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To compare the stringency of federal regulations of bottled water and “big city” tap water, note the following:City tap water must be tested 100 or more times a month; bottled water plants must test for coliform bacteria once a week.City tap water must meet standards for certain important toxic or cancer-causing chemicals such as phthalate (a chemical that can leach from plastic, including plastic bottles); bottled water is exempt from regulation regarding these chemicals.Cities generally must test at least once a quarter for many chemical contaminants; bottled water manufactures generally must test only annually.Tap water test results and notices of violations must be reported to state or federal officials; there is no mandatory reporting for bottled water manufacturers.City water systems must issue annual “right-to-know” reports telling consumers what is in their water; bottled water manufacturers are not subject to such annual consumer reports. You may have come across the word artesian well as you search for borehole information for your business or property. Well, an artesian well is groundwater like other forms of underground waters but the difference is the way in which it gets to the surface. With an artesian well, it does not require a pump for the water to raise and reach the  surface. Through natural pressure from the underground, the water is able to rise from the aquifer and reach the surface.

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When we extract the gorundwater we get pure water because when the rail falls,it gets collected over non-porous rocks and we extract groundwater form there only.So we get pure water from extracting groundwater.But when we extract too much water from ground it leads to overextraction and as a result it leads to lowering of water table and contamination of groundwater.
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