Achievement rate for water quality standards in Japan FY 2012-2021

Published by
Catharina Klein,
Feb 1, 2023
In the fiscal year 2021, the achievement rate for water quality standards of waters in Japan amounted to around 88.3 percent. Lakes recorded the lowest achievement rate, while rivers had the highest rate in that fiscal year.

Achievement rate for overall water quality standards in Japan from fiscal year 2012 to 2021

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Source

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Release date

January 2023

Region

Japan

Survey time period

fiscal year 2012 to 2021; the Japanese fiscal year starts on April 1 of the stated year and ends on March 31 of the following year

Supplementary notes

The achievement rate was based on biochemical oxygen demand (BOD) for rivers, and chemical oxygen demand (COD) for lakes, and sea areas.

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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