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Martinager gravatar image
RedR

Further to the comment by Jagdish Barot I would point out that there are quality guidelines for irrigation water too - https://www.fao.org/DOCReP/003/T0234e/T0234e00.htm though generally lower water quality can be accepted than for drinking water. There is, of course, always the risk that irrigation water will also be drunk. The definitive guidelines of drinking water quality are published by the World Health Organisation. Both of these guidelines talk about a long list of potential contaminants and this is totally unrealistic in terms of field testing or small rural water supplies. Bangladesh probably has their own quality standards which may be based on the WHO guidelines but different in some details.

While the principal contaminants of concern have been discussed in the question and the other answers, one thing to consider before embarking on testing is the sustainability of the system and the ability (or otherwise) to rectify any problems that may be identified. While you may embark on a testing programme, this should be done with the local authorities (health/water) who may be required to carry it on in the future. Also consider how realistic it might be in the long term to either treat contaminated water or to stop people from using it.

Hope that this helps

Martin Ager