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Objective To know the drinking water safety of water plants in Zhejiang and to provide the scientific data for government decision-making.Methods By the nonrandom sampling,the water plants were selected,103 in 2002,102 in 2003, 138 in 2004,419 in 2005,and 555 in 2006.The quality of tap water,product water and source water was determined according to the related standards.Results The eligible rate of product water and tap water in 2002 was 85.4%and 81.7%respectively,in 2003 it was 83.3%and 90.2%respectively,in 2004 it was 70.9%and 69.9%respectively,in 2005 it was 62.5%and 73.5% respectively,in 2006 it was 36.8%and 48.4%respectively.The eligible rate of source water was 68.1%.Conclusion The main problem in drinking water safety in Zhejiang is that the water supply systems in the rural areas are not good enough,no water treatment and disinfection is still common.
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Objective To investigate the water quality of finished water of the centralized water supply system in Shenzhen according to 106 indexes of water quality standards of China.Methods The collection and preservation of water samples was according to the standard examination methods for drinking water-collection and preservation of water samples (GB/T 5750.2-2006).The sanitary quality of the finished water samples collected from 35 centralized water supply systems in cities were determined and evaluated according to the Standards for Drinking Water Quality (GB 5749-2006) in May of 2008.Results The average qualified rate of drinking water was 82.9% (29/35) in Shenzhen.Among 106 indexes,4 indexes (such as turbidity,aluminum,manganese and free chlorine residue) exceeded the standard limits in degrees in some centralized water supply system.Conclusion According to the results of the present paper,it is considered that the water quality of the product water from the centralized water supply system in Shenzhen is good.
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Objective To explore the water quality of the product water from the centralized water supply system in Hunan, 2006. Methods The sanitary quality of the product water samples collected from 28 centralized water supply system in cities and 39 centralized water supply system in counties in Hunan, 2006, which distributed among the area of Xiangjiang River, Zishui River, Yuanjiang River and Lishui River, were determined and evaluated according to the Standards for Drinking Water Quality (GB5749—2006). Results The eligible rate of the water sample was 70.1%. Among 74 water quality indexes, 12 indexes (such as antimony,aluminum,pH value,manganese and so on) exceeded the standard limits in degrees in some centralized water supply systems. Most of the routine indices of water quality were unqualified and the reference indices were qualified. The quality of some water samples presented statistical difference in some indices (such as aluminum, sulphate, arsenic, et al) among 4 different river areas in Hunan province (P