Police are searching for a repeat offender who dumped around 25 tonnes of waste between Long Melford and Sudbury.
The initial inquiries began earlier this month when 30 to 40 tonnes of industrial waste was dumped on a road in Walsham-le-Willows.
Inquiries identified who left the waste at the roadside but it became clear that the material was originally dumped on private land by someone else and then moved to the roadside.
Police are linking the original incident to another fly-tipping which took place between 5pm on Friday and 8am on Sunday.
The waste, which included plastic carpet shielding, plastic sheeting and paint pots, was dumped on a hard-standing area off the A134 between Long Melford and Sudbury.
Rural crime officer Pc Mark Bryant said: “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. I would urge anyone with information to contact us immediately.”