<P> In West Bengal , India , water is mostly supplied from rivers . Groundwater comes from deep tubewells , which are few in number . Because of the low quantity of deep tubewells , the risk of arsenic poisoning in West Bengal is comparatively less . According to the World Health Organisation , `` In Bangladesh , West Bengal ( India ) , and some other areas most drinking - water used to be collected from open dug wells and ponds with little or no arsenic , but with contaminated water transmitting diseases such as diarrhoea , dysentery , typhoid , cholera , and hepatitis . Programmes to provide ' safe ' drinking - water over the past 30 years have helped to control these diseases , but in some areas they have had the unexpected side - effect of exposing the population to another health problem -- arsenic . '' The acceptable level as defined by WHO for maximum concentrations of arsenic in safe drinking water is 0.01 mg / L. The Bangladesh government 's standard is a fivefold greater rate , with 0.05 mg / L being considered safe . WHO has defined the areas under threat : Seven of the twenty districts of West Bengal have been reported to have ground water arsenic concentrations above 0.05 mg / L. The total population in these seven districts is over 34 million while the number using arsenic - rich water is more than 1 million ( above 0.05 mg / L ) . That number increases to 1.3 million when the concentration is above 0.01 mg / L. According to a British Geological Survey study in 1998 on shallow tube - wells in 61 of the 64 districts in Bangladesh , 46 percent of the samples were above 0.01 mg / L and 27 percent were above 0.050 mg / L. When combined with the estimated 1999 population , it was estimated that the number of people exposed to arsenic concentrations above 0.05 mg / L is 28 - 35 million and the number of those exposed to more than 0.01 mg / L is 46 - 57 million ( BGS , 2000 ) . </P>
<P> In West Bengal , India , water is mostly supplied from rivers . Groundwater comes from deep tubewells , which are few in number . Because of the low quantity of deep tubewells , the risk of arsenic poisoning in West Bengal is comparatively less . According to the World Health Organisation , `` In Bangladesh , West Bengal ( India ) , and some other areas most drinking - water used to be collected from open dug wells and ponds with little or no arsenic , but with contaminated water transmitting diseases such as diarrhoea , dysentery , typhoid , cholera , and hepatitis . Programmes to provide ' safe ' drinking - water over the past 30 years have helped to control these diseases , but in some areas they have had the unexpected side - effect of exposing the population to another health problem -- arsenic . '' The acceptable level as defined by WHO for maximum concentrations of arsenic in safe drinking water is 0.01 mg / L. The Bangladesh government 's standard is a fivefold greater rate , with 0.05 mg / L being considered safe . WHO has defined the areas under threat : Seven of the twenty districts of West Bengal have been reported to have ground water arsenic concentrations above 0.05 mg / L. The total population in these seven districts is over 34 million while the number using arsenic - rich water is more than 1 million ( above 0.05 mg / L ) . That number increases to 1.3 million when the concentration is above 0.01 mg / L. According to a British Geological Survey study in 1998 on shallow tube - wells in 61 of the 64 districts in Bangladesh , 46 percent of the samples were above 0.01 mg / L and 27 percent were above 0.050 mg / L. When combined with the estimated 1999 population , it was estimated that the number of people exposed to arsenic concentrations above 0.05 mg / L is 28 - 35 million and the number of those exposed to more than 0.01 mg / L is 46 - 57 million ( BGS , 2000 ) . </P>
problem of water pollution with arsenic is maximum in which state of india
problem of water pollution with arsenic is maximum in which state of india
West Bengal
West Bengal