What are the cause of Water scarcity?

.(i) Today in the modern world the number of industries increased and the industries conserve water in large amount to perform their different activities.
(ii) The industries require the high amount of hydroelectric power to run their large machines?
(ii) Ever the growing population were also the reason of water scarcity.
(iv) The industries also through their chemical waste in rivers, lakes, ponds, etc. which pollute the water and made unfit for human consumption.