In most developed nations drinking water is piped to homes and is available on tap. Usually it is safe water.

The 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 a ten-thousandth.

The same water supply that is used for drinking is also used for washing, flushing water closets (toilets), washing machines, and dishwashers. Experimental attempts have been made to introduce non-potable greywater or rainwater for these secondary uses.

In many areas, fluoride is added to the tap water as a means to improve public dental health. This remains a controversial issue in terms of the health, freedoms and rights of the individual.

The availability of clean tap water brings major public health benefits. Usually, the same administration that provides tap water is also responsible for the removal and treatment before
discharge or reclamation of wastewater.

Tap water generally comes with 3 to 5 bars.