Europe’s Hidden Time Bomb: Thousands of Landfills Threaten Water and Ecosystems
A continent-wide investigation reveals that thousands of landfills across the UK and Europe are situated in floodplains, posing a significant and growing threat to drinking water sources, conservation areas, and overall environmental health as toxic waste leaches into rivers, soils, and ecosystems. The groundbreaking mapping effort, conducted by the Guardian, Watershed Investigations, and Investigate Europe, exposes a systemic vulnerability exacerbated by climate change and inadequate waste management practices.
The findings highlight a critical issue: a lack of comprehensive data and centralized records regarding landfill locations and contents across the European Union. This deficiency hinders effective risk assessment and remediation efforts, leaving communities potentially exposed to hazardous materials.
Rising Flood Risks and Toxic Leaching
With the increasing frequency and intensity of floods and erosion driven by climate change, the risk of waste escaping from these sites is escalating. “There’s a greater risk of these wastes washing into our environment,” explained Patrick Byrne, of Liverpool John Moores University. This includes not only physical waste like plastics and construction debris, but also dangerous toxic metals and chemicals such as PFAS – often called “forever chemicals” – and polychlorinated biphenyls (PCBs).
Kate Spencer, professor of environmental geochemistry at Queen Mary University, underscored the severity of the situation. “We’ve identified wide-ranging wastes at an eroding coastal landfill [in Tilbury] including what looked like hospital blood bags,” she said, adding that the potential for contamination is immense. “We are talking about tens of thousands of sites that, if they aren’t lined and are at flood risk, then there’s multiple ways for it to get into groundwater, surface water and the food chain.”
Across the EU, an estimated 500,000 landfills exist, with roughly 90% – including 22,000 sites in the UK – predating modern pollution control regulations like landfill linings designed to prevent leaching. While well-managed, modern landfills present a lower risk, the sheer number of older, unlined sites represents a substantial and largely unquantified threat.
Mapping the Vulnerability
The investigation identified over 61,000 landfills across Europe, with 28% located in areas susceptible to flooding. Modeling suggests the actual number of at-risk sites could be as high as 140,000. The research team emphasized the challenges in obtaining accurate data, noting that EU institutions lack a centralized landfill registry and that information from individual member states is often fragmented, inconsistent, and inaccessible.
“We have inadequate records, differences in ways of categorising these sites and that makes it really difficult to deal with,” Spencer stated. “It’s the worst possible scenario. Most landfills will be fine, but you only need a small number of sites which contain very toxic chemicals to be a problem. We just don’t know which ones.”
Compounding the issue, over half of the mapped landfills are in areas where groundwater already fails to meet chemical quality standards, suggesting a potential link between landfill activity and existing contamination.
“Forever Chemicals” and Real-World Impacts
The dangers are not theoretical. Byrne’s research revealed leachate – liquid that has percolated through a landfill – leaking from a historic landfill at Newgate nature reserve in Wilmslow, Cheshire, into a nearby stream. Tests showed levels of PFAS at 20 times the acceptable limit for drinking water.
Similar contamination was found in Greece, where tests detected PFAS levels many times above drinking water standards, along with mercury and cadmium leaching into the Nedontas river from the former Maratholaka landfill site in the Taygetos mountains. This site is frequented by thousands of hikers annually. While the local mayor of Kalamata stated that the site ceased operations in June 2023 and currently shows “no evidence or data to substantiate any environmental impact,” the potential for long-term consequences remains.
The investigation also revealed that nearly 10,000 landfills are located in designated drinking water protection zones across France, the UK, Spain, Germany, the Netherlands, and Italy. Over 4,000 of these are historic landfills in England and Wales, lacking modern pollution controls. Determining whether European landfills predate regulations proved difficult due to data limitations.
“We don’t and won’t know how much risk to human health and our drinking water there is until you can identify where all the landfills are, what is in them, whether they’re leaching and if treatment processes are filtering them out,” Byrne warned.
Regulatory Response and Coastal Vulnerability
A spokesperson for the European Commission affirmed that the EU’s Drinking Water Directive ensures water quality “at the tap” through monitoring and compliance with established limit values, requiring remedial action when exceeded. In the UK, water companies conduct risk assessments and monitor public water abstractions under regulatory guidelines.
However, the most visibly vulnerable landfills are those situated along coastlines. The analysis identified 335 landfills in coastal erosion zones in England, Wales, and France, and 258 landfills across Europe within 200 meters of the coast, all at risk from erosion and storm surges.
“This is the tip of the iceberg,” Spencer emphasized, noting her work with the Department for Environment, Food and Rural Affairs (Defra) to prioritize 1,200 high-risk landfills in England and Wales. Testing at eroding coastal landfills revealed elevated arsenic concentrations at Lynemouth in the northeast and high levels of lead at Lyme Regis in the southwest, both posing ecological risks.
“We now need to understand the potential risks of climate change and associated pollution release at all our historic landfill sites, not just the coastal ones,” Spencer said, stressing the need for dedicated funding to address the problem.
A Nation Built on Waste
The scale of the problem is stark. “Essentially we are all living on a garbage dump,” Spencer stated, pointing out that approximately 80% of the British population lives within 2 kilometers of a known landfill site, disproportionately affecting the most deprived communities.
While a report from the UK’s Health Security Agency concluded that well-managed landfills pose a limited risk to human health, the picture remains unclear for historic sites due to data gaps. The potential impact on wildlife is also a concern, with over 2,000 European landfills located in protected conservation areas.
“We know plastics are accumulating in wildlife, humans and environments and there’s emerging evidence of negative health impacts,” Byrne said. “A key thing with chemical pollution is where the chemical leachate goes. We have important wetlands around these areas, so if the leachate goes there it could accumulate in wildlife.”
Illegal waste dumping further exacerbates the issue, identified by Europol as a rapidly growing area of organized crime. In February, Croatian authorities arrested 13 individuals suspected of illegally dumping at least 35,000 tonnes of waste from Italy, Slovenia, and Germany, generating an estimated €4 million in profits. In England, the Environment Agency is currently investigating 137 illegal dump sites containing over 1 million cubic meters of material.
The Campania region of southern Italy serves as a grim example, where illegal toxic waste dumping by the mafia has been linked to increased rates of death and disease.
With landfill capacity in England and Wales projected to be exhausted by approximately 2050 at current usage rates, finding sustainable alternatives is critical. New landfill sites often face environmental opposition and public resistance.
An Environment Agency spokesperson stated that the agency is “working closely with the landfill industry, water companies and across government to better understand the impacts from PFAS chemicals in landfills” and is undertaking a multi-year program to improve data on PFAS pollution sources.
A Defra spokesperson affirmed a commitment to reducing waste sent to landfill through collection and packaging reforms, and a forthcoming circular economy growth plan aimed at promoting reuse and recycling. However, the investigation’s findings underscore the urgent need for comprehensive data collection, proactive risk assessment, and substantial investment in remediation efforts to mitigate the looming environmental and public health crisis posed by Europe’s hidden landfills.
