Tap water exists ever since indoor plumbing (also known as "running water"). That is, since the late 19th century. However, it only became avaiable to all persons in the mid 20th centuryThe provision of tap water requires a massive infrastructure of piping, pumps, and water purification works. The cost of tap water is a small fraction of that of bottled water, often as little as 0.01%.In most parts of the world, the same water supply that is used for drinking is also used for washing, flushing toilets (water closets), washing machines, and dishwashers. Experimental attempts have been made to introduce non-potable greywater or rainwater for these secondary uses.
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