Secondary water supply quality analysis in Xuanhua District of Zhangjiakou city during 2011-2013

Objective To understand the quality of secondary water supply in Xuanhua district,to provide scientific data for carrying out effective health supervision in future. Methods According to Hygienic standard for drinking water( GB5749-2006),the test results of secondary water supply in this area from 2011 to 2013 were analyzed and evaluated. Results A total of 183 water samples were detected,167 samples qualified,the average pass rate was 92. 3 %. The pass rate was 87. 5% in 2011,91. 9% in 2012,and 93. 8% in 2013,respectively,there was no statistic difference( P 0. 05). The unqualified items were mainly residual chlorine,the total number of colonies and coli forms,there were significant differences( P 0. 005). Conclusions The qualified rate of secondary water supply was high in Xuanhua district of Zhangjiakou city,but hygiene supervision need to be further strengthened,in order to improve the quality of secondary supply water.