Tap water may contain bacteria and viruses that can make you sick. To be on the safe side you should boil the water before drinking it. Some special filters can also be bought to filter out small particles and bacteria. Alternatively you can use waterguard to treat the water. You can also get your water tested and see the general quality of your water but this may change according to season because ground water levels change in the rainy season. I suggest you always boil your water before drinking to be on the safe side.