In recent years, water pollution in Beijing has become more and more serious, and the five major water systems have been polluted to varying degrees. The most obvious one is that Guanting reservoir can no longer be used as drinking water source.

　　Green home, a non-governmental environmental protection organization, confirmed yesterday that the water quality of rivers in the southeast of Beijing is almost inferior to class v. This judgment is based on the organization's ongoing field research.

　　"The public can clearly feel that the water in Beijing is not as clear as it used to be," Wang Jingjing, a green home volunteer from Beijing University of science and technology, told China business (microblog) daily

　　According to the data released by the Beijing Municipal Bureau of water affairs, the per capita water resources in Beijing has dropped to 100 cubic meters in 2011, much lower than the internationally recognized water shortage warning line of 1000 cubic meters per capita.

　　According to Zhang Tong, member of the Beijing Municipal Committee of the Chinese people's Political Consultative Conference and vice president of the Beijing Municipal Institute of water resources planning, design and research, Beijing's normal demand for water resources is between 5 billion and 6 billion cubic meters, but in the past 10 years, Beijing's real resources are only 2.1 billion cubic meters on average, with a large gap. At the same time, water pollution is also serious.

　　From June 2011 to may 2012, with the support of green home volunteers and WWF, volunteers will go to the rivers in the urban area of Beijing and the surrounding areas for investigation every Saturday during the "happy water trip" activity. The water samples will be taken back to the laboratory for testing. After the detection, the location of each river is marked by using GIS, and the water quality, measurement time, climate and location are marked.

　　There are more than 100 rivers in Beijing, which belong to the five major water systems in the Haihe River Basin (Yongding River, Ji canal, North Canal, Daqing River and Chaobai River). Wang Jingjing told this reporter that in recent years, with economic development, water pollution has become increasingly serious, and the five major water systems have been polluted to varying degrees. The most obvious one is that Guanting reservoir can no longer be used as drinking water source, but only for industrial water, agricultural irrigation and supplement of urban rivers and lakes. "It is worth noting that the water of Miyun reservoir is also beginning to have a trend of eutrophication."

　　According to the analysis, in addition to the decrease of rainfall, continuous drought and the increase of population, the aggravation of point source pollution is an important reason. Green home volunteer survey found that with the industry gradually leaving Beijing, domestic sewage has become the main source of water pollution in Beijing. Domestic sewage discharge is very large and widely distributed, with many small sewage outlets.

　　The North Canal is the main sewage river, mainly including Tonghui River, Xiba River and Qinghe River. The sewage here is directly discharged into the river without treatment, which seriously pollutes the water quality of the river. Most of the rivers in this area are inferior to class V water quality.

　　According to media reports, there are 75 sewage outlets in Shijingshan District of Beijing, and industrial wastewater is directly discharged into rivers. According to a data from Beijing Municipal Water Affairs Bureau, the daily treatment capacity of Qinghe sewage treatment plant is 450000 tons, while the peak sewage inflow in 2010 is 500000-700000 tons per day.

　　"The population of Beijing has reached 18 million 10 years ahead of schedule, but the sewage treatment planning is still carried out according to the original urban planning, which leads to the relatively insufficient sewage treatment capacity." Xiong Jianxin, deputy director of Drainage Department of Beijing Municipal Bureau of water affairs, said.

　　As an important drainage channel in the suburbs of Beijing, the water quality of rivers in the southeast of Beijing is almost inferior to class v. the water quality of rivers in the northwest of Beijing is relatively good, but there are still some rivers that are inferior to class v. The water quality of different rivers is different, which is mainly related to the source and function of river water quality.

　　According to the 2011 Beijing Environmental bulletin issued by the Beijing Municipal Environmental Protection Bureau, "the environmental quality of surface water in Beijing was slightly improved" in 2011, but it is still necessary to "deepen water pollution control and sewage recycling".

　　In order to improve the water environment, Beijing should further strengthen the supervision of the water quality of drinking water sources such as Miyun and Huairou reservoirs, improve the sewage treatment level of the city, and build the "four lakes and one line" project of Yongding River and the second phase project of diverting temperature and tide from the North Canal, the communique said. The Beijing municipal government recently announced that 18 sewage plants and 5 reclaimed water plants will be built in Beijing during the 12th Five Year Plan period.