The Shadow of Groundwater: The Tokorozawa Disaster Prevention Well Contamination Incident and Environmental Anxiety in the 1990s (June 1998)

The Shadow of Groundwater: The Tokorozawa Disaster Prevention Well Contamination Incident and Environmental Anxiety in the 1990s (June 1998)

In the late 1990s, amid the stagnation that followed the collapse of Japan's bubble economy, concerns about the living environment and health grew, and the risks posed by chemical substances in particular attracted attention. While dioxin and environmental hormones were becoming social problems, the detection of the carcinogen chloroethylene in a disaster prevention well in Tokorozawa City, Saitama Prefecture, shocked people. The wells, which were supposed to protect lives in the event of a disaster, became a symbol of anxiety, bringing into sharp relief the reality that groundwater contamination originating from former factory sites and industrial waste is threatening the lives of residents in urban and suburban areas.

At the time, the Environment Agency was considering the introduction of a PRTR (Pollutant Release and Transfer Register) system and was trying to put in place a system that would require businesses to report the amount of chemical substances they emit. The Tokorozawa case served as on-the-spot evidence to encourage institutionalization, and research into the practical application of activated carbon adsorption, air sparging, and soil washing as groundwater purification technologies was progressing. It was also linked to the nationwide dioxin epidemic, which provided an opportunity for citizens' movements and local governments to push for stricter regulations. This incident, which shook the safety of familiar water, strongly impressed upon society that environmental issues are not abstract discussions, but are directly related to our daily lives.