Cardiff Council is trying to find out who owns the land next to a major railway line that was desecrated so much it became infested with rats.
Fly-tippers dumped supermarket trolleys along with rubble and household waste on the site in the Welsh capital.
The council was due to stage a huge clear-up this week and erect concrete barriers to prevent further mess building up there.
And it was determined to work out who owned the land so it could pass on part of the estimated £3,200 cost of the operation.
Cardiff Council chief regulatory services officer Malcolm Evans said: The matter was investigated by the Pollution Control Division on August 18, as there were reports and sightings of a high number of rats.
When the waste has all been cleared, the land will be secured by heavy concrete barriers to prevent further fly-tipping, costing the tax payer approximately £1,700. The cost of the clear up and landfill costs of the collected waste has been estimated at £1,500. This cost will be charged to the owner of the land, once the owner has been established through our investigation.