Study succeeds in quantifying human-specific faecal pollution

A pilot study undertaken by Water Research Centre (WRc) and ADAS Biotechnology has succeeded in quantifying concentrations of human-specific faecal genetic markers in river water, using microbial tracking.

Faecal pollution can originate from untreated sewage discharges, agricultural run-off or urban drainage. Pinpointing the source – humans, birds or livestock, for instance – will enable more targeted water quality management.

WRc senior water science microbiology consultant Daisy Allen said: “The study confirms that it is possible to identify specific sources of faecal contamination in UK waterbodies. This is important in efforts to manage and mitigate pollution, particularly considering that current regulation on microbial indicators, such as E. coli, does not distinguish between human and animal faecal sources.”

The trial focused on a 10km stretch of the River Ray in Wiltshire, in proximity to a sewage treatment works. During summer 2024, surface water samples were collected at three points. DNA was extracted from the water samples for analysis.

Allen commented: “There are numerous opportunities to expand the application of microbial source tracking across various industries.”