In the fiscal year 2022, the achievement rate for the overall water quality standards in Japan amounted to around 87.8 percent. Lakes recorded the lowest achievement rate of approximately 50.3 percent. The achievement rate was based on biochemical oxygen demand (BOD) for rivers and chemical oxygen demand (COD) for lakes and sea areas.
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Achievement rate for water quality standards in Japan in fiscal year 2022, by category
Characteristic
Achievement rate for water environmental standards
fiscal year 2022; the Japanese fiscal year starts on April 1 of the stated year and ends on March 31 of the following year
Supplementary notes
The source provides the following calculation: achievement rate (%) = (number of water areas meeting the standards / number of water areas in a specified type) × 100
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MOE (Japan). (January 1, 2024). Achievement rate for water quality standards in Japan in fiscal year 2022, by category [Graph]. In Statista. Retrieved June 26, 2025, from https://www.statista.com/statistics/699120/japan-water-quality-standards-compliance-rate/
MOE (Japan). "Achievement rate for water quality standards in Japan in fiscal year 2022, by category ." Chart. January 1, 2024. Statista. Accessed June 26, 2025. https://www.statista.com/statistics/699120/japan-water-quality-standards-compliance-rate/
MOE (Japan). (2024). Achievement rate for water quality standards in Japan in fiscal year 2022, by category . Statista. Statista Inc.. Accessed: June 26, 2025. https://www.statista.com/statistics/699120/japan-water-quality-standards-compliance-rate/
MOE (Japan). "Achievement Rate for Water Quality Standards in Japan in Fiscal Year 2022, by Category ." Statista, Statista Inc., 1 Jan 2024, https://www.statista.com/statistics/699120/japan-water-quality-standards-compliance-rate/
MOE (Japan), Achievement rate for water quality standards in Japan in fiscal year 2022, by category Statista, https://www.statista.com/statistics/699120/japan-water-quality-standards-compliance-rate/ (last visited June 26, 2025)
Achievement rate for water quality standards in Japan in fiscal year 2022, by category [Graph], MOE (Japan), January 1, 2024. [Online]. Available: https://www.statista.com/statistics/699120/japan-water-quality-standards-compliance-rate/
