A builder was convicted of fly-tipping after allegedly being linked by an invoice and a bank paying-in book among the waste.
Oswyn Gryffudd Williams, aged 43, of Maes Meurig, Gwalchmai, Anglesey, denied responsibility but was found guilty at Caernarfon crown court of illegally dumping waste - rubble, plasterboard, green waste and old clothing - at Clegir Mawr, Gwalchmai.
In August 2015, Anglesey council had been informed that piles of waste had been dumped in a lay-by.
The prosecution is seeking £7,259 costs.
Judge Tracey Lloyd-Clarke bailed Williams for an “all options” pre-sentence report.
He will be sentenced at Mold crown court on March 28.
Defence barrister Gareth Roberts said: ”This is the first time he’s been convicted of this type of offence.”