What is the lowest utilization rate of non-traditional water sources in green buildings?

Green Building Evaluation Standard GB/T50378-2006 quantifies non-traditional water utilization technology with non-traditional water utilization rate as an index. Non-traditional water utilization rate refers to the percentage of water supply that recycled water, rainwater and other non-traditional water sources replace municipal tap water or groundwater for landscape, greening, toilet flushing and other miscellaneous purposes.

The "green" of "green building" does not refer to the three-dimensional greening and roof garden in the general sense, but represents a concept or symbol. It refers to buildings that are harmless to the environment, can make full use of environmental natural resources, and do not destroy the basic ecological balance of the environment. It can also be called sustainable development building, ecological building, returning to nature building, energy-saving and environmental protection building, etc. The green building evaluation system has six indicators, which are divided into three stars, two stars and one star from high to low.