A drainage problem at the Grand Hotel has seen sewage spill on to the Pier Pavilion site
A sewage leak next to Llandudno Pier has caused a stink with concerns over the smell and potential leaks into the sea.
Council officers were called to the Pier Pavilion site where sewer waste had been seen on the land.
There had been claims it was related to groundworks on the site ahead of a planning application for a controversial restaurant and housing scheme at the location.
But officers at Conwy council say the problem was due to defective drainage from the Grand Hotel and not connected in any way to the works on the Pier Pavilion land.
Llandudno Pier boss Adam Williams warned that the problem had to be dealt with or it risked causing damage to tourism at that end of the resort.
He said: "Wherever the fault lies this needs to be sorted out as soon as possible, it smells now on a dry day, imagine what it will be like when it warms up.
"This has the potential to cause serious harm to the pier and the resort if this drags on.
"There is also a risk of sewage leaking down into the sea which could impact on the water quality."
A spokeswoman from Conwy council said: "The Council did receive reports of a sewage leak.
"Upon investigation, officers were able to confirm that the problem was related to defective drainage from an adjacent property; we are satisfied that they are taking all steps to resolve the problem.
"We will continue to monitor the situation and ensure that all relevant works are completed."
Britannia Hotels, which owns The Grand, has not responded.
Alan Waldron, the developer behind the Pier Pavilion development, was unavailable for comment.
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