The Environment Agency has been investigating eight recent incidents of illegal dumping, mainly of motor waste, in Heybridge and Great Totham.
A man was interviewed on Tuesday morning after his van was caught on video apparently taking waste to be fly-tipped.
The EA now believes it has enough evidence to take the suspect to court, where he could receive up to six months in jail and a £20,000 fine.
An appeal for information was made after eight drums with a combined capacity of almost 250 gallons were dumped filled with hazardous vehicle waste in Great Totham on the last weekend of October. The EA believes the van owner was responsible.