The Environment Agency took E J Shanley & Son to court after an officer found that the firm had breached a number of its permit conditions and that the site was poorly run. He even found rats running around the site.
In 2007 the transfer station accepted nearly 13,500 tonnes but the limit in any one year is 5,000 tonnes.
Chippenham magistrates fined the firm £25,000 after it pleaded guilty to five offences under the Environmental Permitting Regulations 2007 including depositing waste outside a permitted area, failure to maintain tipping bay walls, exceeding the tonnage limit, failing to control rat infestation and allowing litter to escape from the site.
EA officer Chris Povey said: The site was being run significantly below the standard expected and this was reflected in the number of permit breaches found during our visits. Excessive quantities of waste were being brought to the site and this probably contributed to the deterioration in standards.
It is the second time E J Shanley & Son has been prosecuted by the EA in the past year. In June 2008, the firm was ordered to pay £41,813 in fines and costs for operating an illegal waste transfer station at a scrap yard in Warminster, Wiltshire.