Water supply : A supply of water; specifically, water collected, as in reservoirs, and conveyed, as by pipes, for use in a city, mill, or the like.

Example:


Taxonomy
tariffs, water supply, service providers, developing countries, outbreak, pressure, regulatory agencies, water tariffs, developed countries, governance arrangements, cubic meter, consumption, water and sanitation, consumers, meter reading, service provision, water utilities, revenues.

Defination from the web:
... of the global population) had access to piped water supply through house connections. ... For more details on this topic, see water supply network. ... Water supply policies and regulation are usually defined by one or several Ministries, in consultation with the legislative branch. ...