Once polluted by industry, groundwater is very difficult to clean up. This is the lesson learnt from the Bichhri experience. Situated about 12 km from Udaipur, the groundwater of Bichhri, spread over an area of 300 hectares, is stark red. And as the groundwater moves naturally to other aquifers, it pollutes that water as well. Seventy wells used by some 10,000 residents have been rendered completely useless, and the 22 villages are without any drinking water now. In 1983, an H-acid manufacturing unit ruined the groundwater