About 50% of China's water sources are polluted
Surface water sources: About 50% of China's water sources are polluted, with hundreds of organic compounds and heavy metal ions entering the water source.
Underground water source: fluorine, arsenic, iron, manganese, etc. exceed the standard
Among the more than 4000 waterworks above the county level, 98% still use traditional water treatment technology. If the water source is polluted by heavy metal ions and organic compounds, the traditional technology will be inadequate.
Scholars believe that at least 20% to 30% of water plants need to be advanced as soon as possible.
The survey shows that the quality of China's urban water supply network is generally inferior, with 50.80 per cent of gray cast iron pipes that do not conform to the national standard, 13 per cent of ordinary cement pipes and 6 per cent of galvanized pipes.
The old pipe network leaks seriously and often bursts. From the perspective of water quality, it is prone to secondary pollution.
From 2000 to 2003, 4232 secondary pollution incidents occurred in 184 large and medium-sized cities in China. Secondary pollutants are mainly microorganisms, which can be killed by boiling water.
In China's provincial capital cities, each city has thousands of water tanks or reservoirs, and secondary pollution incidents of water tanks have occurred frequently in recent years. The supervision of secondary water supply facilities in cities is weak.
No city in mainland China has achieved direct drinking water. Boiling water can kill microbial pollution, but it cannot remove organic pollutants and heavy metal ions.
Many organic pollutants accumulate to a certain extent in the human body, which may be carcinogenic, teratogenic and mutagenic.