Miller asked the government for help to remove the illegal tip before it caused a fire or was washed away into the river system.
Addressing MPs on Thursday, he said: “Criminals have dumped a mountain of illegal plastic waste… weighing hundreds of tonnes, in my constituency on a floodplain adjacent to the River Cherwell.
“River levels are rising and heatmaps show that the waste is also heating up, raising the risk of fire.
“The Environment Agency said it has limited resources for enforcement, that the estimated cost of removal is greater than the entire annual budget of the local district council.”
Environment minister Mary Creagh said the government had inherited a failing waste industry that had caused an “epidemic of illegal fly-tipping”.
She told MPs the agency had served a restriction order to prevent further access to the site.
