The former GM site in St. Catharines, slated for homes, contained toxic chemicals and heavy metals at alarming levels, detected in 2010 and 2012. Despite this, the site was rezoned for residential use in 2020 without public knowledge of the contamination. A recent release of environmental assessment documents reveals the extent of the contamination, including carcinogens and other hazardous substances, raising concerns for public health and the environment.