Discount retail chain Poundstretcher has been fined £15,000 for dumping rubbish outside a store in Leeds.
The company was also ordered to pay £1,500 costs at Leeds Magistrates' Court on Wednesday after being prosecuted by Leeds City Council.
The company admitted failing to store waste in a suitable manner at Crown Point Retail Park in Hunslet Road.
The court heard that large amounts of waste were found in the back yard, despite nearby bins being left empty.
An officer from the council's environmental action team visited the store in January and then in June and on both occasions found that staff had littered the site with waste.
The company had been issued with a notice in November 2009 requiring it to store its waste in appropriate bins.
Councillor Tom Murray, Leeds City Council's executive board member for environmental services, said: "The vast majority of businesses take their duty of care seriously and ensure that Leeds is kept clean, but a minority let everyone else down.
"I truly hope the size of this fine, one of the largest we've seen in some time, sends out a very clear message to businesses - you are responsible for your waste and we will take action when you fail in that responsibility."