Activist group Residents against Toxic Scheme (Rats) has fought for 15 years to stop potentially harmful rubbish being brought on to Welbeck landfill site.
Waste Recycling Group (WRG), which runs the tip, has announced that some of the toxic waste will now be banned from being taken there.
The firm is applying for a new permit which will only allow non-hazardous household, commercial and industrial rubbish on the site.
Rats chairman Paul Dainton said: "We are highly delighted. We believe it is because we have caused them so many problems and claim this as a victory for our campaign against what has been happening at Welbeck.
"I am 60 next month and this is the best birthday present I could have asked for. It is brilliant news that quantities of toxic waste are no longer going into Welbeck."
Mr Dainton said there was still an issue over waste falling into the river and the site was not being covered properly.
He hoped the Environment Agency would deal with these problems so that the Rats group could concentrate on other topics.
Rats announced in March that it would no longer actively campaign, partly due to its success in a long-running battle to prevent an incinerator being built on the site.
But the group still performs a watchdog role.
Barbara Jodrell, chairman of Normanton Environmental Societies Together, said: "This is great news and we have only achieved it through the efforts of Rats and the public."
Under the new licence WRG will not allow things like cement-bonded asbestos or filter residue from water treatment on to the site.
The company said it was a very minor change to the permit which the site currently operates under.
Phil Darwin, regional operations manager, said: "There have been many allegations made against this site over the years, especially ones referring to the types of waste Welbeck has accepted.
"We have only ever taken the wastes allowed by our permit.
"The wastes we are no longer allowed to take were only ever a very small proportion, around three per cent, of the total waste received."
He said WRG was fully committed to operating Welbeck landfill to the highest environmental standards, and was working with Wakefield Council to improve recycling and recovery rates.