Environmental factors
The local climatic variables that were included in this study
such asmonthlymeanmaximumtemperature (degreeCelsius),
monthly total rainfall (mm) and relative humidity at 1730 h IST
(%) were obtained from the records of Regional Meteorological
Department, Chennai for the period of January 2000 – December
2010. Private drinking water-supply information of Vellore City
was also collected from suppliers. The year of establishment
and their daily production in Liter were collected.