Because of the lack of hazardous waste treatment facilities in Thailand, in the early 1990s, the Ministry of Industry (MOI) strongly encouraged all factories classified
as hazardous waste generators, according to the Ministry of Industry Announcement No. 25 (1988), to have on-site storage facilities where hazardous waste could be stored until treatment facilities were constructed. Many national and multinational firms in Thailand responded by storing waste at on-site landfills and in storage facilities. Unfortunately, however, reports of hazardous waste dumping on
public land (i.e., in municipal landfills, or close to public
parks) are not uncommon.