There is a strong possibility that Delhi's potable water has got contaminated with toxic dyes after the immersion of idols on Durga Puja last week and earlier during the Ganesh festival.
"Many idols are immersed upstream in the Wazirabad area, from where Delhi gets its drinking water supply, and water treatment plants are not efficient enough to treat dyes and other chemicals," Ravi Aggarwal of NGO Toxics Link told IANS.