Dear Mr Sarma Actually stopping open defecation will not help in reducing water pollution, though it will help in reducing diseases, this is because merely collecting sewage and sending it to sewage treatment plants does not help. The technology available in 'modern' STPs does not remove nutrients, N and P, from sewage. So the nutrients will enter lakes and rivers, even after expensive treatment. Even in USA people are asking for solutions to remove nutrients from water - http://tulane.edu/tulaneprize/waterprize/the-problem.cfm

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Dear Mr Sarma Actually stopping open defecation will not help in reducing water pollution, though it will help in reducing diseases, this is because merely collecting sewage and sending it to sewage treatment plants does not help. The technology available in 'modern' STPs does not remove nutrients, N and P, from sewage. So the nutrients will enter lakes and rivers, even after expensive treatment. Even in USA people are asking for solutions to remove nutrients from water - http://tulane.edu/tulaneprize/waterprize/the-problem.cfm