www.mlit.go.jp/mizukokudo/mizsei/mizukokudo_mizsei_tk1_000055.html

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水資源：雨水利用の普及状況 - 国土交通省

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https://www.mlit.go.jp/mizukokudo/mizsei/mizukokudo_mizsei_tk1_000055.html

About this page

This page outlines rainwater utilization trends in Japan. Rainwater use began in the late 1960s and gained attention following drought crises like the 1978 Fukuoka drought. The Rainwater Use Promotion Act was enacted in 2014. As of the end of fiscal year 2024, at least 4,563 facilities nationwide utilize rainwater, with an annual usage volume of approximately 12.78 million cubic meters. The Kanto coastal region accounts for about 39% of facilities. Primary uses include toilet flushing and landscape watering. Rainwater utilization provides emergency water sources, water conservation benefits, and reduces concentrated stormwater runoff to sewers and rivers.