A remarkably simple yet effective solution for cleaning polluted waterways has emerged from recent trials in England, where researchers successfully used turkey tail mushrooms to filter harmful bacteria and nutrients from rivers. The innovation, which requires minimal infrastructure and cost, has already attracted significant investment for broader implementation.
The method involves placing bags of woodchips impregnated with turkey tail mushroom spores at the bottom of rivers. The mycelia—the thread-like filament system of the mushroom—acts as a natural filter, removing pollutants as water flows through. In trials conducted in Devon, the mushroom filters removed 80% of E. coli bacteria from sewage-contaminated water.
The success of the Devon trial prompted water industry regulator OFWAT to award nearly $2 million to local utility Anglian Water for scaling up the project. The funding reflects confidence in the technology's potential to address widespread water quality challenges across England and potentially beyond.
A parallel trial in Lincolnshire demonstrated the mushrooms' versatility in addressing different types of pollution. In that location, the fungi targeted agricultural runoff rather than sewage, successfully filtering 83% of phosphorous and 35% of nitrogen from the water. These nutrients, when present in excess, trigger abnormal algae blooms that deplete oxygen levels and harm aquatic ecosystems.
Joshua Mercer of Anglian Water described the fungal filtration system as a "second line of defense" to complement conventional sewage treatment processes. "If [this work] can have a positive impact on water quality, then it's benefiting everyone," Mercer told the BBC. "When my daughter gets to my age, it would be great if people can just go and swim wherever they want."
The turkey tail mushroom, already valued for its culinary and medicinal properties, joins a growing list of fungi demonstrating remarkable environmental remediation capabilities. Previous research has shown that various mushroom species can absorb heavy metals and even nuclear radiation from contaminated sites.
The elegance of this approach lies in its simplicity and scalability. Unlike complex mechanical filtration systems or chemical treatment processes, mushroom-based filters require minimal maintenance and operate using natural biological processes. The low cost and ease of implementation make the technology particularly attractive for communities facing water quality challenges but lacking resources for expensive infrastructure projects.
As water quality concerns intensify globally due to agricultural runoff, aging sewage infrastructure, and population growth, nature-based solutions like fungal filtration offer promising alternatives to traditional engineering approaches. The successful trials in Devon and Lincolnshire provide a model that could be adapted to rivers and waterways worldwide, potentially transforming how communities approach water pollution remediation.