Can drinking unboiled water cause any ilness️

 
The answer to your question depends on the quality of water in your region. Drinking water has many qualities including taste, smell, absence of microbes and absence of unwanted metals and minerals. In many regions, water is treated before it is supplied in the pipelines. This water may be consumed after passing it through a filter. Some regions may require water to be passed through an UV filter or boiled to kill any microbes. In some regions in the world the water can be consumed directly from the tap. The issue becomes more relevant in case the water is obtained from a well or bore well. If the water you get is free of microbes, there is no need to boil it. Boiling kills microbes. If you are sure of the quality of your water, you need not boil it. If not, boiling is a cheap, efficient and safe method of making the water free of infection-causing germs.