In the fiscal year 2021, the achievement rate for water quality standards of Ariake Sea amounted to 87 percent, making up the highest rate among sea areas in Japan. In the same fiscal year, the overall achievement rate for water quality standards of sea areas in Japan amounted to around 78.6 percent.
Achievement rate for water quality standards of sea areas in Japan in fiscal year 2021, by area
Characteristic
Achievement rate for water environmental standards
fiscal year 2021; the Japanese fiscal year starts on April 1 of the stated year and ends on March 31 of the following year
Supplementary notes
*Excluding Osaka Bay.
**Including Mikawa Bay.
For lakes, and sea areas, the achievement rate was based on the chemical oxygen demand (COD).
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, 2023). Achievement rate for water quality standards of sea areas in Japan in fiscal year 2021, by area [Graph]. In Statista. Retrieved December 26, 2024, from https://www.statista.com/statistics/1249247/japan-water-quality-standards-sea-areas-compliance-rate-by-area/
MOE (Japan). "Achievement rate for water quality standards of sea areas in Japan in fiscal year 2021, by area." Chart. January 1, 2023. Statista. Accessed December 26, 2024. https://www.statista.com/statistics/1249247/japan-water-quality-standards-sea-areas-compliance-rate-by-area/
MOE (Japan). (2023). Achievement rate for water quality standards of sea areas in Japan in fiscal year 2021, by area. Statista. Statista Inc.. Accessed: December 26, 2024. https://www.statista.com/statistics/1249247/japan-water-quality-standards-sea-areas-compliance-rate-by-area/
MOE (Japan). "Achievement Rate for Water Quality Standards of Sea Areas in Japan in Fiscal Year 2021, by Area." Statista, Statista Inc., 1 Jan 2023, https://www.statista.com/statistics/1249247/japan-water-quality-standards-sea-areas-compliance-rate-by-area/
MOE (Japan), Achievement rate for water quality standards of sea areas in Japan in fiscal year 2021, by area Statista, https://www.statista.com/statistics/1249247/japan-water-quality-standards-sea-areas-compliance-rate-by-area/ (last visited December 26, 2024)
Achievement rate for water quality standards of sea areas in Japan in fiscal year 2021, by area [Graph], MOE (Japan), January 1, 2023. [Online]. Available: https://www.statista.com/statistics/1249247/japan-water-quality-standards-sea-areas-compliance-rate-by-area/
