and resistance to degradation. They are widely used in various industries and consumer products such as non-stick cookware, food packaging, and waterproof clothing. Due to their persistence in the environment and resistance to natural breakdown, PFAS are often referred to as “forever chemicals.” Scientific studies have documented their accumulation in both humans and wildlife.
Study Methodology and Findings
The research team analyzed government data, conducted tests at water utilities, and collected their own samples from a variety of marine species, including a dozen types of fish, seaweed, and invertebrates. Their analysis revealed that PFAS are entering the Solent through treated effluent discharged from wastewater treatment plants in Portsmouth and Fareham. These facilities are operated by Southern Water, which provides drinking water and sewerage services for Kent, Sussex, Hampshire, and the Isle of Wight.
The study also mapped 194 combined sewer overflow outfalls and identified more than 500 historic landfill sites in proximity, which are believed to contribute to the PFAS pollution.
Some marine wildlife samples contained individual PFAS chemicals exceeding existing legal safety limits, including elevated levels found in the livers of harbour porpoises. A significantly larger number of samples failed a newer European Union test designed to assess combined toxicity by evaluating the relative potency of PFAS mixtures.
Almost all English surface waters tested positive for PFAS contamination, as did a number of groundwater sources.
“I don’t think our story is specific to the Solent,”said Professor Ford.
“I think we would see a pattern all around the UK.”
Industry and Regulatory Responses
A spokesperson for Southern Water acknowledged the need for updated legislation to restrict or ban certain chemicals.
“Tackling the presence of these chemicals is a challenge for society as a whole,”they stated.
“The most sustainable solution is to meet the problem at source … and keep [the chemicals] out of pipes and the environment in the first place.”
Despite the persistence of PFAS in the environment, evidence indicates that these substances can be effectively managed through regulatory action.
The European Union is progressing towards implementing a blanket ban on PFAS, with probable exemptions for critical uses such as medicine. The UK government announced plans to consult on setting limits for PFAS and to conduct further testing following the publication of its own environmental strategy in February. This strategy promises a framework to identify sources, track the spread, and reduce public and environmental exposure to these chemicals.
However, the environmental charity that funded the Solent study emphasized the urgency of accelerated action.
“We need to go further and faster.”
“It’s not good enough to plan to have a plan,”said Calum Duncan, head of policy at the charity.
“We urgently need action and we have this once-in-a-generation opportunity with the water reform process to get on and do that.”
