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
Citation formats
Achievement rate for water quality standards in Japan FY 2022, by category
In the fiscal year 2022, the achievement rate for the overall water quality standards in Japan amounted to around **** percent. Lakes recorded the lowest achievement rate of approximately **** 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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MOE (Japan). (January 1, 2024). Achievement rate for water quality standards in Japan in fiscal year 2022, by category [Graph]. In ÌÇÐÄÆƽâ°æ. Retrieved July 26, 2026, from /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. ÌÇÐÄÆƽâ°æ. Accessed July 26, 2026. /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 . ÌÇÐÄÆƽâ°æ. ÌÇÐÄÆƽâ°æ Inc.. Accessed: July 26, 2026. /statistics/699120/japan-water-quality-standards-compliance-rate/
MOE (Japan). "Achievement Rate for Water Quality Standards in Japan in Fiscal Year 2022, by Category ." ÌÇÐÄÆƽâ°æ, ÌÇÐÄÆƽâ°æ Inc., 1 Jan 2024, /statistics/699120/japan-water-quality-standards-compliance-rate/
MOE (Japan), Achievement rate for water quality standards in Japan in fiscal year 2022, by category ÌÇÐÄÆƽâ°æ, /statistics/699120/japan-water-quality-standards-compliance-rate/ (last visited July 26, 2026)
Achievement rate for water quality standards in Japan in fiscal year 2022, by category [Graph], MOE (Japan), January 1, 2024. [Online]. Available: /statistics/699120/japan-water-quality-standards-compliance-rate/
