Residents living near the Downs have been warned not to dump rubbish at the beauty spot.
Old Town residents whose homes back on to the Downs have received a letter from Eastbourne Borough Council warning against dumping garden waste.
The letter, from Simon Hurt, Specialist Open Space Advisor, acknowledges that most householders dispose of their waste responsibly but says that on a significant number of times material from a few properties has been fly-tipped.
In a letter delivered to homes, Mr Hurt wrote, “We are lucky to live in a town with such beautiful countryside on our doorsteps and especially so now it is a National Park.
“That status and Eastbourne Borough Council’s long-standing desire to maintain our land to a high standard means that fly-tipping can spoil areas being managed for wildlife and recreation.
“Not only is fly-tipping illegal but it costs money to clear up that could otherwise be better spent.
“Garden waste on its own can introduce serious pests and diseases that affect local plant populations.”
He also said that if residents need a second fortnightly brown bin, they can have one at no extra charge.
A council spokesperson said, “The letters have so far been sent to homes with gardens that back onto the South Downs National Park and in areas where the problem has been reported.
“Fly-tipping is illegal and a threat to the natural environment that so many local people enjoy.
“There are also significant costs incurred when our contractors are required to clear illegally dumped waste.
“Every household in Eastbourne is entitled to up to two garden waste bins at no extra charge, so there is absolutely no reason to fly-tip waste over a garden fence.
“If the problem persists the council will consider other enforcement action.”