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本文通过对国内１２０起二次加压供水污染事故的分析，总结出造成污染事故发生的主要原因为：基础设施设计及安装不合理（Ｘ１）、水箱存在被污染的隐患（Ｘ２）、卫生管理不善（Ｘ３）。进一步推导出二次加压供水污染的危险性指数，即二次加压供水卫生管理指数：Ａｉ＝０．７１Ｘ１＋０．０５Ｘ２＋０．２４Ｘ３，并提出了使用该指数的方法。应用此指数对某市二次加压供水进行了卫生学评价，表明该市二次加压供水卫生管理指数为１．０１，属警报水平（Ⅲ级），同时也指出了该市二次加压供水的重点监督对象和治理的重点。
Based on the analysis of 120 domestic secondary pressurized water supply pollution accidents, the paper summarizes the main reasons causing pollution accidents as follows: infrastructural design and installation (X1), contamination of water tank (X2), health management Bad (X3). The risk index of secondary pressurized water supply was further deduced, that is, the hygienic management index of secondary pressurized water supply: Ai = 0.71X1 + 0.05X2 + 0.24X3, and put forward the method of using this index. Applying this index to the second pressurized water supply in a city, the hygienic evaluation shows that the city’s secondary pressurized water supply hygienic management index is 1.01, which belongs to the alarm level (Ⅲ level), and also points out that the city’s secondary plus The focus of supervision and object of pressure water supply and governance focus.