"This is just the beginning of a major operation that will take place on our territory and in Serbia," Obrenovac mayor Miroslav Cuckovic told state television (RTS).
"We will check all the sites where toxic waste could be concealed."
The environment ministry announced yesterday the dumped waste had been found, and analysis is under way to determine if the surrounding soil has been polluted.
Environment minister Goran Trivan said "an ecological disaster has been avoided," although he did not give details of the materials.
N1 reported the investigation will aim to determine where the waste came from.
The owner of the field has been arrested and faces a five-year prison sentence if he is prosecuted.
Serbia, which is negotiating its entry into the European Union, faces serious pollution problems, particularly due to years of neglect and a precarious economic situation.
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