リスク学研究
Online ISSN : 2435-8436
Print ISSN : 2435-8428
原著論文
水道の水質異常時の給水停止や飲用制限に対する住民意識調査
金見 拓浅見 真理秋葉 道宏大野 浩一
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ジャーナル オープンアクセス

2021 年 31 巻 1 号 p. 11-30

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More than 100 water quality accidents caused by source water contaminants are reported annually in Japan. In the case of significant accidents, water suppliers have to decide whether to maintain water supply with a “Do Not Drink” alert or to suspend it. To acquire the basic data for decision-making, we conducted an internet questionnaire on public perception. The answers and properties of 1,104 respondents were collected considering area, age and gender distribution in Japan. And they were statistically analyzed with or without precedent conditions. The respondents were more likely to prefer water supply continuity when information was provided on its health effects compared to when there was only an announcement on the exceedance of the water quality standards. The confidence on ordinary tap water quality did not relate to the preference of water supply continuity. Meanwhile, elderly people and those who wanted to avoid toilet flush failure tended to choose water supply continuation. The preference of water supply suspension was more likely to be affected by the information provided than the respondents’ properties. Therefore, water suppliers need to consider the information provision in both before and after issuing an alert.

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