Investigators believe a massive illegal dump near the Norfolk-Suffolk border is linked to waste crime at other locations.
The Environment Agency has confirmed its probe into the site at Stockton, on land just off the A143 between Great Yarmouth, Lowestoft, and Beccles, is continuing.
The site, owned by Peter Dive, was left buried under an estimated 1,200 tonnes of household, commercial, and recycling waste.
The dumping is believed to have taken place while Mr Dive was away working on another project.
Three men were arrested earlier this year in connection with the case.
An Environment Agency spokesman said: "The public rightly want action on illegal waste dumps and related criminality and nuisance.
"We are turning the tide to show the shameless people who dump waste in the countryside, and permitted businesses causing disruption to communities that we are on their tail.
“The Environment Agency has successfully prosecuted almost 20 companies and people for waste crime in East Anglia since 2023, with fines of nearly £98,000 handed out by courts."
The Stockton site has previously been placed on the Environment Agency's list of high-priority waste locations, causing concern to local communities.
Mr Dive, who brought the four-acre plot in 2021 with plans to eventually build an eco-home, has previously estimated it could cost around £500,000 to clear the waste.
The landowner believes his plot could have been targeted because certain contractors were aware he wasn't in the area.
Documents and letters discovered among the rubbish allowed some of the material to be traced back to Bedfordshire.
The spokesman added: “Our work continues to strengthen prevention, improve detection and remove permits to operate if necessary.
"But we need businesses to make sure their waste doesn’t end up on illegal dumps, and the public to report suspicions of waste crime and concerns about waste companies to us in confidence on 0800 807060, or CrimeStoppers on 0800 555111.”
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