running water vs tap water

[keannu]

Do you know the difference between "running water" and "tap water"? The former seems to be related to uncivilized houses.
3)Cave houses can have electricity, running water, and even the internet..

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[JMurray]

not a teacher

In this sort of context "running water" means water that is supplied to the dwelling by pipes, and so is usually synonymous with tap water.