Ministers are considering the need for an investigation into the suitability of the 1,000-acre Strathallan Castle Estate for a festival, which attracts 85,000 music fans.
Asbestos was found at the site recently and as promoters did not need to apply for planning permission to relocate the festival, some locals believe there should be a full examination of the estate.
The contamination has been confirmed by the Scottish Environment Protection Agency (Sepa), who said it had received a complaint regarding asbestos waste on the site of a former farm landfill at Strathallan Castle Estate in Perthshire.
A spokesman said: "On inspection by Sepa officers, asbestos and other waste was found at the site and the landowner has been asked to remove this, while ensuring any asbestos is taken to an appropriate facility for safe disposal. Sepa officers will continue to monitor the site while this is ongoing."