Tap water is potable water supplied to a tap (valve) inside the household or workplace. It is a principal
component of "indoor plumbing", which became available in urban areas of the developed world during the last quarter of the 19th century,
and common during the mid-20th century. The application of technologies
involved in providing clean (potable) water to homes, businesses and public
buildings is a major subfield of sanitary
engineering. Calling
potable water "tap water" distinguishes it from the other main types
of potable water, such as water from rainwater-collecting cisterns, from village pumps (town pumps), or from streams,
rivers, or lakes (whose potability varies).
By wikipedia.
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