Douglas council says it's reviewing CCTV to find out who contaminated a waste oil container at the Civic Amenity Site.
On Facebook, the local authority said someone had poured sand into the container at the weekend.
It means the oil can't be sent to the Energy from Waste facility.
The council says it's investigating the incident because the container will have to be sent off-Island to be decontaminated.
High ground could see 4 inches of snow on Saturday night
Mountain Road unlikely to open before Monday
Yellow warning for freezing temperatures tonight
School bangers night called off
AK47 and Uzi handed in to police
"No dispute" over Liverpool Ferry Terminal, says main contractor
More weekend bus strikes to come after 10-day walkout?
Minister to face question about bus strike