Beijing's water hardness not cause of lithiasis, says BWA head

An analyst tests the quality of a water sample. Photo: Xinhua


Beijing’s water hardness which is far below national standards is not a cause of lithiasis, Cheng Jing, head of the Beijing Water Authority (BWA), said at a conference yesterday.


"The hardness of Beijing’s tap water stands at around 320 ppm, below the national standard of 450 ppm. It is also far below international standards," Cheng said, addressing concerns that the high water hardness will lead to diseases like lithiasis.


According to Cheng, based on the research by the health authorities, the correlation between water hardness and lithiasis is not scientifically proved.


Beijing has recently released information on water quality to the general public. The information contains the maximum value and the minimum value of seven major indexes which include turbidity, chrominance and hardness.


Some residents are questioning the credibility of the information, arguing that no third-party supervisory organization participates in the water quality monitoring across the city.


Cheng said that the statistics about Beijing’s water quality issued by the only independent monitoring organization were transparently gained from a wide range of sources including municipality-owned waterworks and district-run waterworks.


Cheng admitted that the tap water supplied to some terminal users might be contaminated in the supply process due to poor infrastructure and old pipe network, and pledged to make every possible effort to solve the problem through demolition of dilapidated housing and upgrade of ageing infrastructure.


"Beijing will take measures to secure the high quality of tap water in next year’s flood season when the water from China’s South–North Water Transfer Project will be supplied into the city," Cheng said.


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