The Environmental Protection Agency (EPA) has asked Uisce Éireann (UÉ) to investigate reports of pollution into the River Ilen in Skibbereen.
A brown discharge was reported on Monday July 20th in the River Ilen, and a short time later in the Caol Stream running through the town centre.
Cork Councty Council carried out investigations at the River Ilen.
The council confirmed that environmental officers carried out investigations at the River Ilen, identifying the discolouration in the water as algal bloom.
'This occurs naturally in coastal and inland waters and is associated with nutrient in the water and high temperatures. No pollution was evident,' a council spokesperson said.
An eyewitness, who asked not to be named and alerted Inland Fisheries, said: 'I saw raw sewage in the water.'
The suspect discharge was initially believed to be slurry or raw sewage and its source was traced to a pipe at the junction of Baltimore Road and the town car park, the eyewitness said.
The EPA said it requested UÉ to investigate, and UÉ subsequently reported that its Network Operations Team carried out an investigation but 'no issues were identified during these inspections'.
Inland Fisheries Ireland were contacted for comment.
