Residents of Prem Nagar colony in Loni area suffered from diarrhoea and complained of vomiting after drinking the water, sources said.
Sixty-one persons approached the Community Health Centre today, out of which nine were referred to the district hospital, a local health officer said.
In the last three days, several people of the area have come to the health centre with similar problems, he said.
Following which, the district authorities and municipal officials inspected Prem Nagar and other adjoining areas and ordered the immediate cleaning of water tanks.