Water is indispensable to human life and production activities. The quality of drinking water is closely related to human health. Along with the social economic development, scientific progress and the improvement of people's living standards, people demand constantly improve the quality of the water for domestic and drinking water, drinking water quality standards and the continuous development and perfection. Because of drinking water quality standards and people's habits and customs, culture, economy, science and technology development level, water resources and water quality status, and other factors, not only between countries, and between different parts of the same country, there are differences to the requirement of water quality.