Although water in deep aquifers does not contain disease–causing bacteria, when public water supplies are drawn from ...

kellyagama on April 17 at 09:19PM

help i need an explaination this question has not

why is the answer d? if all the water is from the same quatifer and onlt 30/20 have chloreine,

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Emil-Kunkin on April 20 at 04:01PM

For a must be true, all we need is something that we can prove from the passage, even if it feels somewhat tangential to the point.

Here the last sentence tells us that all of the water met the standard, but some of the samples had more bacteria than others. This means that all the samples had some bacteria, and that they all met the standard. Therefore, the standard must allow for at least some bacteria.