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The average water consumption volume per person in Japan amounted to approximately *** liters per day in the fiscal year 2020. Figures decreased compared to around liters in fiscal year 2010.
The coastal Kanto region represented the region with the highest water consumption, likely because the metropolitan area of Tokyo is densely populated and constitutes one of the main industrial centers on the archipelago.

 Water supply

In Japan, tap water is strictly controlled under the Water Supply Act, which regulates all water supply systems, the construction of water supply facilities, as well as hygienic measures. In recent years, over ** percent of the Japanese population had access to drinkable tap water. Most of the tap water was supplied using waterworks, while a smaller amount was supplied with small-scale water supply systems as well as private water supply systems.

 Wastewater management and water pollution

In recent years, over ** percent of Japanese citizens were served by wastewater treatment systems, with sewer lines representing the most widely accessed wastewater treatment facilities.
Water pollution has become an environmental issue worldwide. In Japan, marine pollution is mostly caused by oil and waste, often disposable plastic waste. To counteract water pollution, the Japanese government started to invest in pollution control technologies, domestic wastewater treatment systems, as well as educating the public and businesses about the importance of reducing, and recycling waste.