Dead fish have been recovered from the River Taff as fuel from an unidentified underground source continues to enter the river. Pollution has been reported in areas including Nantgarw, Treforest, Taffs Well, Glan Y Llyn, Gwaelod-y-garth, and Tongwynlais since around 7.30pm on Friday.
Investigation ongoing to locate source
Natural Resources Wales (NRW) is investigating but has yet to find the underground source of the kerosene leak. Investigations are ongoing throughout the drainage system to locate the source. Images have shown shiny streaks of fuel within the water.
In their latest update, NRW say they are working to assess the leak's impact and coordinate action to control the pollution and stop fuel from entering the river. Evidence is being collected using drones and water sampling.
Dead fish recovered and analysed
As a result of the pollution, a number of dead fish have now been recovered from the river. They will be further analysed and kept for evidence, NRW say.
Absorbent materials have been put in place to try to contain the fuel. Specialist drainage and contractors are at the site and are actively recovering fuel from the on-site drainage system and removing it via tanker for off-site disposal, according to NRW. A spokesperson from NRW said that off-site disposal will continue as required throughout Sunday evening.
Containment efforts and public advice
Due to high flows and the width of the channel, the River Taff cannot be "boomed" with fuel absorbent barriers. Instead, a large quantity of fuel absorbents has been placed at the confluence between the impacted tributary and River Taff.
It is understood that action on Friday night and throughout the weekend has significantly reduced the amount of fuel entering the river. Public Health Wales continues to advise residents to keep doors and windows closed while the smell is present.
They stated: "Kerosene vapours may be mildly irritating to the respiratory system. Our current assessment is that people who can smell kerosene may experience temporary irritation, particularly if they are exposed for prolonged periods."
"As a precaution, Public Health Wales continues to work closely with Natural Resources Wales and other partners to assess the situation and monitor any potential impacts on public health."
"Public Health Wales advises residents to keep doors and windows closed while the smell is present and to open them again once the odour has passed."
"Anyone who feels unwell or is concerned about their symptoms should seek medical advice by contacting NHS 111 Wales." The investigation and action will continue.
