Former Union Minister and Congress leader Jagdish Tytler has accused the BJP Government in Delhi of supplying "filthy and untreated water" to the Capital's residents and said it would be a major issue for his party in the Delhi Assembly polls stated for later this year".The water issue was sparked off by a report by scientists at AIIMS which found an "alarming" prevalence of various disease-causing amoeba, bacteria, parasites, and larvae of insects in drinking water supplied in Delhi.