Which five categories of water quality are prescribed in China? What is the division standard?
1. Class 1 water quality: good water quality. The groundwater only needs to be disinfected, and the surface water can be cleaned and treated (such as filtration) and disinfected.
2. Type II water quality: The water quality is slightly polluted. After conventional purification treatment (such as flocculation, sedimentation, filtration, disinfection, etc.), the water quality is available to consumers.
3. Three types of water quality: Suitable for secondary protection areas, general fish protection areas, and swimming areas for centralized drinking water sources.
4. Four types of water quality: Applicable to general industrial protection areas and recreational water areas where the human body is not in direct contact.
5. Five types of water quality: Applicable to agricultural water areas and general landscape waters. Water bodies with more than five types of water quality standards have basically no function.
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