The Union Environment Ministry has published a draft notification that effectively prohibits users from installing membrane-based water purification, mainly reverse osmosis, systems in their homes if the water has been sourced from a supply that meets the Bureau of Indian Standards’ drinking water norms. 

The proposed regulation is not the final word and the Ministry will await comments from the public for 30 days, after which it may incorporate the changes before it becomes a law. The Delhi Jal Board, among others, claims that the water it supplies meets BIS norms. 

The Ministry has issued this order to comply with an order of the National Green Tribunal, which has prohibited the use of reverse osmosis (RO) purifiers in places where total dissolved solids (TDS) in the supplied water are below 500 mg per litre.

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