Analysis on sanitary conditions of drinking water in Baiyun District of Guangzhou City

[Objective]To understand the sanitary conditions of drinking water in Baiyun District of Guangzhou City,provide the basis for improving the drinking water quality.[Methods]The water samples were collected and detected according to the Standard examination methods for drinking water( GB /T 5750-2006),and were evaluated according to the Drinking water sanitary standard( GB/T 5749-2006).[Results]A total of 1503 water samples were detected during 2009-2012,and 1107 were qualified with the qualified rate of 73. 65%. The annual qualified rate was respectively 76. 66%,75. 15%,70. 78% and 70. 90%,and the difference was not statistically significant( χ2= 4. 844,P 0. 05). The qualified rate of peripheral water was the highest( 87. 31%),followed by secondary water supply( 77. 20%),deep well water( 57. 67%),product water( 51. 69%),mountain spring water(41.67%) and source water(31.96%),and the difference was not statistically significant( χ2= 219. 3,P 0. 01). As for the monitored items,the qualified rates in a descending sort were as follows: ammonia and nitrogen( 67. 48%),pH value(80.34 %),total bacterial count( 84. 30%),manganese( 92. 98%),total coliform bacteria colony( 93. 41%),turbidity(93.45%),free residual chlorine(93.70%). The qualified rates of other items were between 95% and 100%.[Conclusion]The qualified rate of drinking water is low in Baiyun District of Guangzhou City,and the unqualified items are mainly the ammonia and nitrogen,pH value,manganese,total bacterial count,turbidity and free residual chlorine. In the future,it is necessary to strengthen the health monitoring,and focus on protection and governance of source to improve the drinking water quality.