The Environment Agency has been on the River Ouse monitoring elevated ammonia levels.
It comes as Yorkshire Water said it identified the pollution in its raw water supply and shut down its water treatment works to protect water quality.
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As reported by The Press, some residents of Easingwold, Tollerton and surrounding areas with no or low water pressure overnight on Monday, June 22 and yesterday.
This morning, a Yorkshire Water spokesperson said: “”Water pressure for customers in Easingwold, Tollerton and the surrounding areas is now back to normal, and we have closed bottled water stations.
“The water quality in the taps meets our usual high standards, as it has throughout the last few days, despite the lower pressures.”
“We still have a presence in the area finding and fixing leaks to help the system continue to recover. We’d like to thank customers in the area for their understanding and patience while we dealt with the issues caused by the third party pollution in the area, particularly during the current high temperatures.”
Ammonia is a sharp‑smelling chemical found in sewage and fertilisers which, at high levels in the river, can damage fish and other wildlife.
A spokesperson for the Environment Agency said: “Our officers have been on site monitoring elevated ammonia levels in the River Ouse and working hard to identify the source of the pollution.
“We are investigating the incident and will not hesitate to take enforcement action if appropriate.”
The spokesperson added that its officers have been monitoring various locations on the River Ouse, including upstream of Beningbrough.
Environmental incidents can be reported to the Environment Agency via its hotline 0800 807060.
