The mayor of Hunters Hill is pushing for his council to take the NSW government to court over its failure to clean up a toxic site that risks leaching chemicals into Sydney Harbour.

Remnants of uranium and carbolic acid factories have left 7-9 Nelson Parade polluted with lead, arsenic and petrol chemicals and low-level radioactive material for more than a century.

The government has announced no firm plan on how to deal with the contamination at the Hunters Hill property. Credit:Anthony Johnson

But the government has announced no firm plan on how to deal with the contamination, 50 years after it was first identified and eight years after a parliamentary inquiry recommended it be cleared up as a priority.

Mayor Richard Quinn said he would move in a Monday council meeting to launch court action against the site's government owner, Property NSW, seeking enforcement of a 2014 clean-up order by the Environment Protection Authority.