Reports were made of illegal fires being set and people leaving behind toilet paper and human waste.
At one point, nearly 100 tents were found at Tyninghame, which equated to about 300 people camping in an area with no toilet facilities.
Councillor Norman Hampshire was asked at a meeting of Dunbar Community Council about toilets at coastal car parks being closed.
Mr Hampshire, who represents the town on East Lothian Council, said that the local authority was doing “everything we can” to keep toilets open at areas such as Yellowcraig.
However, this was not helped by people vandalising the toilets, which resulted in them being closed.
Beaches like Yellowcraig are proving popular throughout the year. Copyright John Allan and licensed for reuse under this Creative Commons Licence.
The councillor noted the ever-increasing popularity of East Lothian to visitors.
He said: “Our car parks are virtually full the whole year round. It is still busy [at this time of year].
“We are putting more investment into creating more toilet facilities in coastal areas and keeping them to the highest standard.
“We do get commented on the toilet facilities in the area but it is a lot to keep them going and well maintained.
“We do everything we can with the staff available to ourselves.”