title: [The quantitative classification and survey of sanitation of urban secondary water supply in Haidian district of Beijing].
abstract: OBJECTIVE
  To investigate the sanitary status of urban secondary water supply facilities in Haidian district of Beijing.
  
  
  METHODS
  Adopting the quantitative classification table drafted by the Bureau for Sanitation Inspection and Supervision of Haidian district, we carried quantitative classification (A, B, C grade) on all 1725 secondary water supply facilities in Haidian district for two times. At the same time, we collected 20 residential areas with stratified random sampling method. As the public points in the first quantitative classification, the effect of level publicity on changing the sanitary grade of the secondary water supply facilities were observed.
  
  
  RESULTS
  In the first two times of quantitative classification, A-level and B-level secondary water supply facilities took up 81.04% (1398/1725) and 89.04% (1536/1725) of all secondary water supply facilities respectively; the ratio of effective sanitary permits achieved 86.14% (1486/1725) and 92.35% (1593/1725) respectively; and the ratio of effective water quality test reports achieved 86.60% (1494/1725) and 97.10% (1675/1725) respectively. There were 52 secondary water supply facilities in 20 collected areas, including 8 A-level, 27 B-level and 17 C-level secondary water supply facilities before level publicity, and 19, 29 and 4 after level publicity. The impact of level publicity on changing the sanitary grade of the secondary water supply facilities was statistically significant (χ(2) = 12.60, P = 0.002).
  
  
  CONCLUSIONS
  The city secondary water supply facilities in Haidian district are overall in good sanitary conditions. Quantitative classification and level publicity can effectively improve the sanitary status of secondary water supply facilities.
authors.affiliation: The Bureau for Sanitation Inspection and Supervision of Haidian District, Beijing 100037, China. miaomiao964@163.com
authors.forename: Miao-miao
authors.initials: MM
authors.lastname: Zhai
authors.forename: Yang
authors.initials: Y
authors.lastname: Zheng
authors.forename: Yong-quan
authors.initials: YQ
authors.lastname: Liu
authors.forename: Jia-sheng
authors.initials: JS
authors.lastname: Zhang
authors.forename: Xin
authors.initials: X
authors.lastname: Yang
authors.forename: Shi-jia
authors.initials: SJ
authors.lastname: Hao
authors.forename: Xu
authors.initials: X
authors.lastname: Wang
authors.forename: Jun-jie
authors.initials: JJ
authors.lastname: Kang
mesh_terms: D002681:China; D012499:Sanitation; D014504:Urban Health; D014881:Water Supply