The drivers or operators of almost 90% of commercial vehicles stopped during a recent check in Hertfordshire have been reminded of the law on carrying waste.
Some 33 van and lorry drivers were stopped at Borehamwood in the latest series of inspections on their vehicles and paperwork.
Half a dozen drivers had missing or incomplete documents, and will be investigated by Environment Agency officers, while letters will be sent to another 23 as a general reminder to register if they want to transport waste.
Any van or lorry moving waste commercially should be registered by law to ensure it is disposed of correctly, or be subject to further action by the Environment Agency.
The checks took place in the car park of Morrisons in Borehamwood, with environment officers joined by colleagues from Hertfordshire Police, Hertsmere Council and the Driver Vehicle and Standards Agency.
The inspections were designed to disrupt waste crime, and prevent dangerous vehicles from being on the road.
Hannah Wooldridge, a senior technical officer for Environment Agency in Hertfordshire, said:
The results from our latest checks on lorries and vans in Hertfordshire prove the worth of finding out if drivers and operators are working within the law when carrying waste on board.
We want to make it very clear to people that everyone has a duty of care to ensure their waste is managed and disposed of correctly by the people who take it away.
You risk a £5,000 fine if you use illegal waste carriers to remove your rubbish. You need to check they are a registered waste carrier with the Environment Agency, and provide you with a waste transfer note saying where they are taking the waste.