Police are renewing appeals after 30 to 40 tonnes of industrial waste were left on a road in Walsham-le-Willows earlier this month.
Enquiries have identified who left the waste at the side of Finningham Road on Thursday, April 9 after being unloaded by a tractor and trailer.
They will be formally interviewed by police and council officials, however it has become clear that the material was orginally dumped on private land by someone else and then moved to the roadside.
Police say they are continuing to look for the person who originally fly-tipped the waste.
They are also linking this incident to a second case where an estimated 25 tonnes of material was dumped on a hard-standing area off the A134 between Long Melford and Sudbury.
The waste, including plastic carpet shielding, plastic sheeting and paint pots, is thought to have been dumped sometime between 5pm on Friday, April 24 and 8am on Sunday, April 26.
Rural Crime Officer PC Mark Bryant said: “This is the second large find of waste and we suspect these two incidents may be linked. Someone must know who is responsible.
“With a total of more than 50 tonnes of waste, including similar items, being found at these two locations, there has to have been a re-fit or clear out of some scale and we’d ask caretakers and those in the carpeting and flooring industry in particular to come forward if you think you can help us trace where this has come from.
“Both of these incidents have taken a significant amount of time for the agencies involved to clear up. Acts such as this can cause serious damage to the local environment and pose a danger to road users and I would urge anyone with information to contact us immediately.”
Anyone who can help is asked to contact Suffolk Police on 101 quoting crime number ST/15/1091.
If you notice anything suspicious and suspect someone is fly-tipping please take the registration of any vehicle being used and contact police straight away by dialling 999.