The largest percentage of waste water (600,000 m3 per day, with about 250 tons of waste is discharged in the river area of Hanoi) and industrial (260,000 m3 and only 10% is processed) are not treated of which flow directly into the lake, then flows out the major rivers in the Red River Delta and Mekong River. In addition, many factories and production facilities as abattoirs and even hospitals (7,000 m3 per day, and only 30% is being processed) is not equipped with effluent treatment systems. Concentration BOD and COD3 beyond permissible limits 1-3 times; concentration of ammonia and some toxic substances arising from industrial activity and agriculture has reached 5-10 times the permissible standards. Usages direct discharge of wastes (from humans, cattle and poultry) in the water source residents also make the surface water in the area has a high level of microbiological contamination. The fish in the river raft with waste over 3 million tons / year is the source of water pollution significantly. The development of aquaculture also contaminate the growing scale. Environmental pollution in local aquaculture zones occur relatively common. During the culture, the culture in pond water discharged into rivers and canals. The larger the amount of fish and shrimp as much waste, sewage, manure slurry of aquatic products, leftovers, residues of materials used in livestock farming from being discharged into rivers where pollutant High infection. The high-tech farming, such as intensive farming density, industry, the greater the emissions source, adverse effects on the ecosystem. Faced with contaminated water, many water supply schemes are invested but not enough to serve people. A series of rural water supply schemes serving size 50-100 massively born households. The problem now is worrisome water supply stations are using groundwater resources that groundwater resources are being exhausted quickly. Typically, in Can Tho, the estimated annual groundwater level dropped by 0.5 m, even in some places up to 0.7m. The forecast, in the next 5-10 years, if the underground water sources continue to be exploited excessive, will no groundwater to the pumping station provided for the people.
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