River Taff pollution source has stopped, but damage checks continue

The source of kerosene pollution affecting the River Taff has stopped, Natural Resources Wales confirmed on Wednesday 21 October. Investigators are still assessing the environmental damage and how the fuel entered underground drains. The incident began on Friday 16 October. NRW says fuel mixed with water in the drainage system and escaped into a nearby culvert and tributaries at several points, making the investigation complex.

What the ecological checks show so far

Officers have observed fewer than 10 dead fish. That is the number seen so far, not a final death toll or a measure of the total damage. Early findings also suggest effects on aquatic invertebrates that may be linked to the incident. NRW says further sample analysis and assessments are continuing to establish immediate and longer-term impacts. Stopping the source does not establish that the river has fully recovered.

Public health advice remains conditional

Public Health Wales’ advice, published on 19 October, is to avoid contact with affected water. Residents who can smell kerosene are advised to keep doors and windows closed while the odour is present, then reopen them once it has passed. If affected water comes into contact with clothing or skin, PHW advises removing the clothing and washing exposed skin with soap and water. Anyone who feels unwell or is concerned about symptoms should contact NHS 111 Wales. The advice should not be read as an all-clear following the source being stopped.