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Share of polluted surface water in China 2013-2017, by region

In 2017, Tibet ranked first in terms of water quality among Chinese provinces and municipalities. In Tibet, 100 percent of the water was suitable for human drinking.

Percentage of polluted surface water in China in 2013 and 2017, by region

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Release date

September 2020



Survey time period

2013 and 2017

Supplementary notes

*2014 and 2017 data.
**2015 and 2017 data.

Polluted surface water refers to surface water with a Water Quality Index (WQI) of grade IV or worse.

The water quality index (WQI) or water quality standard (WQS) is a five-level grading system that measures the quality of a water body.

WQI levels:
I and II: Excellent
III: Good
IV: Lightly polluted
V: Moderately polluted
Worse than V: heavily polluted

The source does not provide a release date. The date given is the date of data access.

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