The Environment Agency (EA) has released a list of 117 waste sites "of concern" across England, collectively holding almost two million tonnes of refuse.
The EA says it has released the list to provide the public with better information about what sites it's investigating and improve intelligence gathering.
Some 13 of the 117 sites listed are in Kent, with eight in West Sussex and seven in Norfolk. East Sussex is home to six, and there are five each in Buckinghamshire and Surrey.
The sites have several different types of waste, including household, construction and commercial waste.
Sky has previously investigated mega dumps, including a 100,000-tonne dump near Epping in Essex, and in Bolton House Road in Wigan.
The EA has said all sites on the list will be reviewed every month.
The agency's chief executive Philip Duffy said: "Publishing this watchlist is a deliberate act of transparency - communities need to know that we are acting, and we want those committing these crimes to know that we are coming for them."
"We are using every tool at our disposal to find those responsible and encourage anyone with information to come forward," he added.
Details about the exact locations of some sites are restricted due to ongoing police and EA investigations.
Last week, Sky News revealed the existence of three new mega dumps being investigated by the Environment Agency - collectively weighing in at more than 120,000 tonnes.
The sites are in Ranskill in Nottinghamshire, Faversham in Kent, and Bracknell in Berkshire.
In a letter seen by Sky News from the EA to the House of Lords Environment and Climate Change Committee, the agency's chief executive Philip Duffy said there are a total of 537 illegal waste sites in the UK.
Read more:
Arrest over illegal waste site
Why mega dumps can't be stopped
Waste carriers face ID checks
This figure includes 28 mega dumps that are larger than 20,000 tonnes.
The EA's decision to identify the locations of 117 sites comes after it announced its 10-point plan to tackle waste crime in March.
More intelligence gathering, a more consistent and quicker response to dumping reports, and naming and shaming operators involved are amongst the measures to tackle the organised crime gangs behind the dumps.
(c) Sky News 2026: Revealed: 117 waste sites 'of concern' identified across England - is there a mega dump near you?<
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