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Answer:Artision wells

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No water source is 100% certain to be pure. Surface water from run-of would likely be the most chancy. shallow groundwater next. At the other end of the scale deep groundwater (artesian wells etc.) and glacier derived water (because it represents water from rain/snow that fell several hundred years ago) is probably safest.

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Q: Which water source is LEAST likely to contain surface pollutants?
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