The Environment Agency (EA) suspects the involvement of organised crime in 35 large fly-tips found across 73 miles of south-east England
A spokesman said the dumps had been found in an area stretching from Odiham, Hampshire, to High Wycombe, Buckinghamshire and Bexley, Kent.
EA staff strongly suspected a link as all the incidents involved shredded waste and evidence indicated the same vehicles were involved.
A 44-year-old man from Maidenhead was arrested last week by Thames Valley Police, and the EA said investigations were continuing with a tipper lorry and van having been seized.
The spate of incidents started in March when a dump was found at West Horsley (pictured) and other places in Surrey.
EA area enforcement manager Emma Viner said: “We are pleased a suspect has been arrested in connection with a number of suspected large-scale illegal dumping incidents.”