In the fiscal year 2023, approximately **** percent of the Japanese population was served by wastewater treatment systems, indicating a steady increase since fiscal 2013. Reaching almost *** percent, ***** Prefecture had the highest population share with access to wastewater treatment in that year.
fiscal year 2014 to 2023; the Japanese fiscal year starts on April 1 of the stated year and ends on March 31 of the following year
Supplementary notes
**In fiscal year 2011, Iwate and Fukushima prefectures were out of the scope of the survey to tabulate because the prefectures were affected by the Great East Japan Earthquake.
***In fiscal year 2012, 2013 and 2014, Fukushima prefecture was out of the scope of the survey to tabulate because the prefecture was affected by the Great East Japan Earthquake.
****In fiscal year 2015, the following cities, towns and villages in Fukushima prefecture couldn't be surveyed because the municipalities were affected by the Great East Japan Earthquake: Soma, Minamisoma, Hirono, Naraha, Tomioka, Kawauchi, Okuma, Futaba, Namie, Katsurao and Iitate.
Figures prior to fiscal year 2021 come from previous reporting.
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MOE (Japan). (August 31, 2024). Share of population served by wastewater treatment systems in Japan from fiscal year 2014 to 2023 [Graph]. In Statista. Retrieved June 27, 2025, from https://www.statista.com/statistics/700287/japan-population-rate-served-by-wastewater-treatment-systems/
MOE (Japan). "Share of population served by wastewater treatment systems in Japan from fiscal year 2014 to 2023." Chart. August 31, 2024. Statista. Accessed June 27, 2025. https://www.statista.com/statistics/700287/japan-population-rate-served-by-wastewater-treatment-systems/
MOE (Japan). (2024). Share of population served by wastewater treatment systems in Japan from fiscal year 2014 to 2023. Statista. Statista Inc.. Accessed: June 27, 2025. https://www.statista.com/statistics/700287/japan-population-rate-served-by-wastewater-treatment-systems/
MOE (Japan). "Share of Population Served by Wastewater Treatment Systems in Japan from Fiscal Year 2014 to 2023." Statista, Statista Inc., 31 Aug 2024, https://www.statista.com/statistics/700287/japan-population-rate-served-by-wastewater-treatment-systems/
MOE (Japan), Share of population served by wastewater treatment systems in Japan from fiscal year 2014 to 2023 Statista, https://www.statista.com/statistics/700287/japan-population-rate-served-by-wastewater-treatment-systems/ (last visited June 27, 2025)
Share of population served by wastewater treatment systems in Japan from fiscal year 2014 to 2023 [Graph], MOE (Japan), August 31, 2024. [Online]. Available: https://www.statista.com/statistics/700287/japan-population-rate-served-by-wastewater-treatment-systems/
