The state government has revealed the company responsible for the contamination of West End’s Riverside Drive cannot be pursued for remediation as it no longer exists.

The site was home to a coal tar processing plant until its closure in 1986, during which years of chemical processing saw heavy metals and hydrocarbons leech into the soil.

Brisbane City Council has said it will continue to work with both the state government and adjoining private property owner to ensure remediation of the land.