Environment Agency officials are continuing to investigate the cause of fuel spillage from a major fire at a Sheffield waste management plant.
A fire at Frogson Waste Management on Douglas Road, Neepsend, last month resulted in thousands of tonnes of kerosene fuel running off into local drains and polluting the River Don around the Kelham Island area.
While the Environment Agency has previously said water quality in the river has not been significantly affected by the spill, it has now revealed there has been an impact on river insects.
Environment Agency team leader Ian Harrison said: “Our surveys have shown the numbers of river insects we’d expect to see at this time of year have been impacted on a stretch between Kelham Island and Effingham Road. We will carry out further monitoring next month to assess the river’s recovery.
“We are continuing to investigate the cause of the incident to establish whether any rules have been breached. Should any offences be found, we will consider the most appropriate course of action.”
Frogson’s has said early indications showed an electrical fault may have been to blame for the fire.