一、About quality of water supply
For a long time, China's urban water supply and water supply systems have adopted a unified way, that no matter what purpose are supplied in accordance with the drinking water standards. In the last period of economic underdevelopment, little water, use a single type of situation, the use of this approach is feasible. Today, the quality of water is very tense, but under conditions of water use is becoming more diverse, yet unified water supply, not only a waste of water resources, but also a waste of manpower, material and energy.

The so-called quality of water supply, mainly refers to the quality of water in the area and public buildings (hotels, offices, government agencies, etc.) inside. Water supply mainly bottled water and piped water. Currently, Shanghai and parts of some cities to establish a domestic water supply station, are used bottled water supply.

"Water supply pipeline", commonly known as piping drinking water, water purification station was set up in residential and public buildings (hotels, offices, government agencies, etc.), the depth of the water further handling, processing and purification, the water pipe system in the original basis then add a separate high-quality drinking water supply pipes, the water delivered to the user, for residents drinkable.

Since many urban drinking water sources of reach Grade II surface water quality requirements, so in terms of the water companies, should first be pretreated or depth treatment to achieve the required effluent water quality requirements. Then gradually improve the water supply network and additional facilities (such as secondary water supply facilities, etc.), and finally to residential users of water are up to standard, according to The residents own needs, choose to drink unboiled water or drinking water.

Drinking Water Standards (2001) Ministry of Health issued the latest in a new water quality standards made it clear that drinking water, including drinking water and domestic water.
二、Quality of water supply situation
In recent years, the municipal water or ground water depth purification into drinkable water quality, direct supply millions of households, the real estate development in Guangdong, gradually become a trend. This practice of quality of water supply has become a real estate agent to enhance the quality of real estate is a major selling point, quickly extending from the new district to schools, offices, hotels and other units, even in public places. Pearl River Delta region have been completed only straight water pipe network projects over 300 units, 3.5 million to meet the nearly 800,000 residents to enjoy.

Residential quarters and public buildings (hotels, offices, government agencies, etc.) to install sub-quality water supply project, with investment period is short, quick recovery, profits and other characteristics. In Guangzhou, Shenzhen, Dongguan, developers installed in a 3000 resident set size of the area of water purification systems, with a total investment of more than three four million yuan, in addition to the engine power, the operating cost is minimal, profits are quite lucrative. Guangzhou City, the implementation of market pricing drinking water pipes, generally at about 0.3 yuan per liter, 1.18 yuan per ton, while the implementation of government pricing water price, nearly 300 times the difference between the two. Drinking water pipeline cost 0.08 yuan per liter, is priced at 0.3 yuan, an estimated two to three operators in a cell to recover construction costs.

Currently, many of the city's water supply in Guangdong has also collected from 1500 to 3000 yuan, ranging from initial installation fee to users, account fees, investment costs can be recovered in one fell swoop. Urban quality of water supply lucrative and stable returns, has attracted many companies involved, and even occupy the cell and into the real estate business interests reach agreement, in exchange for community access rights. Guangzhou dozen drinking water pipeline company, whose capital is mostly background research institutes, real estate companies and the private sector, they expect to undertake the project themselves into water operators.

Experts pointed out that in 1997 Shanghai Pudong district Jinhua pioneered the first cases of the water supply pipeline nationwide demonstration project after an intensive quality of water supply pipe, has become government support, social needs, large masses of attention to people's livelihood projects. One of the necessary conditions; the Ministry of Construction has organized 10 key cities nationwide pilot, quality of water supply and install selected engineering as & ldquo; national demonstration project & rdquo.

Guangdong has been in the lead in the quality of water supply network construction project was officially included in the province's economic and social development & ldquo; fifteen & rdquo; plan, proposed to invest 8.0 billion yuan, and actively promote the construction of & ldquo; PRD & rdquo; urban sub-district water supply network, plans to build a total size of daily water supply 50,000 tons. Fight in & ldquo; fifteen & rdquo; period, so that & ldquo; PRD & rdquo; regional urban residents can enjoy direct supply of high quality drinking water pipeline from the current 35 million to 10 million.

Experts pointed out that the total water supply in the city, only 10 percent of domestic water, including drinking water, as the city has only 10% of the residents, the town is the total amount of 1% of the water supply. To meet this 1% of the drinking water supply is used throughout purposes without asking, all water purification treatment after long-distance pipelines, water supply, etc. This way, water scarcity and pollution is very serious today economy, nor necessary. Quality of water supply by 1% of the water depth purification,And a separate pipe network directly supply households, both to meet the growing need for healthy drinking water, but also save the limited water resources. With urbanization and real estate around the large-scale development, completion of an area of rapid growth, quality of water supply has highlighted a huge space for development.

According to incomplete statistics, the country has more than 300 residence district of more than 150 million people drink water straight pipeline. Currently, in addition to Hunan, Guangdong, Daqing, Shanghai, the Beijing, Nanjing, Ningbo, Tianjin, Shijiazhuang, Xi'an, Chongqing, Shenyang, Harbin, Hainan, Fujian, Xinjiang and other places also start quality of water supply projects.