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| | Water supply network - Wikipedia, the free encyclopedia |
 | | Virtually all large systems must treat the water; a fact that is tighly regulated by global, state and federal agencies, such as the World Health Organization (WHO) or the Environmental Protection Agency (EPA). |
 | | That energy is transferred to the water, therefore becoming water pressure, in a number of ways: by a pump, by gravity feed from a water source (such as a reservoir or a water tower) at a higher elevation, or, in smaller systems, by compressed air. |
 | | These systems are usually owned and maintained by local governments, such as cities, or other public entities, but are occasionally operated by a commercial enterprise (see water privatization). |
| en.wikipedia.org /wiki/Municipal_water_system (646 words) |
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