In terms of comparing nations with plumbing to those without, then yes plumbing has improved the quality and cleanliness of drinking water due to its ability to travel lengthy distances from filtration plants without much contamination.
However, plumbing does have an adverse effect, in terms of how the plumbing is done: According to SafePlumbing, most homes before 1980 have lead solder connecting pipes, and thus increases the amount of lead in the water, which has adverse health effects on the drinker.
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