Legal analysis: The national standard for secondary water supply testing was put forward by People's Republic of China (PRC) and the Ministry of Health, and implemented from 1998 12 1. This specification specifies the sanitary requirements and water quality inspection method for building secondary water supply facilities.

Legal basis: Article 2 of the Standardization Law of People's Republic of China (PRC) The standards mentioned in this Law (including standard samples) refer to the technical requirements that need to be unified in agriculture, industry, service industry and social undertakings.

Standards include national standards, industry standards, local standards, group standards and enterprise standards. National standards are divided into mandatory standards and recommended standards, while industry standards and local standards are recommended standards.

Mandatory standards must be implemented. The state encourages the adoption of recommended standards.