Farmers have been warned over a scam involving the illegal storage of baled mixed waste.
Natural Resources Wales (NRW) has issued the warning after an increase in reports from landowners who have been approached in recent months to store baled mixed municipal waste, badged under the term RDF (Refuse Derived Fuel).
Individuals acting alone, or operating under a company name, are offering landowners money to store large quantities of RDF, claiming it is a temporary measure before the waste is sent for incineration.
A statement on the NFU Cymru website reads: "Landowners should be aware that the storage of RDF is tightly regulated, and an environmental permit is required in order to store the waste legally.
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"This is to make sure the material is managed and stored correctly to avoid pollution and fire risk. Landowners could find themselves risking enforcement action if they allow the storage to take place on their land.
"In some instances, this has been found to be a scam and the waste will never be collected leaving landowners with substantial clean-up costs to dispose of the waste."
Farmers are advised to refuse the storage of baled mixed municipal waste, even on a short-terms basis.
NRW encourages anyone approached to store RDF or any other waste type on their land to report it immediately so they can investigate further.