Causes: _ Water pollution caused by sewage and garbage + The water pollution situation in the municipality, sewage, garbage disposal system, no focus that directly discharge source reception (River, Lake, Canal, ditch). On the other hand, there are many production facilities do not waste water, most hospitals and large health facilities yet have waste water treatment system, a large amount of solid waste in the city not picked out ... is the important source of water sources pollution caused. On the State of water pollution in rural and agricultural areas, at present in our country has nearly 76% of the population are living in rural areas where infrastructure is still backward, the greater part of the waste of human and cattle are not handled should seep down to earth or being washed , make the water source pollution in terms of organic and microorganism._ Water pollution caused by the production process + Manufacturing process here consists of the process of agricultural production and industrial manufacturing process. ~ Agricultural production process: in the agricultural production process, people often use pesticides, chemical fertilizer, agricultural production process lasts and goes to Earth to pollute soil and water sources. Besides livestock, farm system, goats, sheep ... very developed but grazing methods back freedom, lack of planning. Therefore, the ability to pollute water supplies from chemicals in fertilizers, plant protection drugs, waste from livestock farms are very high. ~ Industrial production processes: currently in VN, waste water from industrial production activities, most are direct emissions sources and concentrations of substances are exceeded standard allows for many times.
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