Tolka Valley Park suffers from chronic soil and water pollution. Sustainability policy prioritizes its environmental remediation, altering the function of this green space for surrounding communities. The Tolka River runs through a park on the northern edge of Dublin City, bordering an industrial estate, low-income residential areas and a newly-developed block of luxury apartments. The northeast of the park was a landfill decommissioned in the 1970s. The rest of the Park was used for illegal dumping and other criminal activities and was stigmatized as an unsafe place for years prior to its regeneration. The park had several environmental challenges.