For what purpose borewell water is not used?

Bore well water is brackish water, so it is not suitable for cooking or drinking. Drinking or cooking using borewell water can result in dangerous ailments. Borewell water contains toxic metals such as arsenic, fluoride, and lead which cause hardness in borewell water. Arsenic is the most toxic heavy metal that can cause health issues for the human body. People use borewell water for washing and gardening purposes and will not use it for cooking.