New Delhi, Nov. 13 -- Several resident welfare associations (RWAs) in south Delhi have flagged "contaminated water supply" amid rising ammonia levels in Yamuna, disrupting water treatment and supply. They have reported increased concentrations of untreated waste and pollutants in water supplied by Delhi Jal Board. "The water smells like that of a gutter, and some residents have replaced water purifier filters and candles twice in a short span of time. Most of the residents are forced to buy bottled drinking water," said Greater Kailash-II RWA president, Sanjay Rana. B-1 Vasant Kunj RWA general secretary Aby Johnson flagged similar concerns. "Water supply is normal as of now, but quality is poor. We can't trust the water we are drinking even...